Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

25 files changed, 2781 insertions, 0 deletions

diff --git a/intl/locale/tests/LangPackMatcherTestUtils.sys.mjs b/intl/locale/tests/LangPackMatcherTestUtils.sys.mjs
new file mode 100644
index 0000000000..4b18f1be13
--- /dev/null
+++ b/intl/locale/tests/LangPackMatcherTestUtils.sys.mjs
@@ -0,0 +1,124 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import { LangPackMatcher } from "resource://gre/modules/LangPackMatcher.sys.mjs";
+
+/**
+ * LangPackMatcher.jsm calls out to to the addons store, which involves network requests.
+ * Other tests create a fake addons server, and install mock XPIs. At the time of this
+ * writing that infrastructure is not available for mochitests.
+ *
+ * Instead, this test mocks out APIs that have a side-effect, so the addons of the browser
+ * are never modified.
+ *
+ * The calls to get the app's locale and system's locale are also mocked so that the
+ * different language mismatch scenarios can be run through.
+ *
+ * The locales are BCP 47 identifiers:
+ *
+ * @param {{
+ *   sandbox: SinonSandbox,
+ *   systemLocale: string,
+ *   appLocale, string,
+ * }}
+ */
+export function getAddonAndLocalAPIsMocker(testScope, sandbox) {
+  const { info } = testScope;
+  return function mockAddonAndLocaleAPIs({ systemLocale, appLocale }) {
+    info("Mocking LangPackMatcher.jsm APIs");
+
+    let resolveLangPacks;
+    const langPackPromise = new Promise(resolve => {
+      resolveLangPacks = availableLangpacks => {
+        info(
+          `Resolving which langpacks are available for download: ${JSON.stringify(
+            availableLangpacks
+          )}`
+        );
+        resolve(
+          availableLangpacks.map(locale => ({
+            guid: `langpack-${locale}@firefox.mozilla.org`,
+            type: "language",
+            hash: locale,
+            target_locale: locale,
+            current_compatible_version: {
+              files: [
+                {
+                  platform: "all",
+                  url: `http://example.com/${locale}.langpack.xpi`,
+                },
+              ],
+            },
+          }))
+        );
+      };
+    });
+
+    let resolveInstaller;
+    const installerPromise = new Promise(resolve => {
+      resolveInstaller = () => {
+        info("LangPack install finished.");
+        resolve();
+      };
+    });
+
+    const { mockable } = LangPackMatcher;
+    if (appLocale) {
+      const availableLocales = [appLocale];
+      if (appLocale !== "en-US") {
+        // Ensure the fallback behavior is accurately simulated for Firefox.
+        availableLocales.push("en-US");
+      }
+      sandbox
+        .stub(mockable, "getAvailableLocalesIncludingFallback")
+        .returns(availableLocales);
+      sandbox.stub(mockable, "getDefaultLocale").returns(appLocale);
+      sandbox.stub(mockable, "getAppLocaleAsBCP47").returns(appLocale);
+      sandbox.stub(mockable, "getLastFallbackLocale").returns("en-US");
+    }
+    if (systemLocale) {
+      sandbox.stub(mockable, "getSystemLocale").returns(systemLocale);
+    }
+
+    sandbox.stub(mockable, "getAvailableLangpacks").callsFake(() => {
+      info("Requesting which langpacks are available for download");
+      return langPackPromise;
+    });
+
+    sandbox.stub(mockable, "installLangPack").callsFake(langPack => {
+      info(`LangPack install started, but pending: ${langPack.target_locale}`);
+      return installerPromise;
+    });
+
+    sandbox.stub(mockable, "setRequestedAppLocales").callsFake(locales => {
+      info(
+        `Changing the browser's requested locales to: ${JSON.stringify(
+          locales
+        )}`
+      );
+    });
+
+    return {
+      /**
+       * Resolves the addons API call with available langpacks. Call with a list
+       * of BCP 47 identifiers.
+       *
+       * @type {(availableLangpacks: string[]) => {}}
+       */
+      resolveLangPacks,
+
+      /**
+       * Resolves the pending call to install a langpack.
+       *
+       * @type {() => {}}
+       */
+      resolveInstaller,
+
+      /**
+       * The mocked APIs.
+       */
+      mockable,
+    };
+  };
+}
diff --git a/intl/locale/tests/gtest/TestAppDateTimeFormat.cpp b/intl/locale/tests/gtest/TestAppDateTimeFormat.cpp
new file mode 100644
index 0000000000..a83b373428
--- /dev/null
+++ b/intl/locale/tests/gtest/TestAppDateTimeFormat.cpp
@@ -0,0 +1,310 @@
+#include "gtest/gtest.h"
+#include "mozilla/gtest/MozAssertions.h"
+#include "mozilla/intl/AppDateTimeFormat.h"
+#include "mozilla/intl/DateTimeFormat.h"
+
+namespace mozilla::intl {
+using Style = DateTimeFormat::Style;
+using StyleBag = DateTimeFormat::StyleBag;
+using ComponentsBag = DateTimeFormat::ComponentsBag;
+
+static DateTimeFormat::StyleBag ToStyleBag(Maybe<DateTimeFormat::Style> date,
+                                           Maybe<DateTimeFormat::Style> time) {
+  DateTimeFormat::StyleBag style;
+  style.date = date;
+  style.time = time;
+  return style;
+}
+
+TEST(AppDateTimeFormat, FormatPRExplodedTime)
+{
+  PRTime prTime = 0;
+  PRExplodedTime prExplodedTime;
+  PR_ExplodeTime(prTime, PR_GMTParameters, &prExplodedTime);
+
+  AppDateTimeFormat::sLocale = new nsCString("en-US");
+  AppDateTimeFormat::DeleteCache();
+  StyleBag style = ToStyleBag(Some(Style::Long), Some(Style::Long));
+
+  nsAutoString formattedTime;
+  nsresult rv =
+      AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"January") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1970") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"12:00:00 AM") != kNotFound ||
+              formattedTime.Find(u"12:00:00\u202FAM") != kNotFound ||
+              formattedTime.Find(u"00:00:00") != kNotFound);
+
+  prExplodedTime = {0, 0, 19, 0, 1, 0, 1970, 4, 0, {(19 * 60), 0}};
+
+  rv = AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"January") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1970") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"12:19:00 AM") != kNotFound ||
+              formattedTime.Find(u"12:19:00\u202FAM") != kNotFound ||
+              formattedTime.Find(u"00:19:00") != kNotFound);
+
+  prExplodedTime = {0, 0,    0, 7, 1,
+                    0, 1970, 4, 0, {(6 * 60 * 60), (1 * 60 * 60)}};
+  rv = AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"January") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1970") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"7:00:00 AM") != kNotFound ||
+              formattedTime.Find(u"7:00:00\u202FAM") != kNotFound ||
+              formattedTime.Find(u"07:00:00") != kNotFound);
+
+  prExplodedTime = {
+      0, 0,    29, 11, 1,
+      0, 1970, 4,  0,  {(10 * 60 * 60) + (29 * 60), (1 * 60 * 60)}};
+  rv = AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"January") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1970") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"11:29:00 AM") != kNotFound ||
+              formattedTime.Find(u"11:29:00\u202FAM") != kNotFound ||
+              formattedTime.Find(u"11:29:00") != kNotFound);
+
+  prExplodedTime = {0, 0, 37, 23, 31, 11, 1969, 3, 364, {-(23 * 60), 0}};
+  rv = AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"December") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"31") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1969") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"11:37:00 PM") != kNotFound ||
+              formattedTime.Find(u"11:37:00\u202FPM") != kNotFound ||
+              formattedTime.Find(u"23:37:00") != kNotFound);
+
+  prExplodedTime = {0, 0, 0, 17, 31, 11, 1969, 3, 364, {-(7 * 60 * 60), 0}};
+  rv = AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"December") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"31") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1969") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"5:00:00 PM") != kNotFound ||
+              formattedTime.Find(u"5:00:00\u202FPM") != kNotFound ||
+              formattedTime.Find(u"17:00:00") != kNotFound);
+
+  prExplodedTime = {
+      0,  0,    47, 14,  31,
+      11, 1969, 3,  364, {-((10 * 60 * 60) + (13 * 60)), (1 * 60 * 60)}};
+  rv = AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"December") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"31") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1969") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"2:47:00 PM") != kNotFound ||
+              formattedTime.Find(u"2:47:00\u202FPM") != kNotFound ||
+              formattedTime.Find(u"14:47:00") != kNotFound);
+}
+
+TEST(AppDateTimeFormat, DateFormatSelectors)
+{
+  PRTime prTime = 0;
+  PRExplodedTime prExplodedTime;
+  PR_ExplodeTime(prTime, PR_GMTParameters, &prExplodedTime);
+
+  AppDateTimeFormat::sLocale = new nsCString("en-US");
+  AppDateTimeFormat::DeleteCache();
+
+  nsAutoString formattedTime;
+
+  {
+    ComponentsBag components{};
+    components.year = Some(DateTimeFormat::Numeric::Numeric);
+    components.month = Some(DateTimeFormat::Month::TwoDigit);
+
+    nsresult rv =
+        AppDateTimeFormat::Format(components, &prExplodedTime, formattedTime);
+    ASSERT_NS_SUCCEEDED(rv);
+    ASSERT_STREQ("01/1970", NS_ConvertUTF16toUTF8(formattedTime).get());
+  }
+  {
+    ComponentsBag components{};
+    components.year = Some(DateTimeFormat::Numeric::Numeric);
+    components.month = Some(DateTimeFormat::Month::Long);
+
+    nsresult rv =
+        AppDateTimeFormat::Format(components, &prExplodedTime, formattedTime);
+    ASSERT_NS_SUCCEEDED(rv);
+    ASSERT_STREQ("January 1970", NS_ConvertUTF16toUTF8(formattedTime).get());
+  }
+  {
+    ComponentsBag components{};
+    components.month = Some(DateTimeFormat::Month::Long);
+
+    nsresult rv =
+        AppDateTimeFormat::Format(components, &prExplodedTime, formattedTime);
+    ASSERT_NS_SUCCEEDED(rv);
+    ASSERT_STREQ("January", NS_ConvertUTF16toUTF8(formattedTime).get());
+  }
+  {
+    ComponentsBag components{};
+    components.weekday = Some(DateTimeFormat::Text::Short);
+
+    nsresult rv =
+        AppDateTimeFormat::Format(components, &prExplodedTime, formattedTime);
+    ASSERT_NS_SUCCEEDED(rv);
+    ASSERT_STREQ("Thu", NS_ConvertUTF16toUTF8(formattedTime).get());
+  }
+}
+
+TEST(AppDateTimeFormat, FormatPRExplodedTimeForeign)
+{
+  PRTime prTime = 0;
+  PRExplodedTime prExplodedTime;
+  PR_ExplodeTime(prTime, PR_GMTParameters, &prExplodedTime);
+
+  AppDateTimeFormat::sLocale = new nsCString("de-DE");
+  AppDateTimeFormat::DeleteCache();
+  StyleBag style = ToStyleBag(Some(Style::Long), Some(Style::Long));
+
+  nsAutoString formattedTime;
+  nsresult rv =
+      AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"1.") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"Januar") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1970") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"12:00:00 AM") != kNotFound ||
+              formattedTime.Find(u"12:00:00\u202FAM") != kNotFound ||
+              formattedTime.Find(u"00:00:00") != kNotFound);
+
+  prExplodedTime = {0, 0, 19, 0, 1, 0, 1970, 4, 0, {(19 * 60), 0}};
+  rv = AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"1.") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"Januar") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1970") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"12:19:00 AM") != kNotFound ||
+              formattedTime.Find(u"12:19:00\u202FAM") != kNotFound ||
+              formattedTime.Find(u"00:19:00") != kNotFound);
+
+  prExplodedTime = {0, 0,    0, 7, 1,
+                    0, 1970, 4, 0, {(6 * 60 * 60), (1 * 60 * 60)}};
+  rv = AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"1.") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"Januar") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1970") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"7:00:00 AM") != kNotFound ||
+              formattedTime.Find(u"7:00:00\u202FAM") != kNotFound ||
+              formattedTime.Find(u"07:00:00") != kNotFound);
+
+  prExplodedTime = {
+      0, 0,    29, 11, 1,
+      0, 1970, 4,  0,  {(10 * 60 * 60) + (29 * 60), (1 * 60 * 60)}};
+  rv = AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"1.") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"Januar") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1970") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"11:29:00 AM") != kNotFound ||
+              formattedTime.Find(u"11:29:00\u202FAM") != kNotFound ||
+              formattedTime.Find(u"11:29:00") != kNotFound);
+
+  prExplodedTime = {0, 0, 37, 23, 31, 11, 1969, 3, 364, {-(23 * 60), 0}};
+  rv = AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"31.") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"Dezember") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1969") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"11:37:00 PM") != kNotFound ||
+              formattedTime.Find(u"11:37:00\u202FPM") != kNotFound ||
+              formattedTime.Find(u"23:37:00") != kNotFound);
+
+  prExplodedTime = {0, 0, 0, 17, 31, 11, 1969, 3, 364, {-(7 * 60 * 60), 0}};
+  rv = AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"31.") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"Dezember") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1969") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"5:00:00 PM") != kNotFound ||
+              formattedTime.Find(u"5:00:00\u202FPM") != kNotFound ||
+              formattedTime.Find(u"17:00:00") != kNotFound);
+
+  prExplodedTime = {
+      0,  0,    47, 14,  31,
+      11, 1969, 3,  364, {-((10 * 60 * 60) + (13 * 60)), (1 * 60 * 60)}};
+  rv = AppDateTimeFormat::Format(style, &prExplodedTime, formattedTime);
+  ASSERT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(formattedTime.Find(u"31.") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"Dezember") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"1969") != kNotFound);
+  ASSERT_TRUE(formattedTime.Find(u"2:47:00 PM") != kNotFound ||
+              formattedTime.Find(u"2:47:00\u202FPM") != kNotFound ||
+              formattedTime.Find(u"14:47:00") != kNotFound);
+}
+
+TEST(AppDateTimeFormat, DateFormatSelectorsForeign)
+{
+  PRTime prTime = 0;
+  PRExplodedTime prExplodedTime;
+  PR_ExplodeTime(prTime, PR_GMTParameters, &prExplodedTime);
+
+  AppDateTimeFormat::sLocale = new nsCString("de-DE");
+  AppDateTimeFormat::DeleteCache();
+
+  nsAutoString formattedTime;
+  {
+    ComponentsBag components{};
+    components.year = Some(DateTimeFormat::Numeric::Numeric);
+    components.month = Some(DateTimeFormat::Month::TwoDigit);
+
+    nsresult rv =
+        AppDateTimeFormat::Format(components, &prExplodedTime, formattedTime);
+    ASSERT_NS_SUCCEEDED(rv);
+    ASSERT_STREQ("01.1970", NS_ConvertUTF16toUTF8(formattedTime).get());
+  }
+  {
+    ComponentsBag components{};
+    components.year = Some(DateTimeFormat::Numeric::Numeric);
+    components.month = Some(DateTimeFormat::Month::Long);
+
+    nsresult rv =
+        AppDateTimeFormat::Format(components, &prExplodedTime, formattedTime);
+    ASSERT_NS_SUCCEEDED(rv);
+    ASSERT_STREQ("Januar 1970", NS_ConvertUTF16toUTF8(formattedTime).get());
+  }
+  {
+    ComponentsBag components{};
+    components.weekday = Some(DateTimeFormat::Text::Short);
+
+    nsresult rv =
+        AppDateTimeFormat::Format(components, &prExplodedTime, formattedTime);
+    ASSERT_NS_SUCCEEDED(rv);
+    ASSERT_STREQ("Do", NS_ConvertUTF16toUTF8(formattedTime).get());
+  }
+  {
+    ComponentsBag components{};
+    components.weekday = Some(DateTimeFormat::Text::Long);
+
+    nsresult rv =
+        AppDateTimeFormat::Format(components, &prExplodedTime, formattedTime);
+    ASSERT_NS_SUCCEEDED(rv);
+    ASSERT_STREQ("Donnerstag", NS_ConvertUTF16toUTF8(formattedTime).get());
+  }
+  {
+    ComponentsBag components{};
+    components.month = Some(DateTimeFormat::Month::Long);
+
+    nsresult rv =
+        AppDateTimeFormat::Format(components, &prExplodedTime, formattedTime);
+    ASSERT_NS_SUCCEEDED(rv);
+    ASSERT_STREQ("Januar", NS_ConvertUTF16toUTF8(formattedTime).get());
+  }
+  {
+    ComponentsBag components{};
+    components.weekday = Some(DateTimeFormat::Text::Short);
+
+    nsresult rv =
+        AppDateTimeFormat::Format(components, &prExplodedTime, formattedTime);
+    ASSERT_NS_SUCCEEDED(rv);
+    ASSERT_STREQ("Do", NS_ConvertUTF16toUTF8(formattedTime).get());
+  }
+}
+
+}  // namespace mozilla::intl
diff --git a/intl/locale/tests/gtest/TestLocaleService.cpp b/intl/locale/tests/gtest/TestLocaleService.cpp
new file mode 100644
index 0000000000..2cf19727d6
--- /dev/null
+++ b/intl/locale/tests/gtest/TestLocaleService.cpp
@@ -0,0 +1,173 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/intl/Locale.h"
+#include "mozilla/intl/LocaleService.h"
+#include "mozilla/intl/Collator.h"
+
+using namespace mozilla::intl;
+
+TEST(Intl_Locale_LocaleService, CanonicalizeLanguageId)
+{
+  nsCString locale("en-US.POSIX");
+  ASSERT_TRUE(LocaleService::CanonicalizeLanguageId(locale));
+  ASSERT_TRUE(locale.EqualsLiteral("en-US"));
+
+  locale.AssignLiteral("en-US_POSIX");
+  ASSERT_TRUE(LocaleService::CanonicalizeLanguageId(locale));
+  ASSERT_TRUE(locale.EqualsLiteral("en-US-posix"));
+
+  locale.AssignLiteral("en-US-POSIX");
+  ASSERT_TRUE(LocaleService::CanonicalizeLanguageId(locale));
+  ASSERT_TRUE(locale.EqualsLiteral("en-US-posix"));
+
+  locale.AssignLiteral("C");
+  ASSERT_FALSE(LocaleService::CanonicalizeLanguageId(locale));
+  ASSERT_TRUE(locale.EqualsLiteral("und"));
+
+  locale.AssignLiteral("");
+  ASSERT_FALSE(LocaleService::CanonicalizeLanguageId(locale));
+  ASSERT_TRUE(locale.EqualsLiteral("und"));
+}
+
+TEST(Intl_Locale_LocaleService, GetAppLocalesAsBCP47)
+{
+  nsTArray<nsCString> appLocales;
+  LocaleService::GetInstance()->GetAppLocalesAsBCP47(appLocales);
+
+  ASSERT_FALSE(appLocales.IsEmpty());
+}
+
+TEST(Intl_Locale_LocaleService, GetAppLocalesAsLangTags)
+{
+  nsTArray<nsCString> appLocales;
+  LocaleService::GetInstance()->GetAppLocalesAsLangTags(appLocales);
+
+  ASSERT_FALSE(appLocales.IsEmpty());
+}
+
+TEST(Intl_Locale_LocaleService, GetAppLocalesAsLangTags_lastIsPresent)
+{
+  nsAutoCString lastFallbackLocale;
+  LocaleService::GetInstance()->GetLastFallbackLocale(lastFallbackLocale);
+
+  nsTArray<nsCString> appLocales;
+  LocaleService::GetInstance()->GetAppLocalesAsLangTags(appLocales);
+
+  ASSERT_TRUE(appLocales.Contains(lastFallbackLocale));
+}
+
+TEST(Intl_Locale_LocaleService, GetAppLocaleAsLangTag)
+{
+  nsTArray<nsCString> appLocales;
+  LocaleService::GetInstance()->GetAppLocalesAsLangTags(appLocales);
+
+  nsAutoCString locale;
+  LocaleService::GetInstance()->GetAppLocaleAsLangTag(locale);
+
+  ASSERT_TRUE(appLocales[0] == locale);
+}
+
+TEST(Intl_Locale_LocaleService, GetRegionalPrefsLocales)
+{
+  nsTArray<nsCString> rpLocales;
+  LocaleService::GetInstance()->GetRegionalPrefsLocales(rpLocales);
+
+  int32_t len = rpLocales.Length();
+  ASSERT_TRUE(len > 0);
+}
+
+TEST(Intl_Locale_LocaleService, GetWebExposedLocales)
+{
+  const nsTArray<nsCString> spoofLocale{"de"_ns};
+  LocaleService::GetInstance()->SetAvailableLocales(spoofLocale);
+  LocaleService::GetInstance()->SetRequestedLocales(spoofLocale);
+
+  nsTArray<nsCString> pvLocales;
+
+  mozilla::Preferences::SetInt("privacy.spoof_english", 0);
+  LocaleService::GetInstance()->GetWebExposedLocales(pvLocales);
+  ASSERT_TRUE(pvLocales.Length() > 0);
+  ASSERT_TRUE(pvLocales[0].Equals("de"_ns));
+
+  mozilla::Preferences::SetCString("intl.locale.privacy.web_exposed", "zh-TW");
+  LocaleService::GetInstance()->GetWebExposedLocales(pvLocales);
+  ASSERT_TRUE(pvLocales.Length() > 0);
+  ASSERT_TRUE(pvLocales[0].Equals("zh-TW"_ns));
+
+  mozilla::Preferences::SetInt("privacy.spoof_english", 2);
+  LocaleService::GetInstance()->GetWebExposedLocales(pvLocales);
+  ASSERT_EQ(1u, pvLocales.Length());
+  ASSERT_TRUE(pvLocales[0].Equals("en-US"_ns));
+}
+
+TEST(Intl_Locale_LocaleService, GetRequestedLocales)
+{
+  nsTArray<nsCString> reqLocales;
+  LocaleService::GetInstance()->GetRequestedLocales(reqLocales);
+
+  int32_t len = reqLocales.Length();
+  ASSERT_TRUE(len > 0);
+}
+
+TEST(Intl_Locale_LocaleService, GetAvailableLocales)
+{
+  nsTArray<nsCString> availableLocales;
+  LocaleService::GetInstance()->GetAvailableLocales(availableLocales);
+
+  int32_t len = availableLocales.Length();
+  ASSERT_TRUE(len > 0);
+}
+
+TEST(Intl_Locale_LocaleService, GetPackagedLocales)
+{
+  nsTArray<nsCString> packagedLocales;
+  LocaleService::GetInstance()->GetPackagedLocales(packagedLocales);
+
+  int32_t len = packagedLocales.Length();
+  ASSERT_TRUE(len > 0);
+}
+
+TEST(Intl_Locale_LocaleService, GetDefaultLocale)
+{
+  nsAutoCString locStr;
+  LocaleService::GetInstance()->GetDefaultLocale(locStr);
+
+  ASSERT_FALSE(locStr.IsEmpty());
+  Locale loc;
+  ASSERT_TRUE(LocaleParser::TryParse(locStr, loc).isOk());
+}
+
+TEST(Intl_Locale_LocaleService, IsAppLocaleRTL)
+{
+  mozilla::Preferences::SetCString("intl.l10n.pseudo", "bidi");
+  ASSERT_TRUE(LocaleService::GetInstance()->IsAppLocaleRTL());
+  mozilla::Preferences::ClearUser("intl.l10n.pseudo");
+}
+
+TEST(Intl_Locale_LocaleService, TryCreateComponent)
+{
+  {
+    // Create a Collator with the app locale.
+    auto result = LocaleService::GetInstance()->TryCreateComponent<Collator>();
+    ASSERT_TRUE(result.isOk());
+  }
+  {
+    // Create a Collator with the "en" locale.
+    auto result =
+        LocaleService::GetInstance()->TryCreateComponentWithLocale<Collator>(
+            "en");
+    ASSERT_TRUE(result.isOk());
+  }
+  {
+    // Fallback to the app locale when an invalid one is used.
+    auto result =
+        LocaleService::GetInstance()->TryCreateComponentWithLocale<Collator>(
+            "$invalidName");
+    ASSERT_TRUE(result.isOk());
+  }
+}
diff --git a/intl/locale/tests/gtest/TestLocaleServiceNegotiate.cpp b/intl/locale/tests/gtest/TestLocaleServiceNegotiate.cpp
new file mode 100644
index 0000000000..c428e81c8d
--- /dev/null
+++ b/intl/locale/tests/gtest/TestLocaleServiceNegotiate.cpp
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "mozilla/intl/LocaleService.h"
+
+using namespace mozilla::intl;
+
+TEST(Intl_Locale_LocaleService, Negotiate)
+{
+  nsTArray<nsCString> requestedLocales;
+  nsTArray<nsCString> availableLocales;
+  nsTArray<nsCString> supportedLocales;
+  nsAutoCString defaultLocale("en-US");
+  int32_t strategy = LocaleService::kLangNegStrategyFiltering;
+
+  requestedLocales.AppendElement("sr"_ns);
+
+  availableLocales.AppendElement("sr-Cyrl"_ns);
+  availableLocales.AppendElement("sr-Latn"_ns);
+
+  LocaleService::GetInstance()->NegotiateLanguages(
+      requestedLocales, availableLocales, defaultLocale, strategy,
+      supportedLocales);
+
+  ASSERT_TRUE(supportedLocales.Length() == 2);
+  ASSERT_TRUE(supportedLocales[0].EqualsLiteral("sr-Cyrl"));
+  ASSERT_TRUE(supportedLocales[1].EqualsLiteral("en-US"));
+}
+
+TEST(Intl_Locale_LocaleService, UseLSDefaultLocale)
+{
+  nsTArray<nsCString> requestedLocales;
+  nsTArray<nsCString> availableLocales;
+  nsTArray<nsCString> supportedLocales;
+  nsAutoCString defaultLocale("en-US");
+  int32_t strategy = LocaleService::kLangNegStrategyLookup;
+
+  requestedLocales.AppendElement("sr"_ns);
+
+  availableLocales.AppendElement("de"_ns);
+
+  LocaleService::GetInstance()->NegotiateLanguages(
+      requestedLocales, availableLocales, defaultLocale, strategy,
+      supportedLocales);
+
+  nsAutoCString lsDefaultLocale;
+  LocaleService::GetInstance()->GetDefaultLocale(lsDefaultLocale);
+  ASSERT_TRUE(supportedLocales.Length() == 1);
+  ASSERT_TRUE(supportedLocales[0].Equals(lsDefaultLocale));
+}
diff --git a/intl/locale/tests/gtest/TestOSPreferences.cpp b/intl/locale/tests/gtest/TestOSPreferences.cpp
new file mode 100644
index 0000000000..7e3b71582b
--- /dev/null
+++ b/intl/locale/tests/gtest/TestOSPreferences.cpp
@@ -0,0 +1,205 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/gtest/MozAssertions.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/intl/LocaleService.h"
+#include "mozilla/intl/OSPreferences.h"
+
+using namespace mozilla::intl;
+
+/**
+ * We test that on all platforms we test against (irrelevant of the tier),
+ * we will be able to retrieve at least a single locale out of the system.
+ *
+ * In theory, that may not be true, but if we encounter such platform we should
+ * decide how to handle this and special case and this test should make
+ * it not happen without us noticing.
+ */
+TEST(Intl_Locale_OSPreferences, GetSystemLocales)
+{
+  nsTArray<nsCString> systemLocales;
+  ASSERT_TRUE(NS_SUCCEEDED(
+      OSPreferences::GetInstance()->GetSystemLocales(systemLocales)));
+
+  ASSERT_FALSE(systemLocales.IsEmpty());
+}
+
+/**
+ * We test that on all platforms we test against (irrelevant of the tier),
+ * we will be able to retrieve at least a single locale out of the system.
+ *
+ * In theory, that may not be true, but if we encounter such platform we should
+ * decide how to handle this and special case and this test should make
+ * it not happen without us noticing.
+ */
+TEST(Intl_Locale_OSPreferences, GetRegionalPrefsLocales)
+{
+  nsTArray<nsCString> rgLocales;
+  ASSERT_TRUE(NS_SUCCEEDED(
+      OSPreferences::GetInstance()->GetRegionalPrefsLocales(rgLocales)));
+
+  ASSERT_FALSE(rgLocales.IsEmpty());
+}
+
+/**
+ * We test that on all platforms we test against,
+ * we will be able to retrieve a date and time pattern.
+ *
+ * This may come back empty on platforms where we don't have platforms
+ * bindings for, so effectively, we're testing for crashes. We should
+ * never crash.
+ */
+TEST(Intl_Locale_OSPreferences, GetDateTimePattern)
+{
+  nsAutoCString pattern;
+  OSPreferences* osprefs = OSPreferences::GetInstance();
+
+  struct Test {
+    int dateStyle;
+    int timeStyle;
+    const char* locale;
+  };
+  Test tests[] = {{0, 0, ""},   {1, 0, "pl"}, {2, 0, "de-DE"}, {3, 0, "fr"},
+                  {4, 0, "ar"},
+
+                  {0, 1, ""},   {0, 2, "it"}, {0, 3, ""},      {0, 4, "ru"},
+
+                  {4, 1, ""},   {3, 2, "cs"}, {2, 3, ""},      {1, 4, "ja"}};
+
+  for (unsigned i = 0; i < mozilla::ArrayLength(tests); i++) {
+    const Test& t = tests[i];
+    if (NS_SUCCEEDED(osprefs->GetDateTimePattern(
+            t.dateStyle, t.timeStyle, nsDependentCString(t.locale), pattern))) {
+      ASSERT_TRUE((t.dateStyle == 0 && t.timeStyle == 0) || !pattern.IsEmpty());
+    }
+  }
+
+  // If the locale is not specified, we should get the pattern corresponding to
+  // the first regional prefs locale.
+  AutoTArray<nsCString, 10> rpLocales;
+  LocaleService::GetInstance()->GetRegionalPrefsLocales(rpLocales);
+  ASSERT_TRUE(rpLocales.Length() > 0);
+
+  nsAutoCString rpLocalePattern;
+  ASSERT_TRUE(NS_SUCCEEDED(
+      osprefs->GetDateTimePattern(mozIOSPreferences::dateTimeFormatStyleLong,
+                                  mozIOSPreferences::dateTimeFormatStyleLong,
+                                  rpLocales[0], rpLocalePattern)));
+  ASSERT_TRUE(NS_SUCCEEDED(
+      osprefs->GetDateTimePattern(mozIOSPreferences::dateTimeFormatStyleLong,
+                                  mozIOSPreferences::dateTimeFormatStyleLong,
+                                  nsDependentCString(""), pattern)));
+  ASSERT_EQ(rpLocalePattern, pattern);
+}
+
+/**
+ * Test that is possible to override the OS defaults through a pref.
+ */
+TEST(Intl_Locale_OSPreferences, GetDateTimePatternPrefOverrides)
+{
+  nsresult nr;
+  nsAutoCString default_pattern, pattern;
+  OSPreferences* osprefs = OSPreferences::GetInstance();
+
+  struct {
+    const char* DatePref;
+    const char* TimePref;
+    int32_t DateTimeFormatStyle;
+  } configs[] = {{"intl.date_time.pattern_override.date_short",
+                  "intl.date_time.pattern_override.time_short",
+                  mozIOSPreferences::dateTimeFormatStyleShort},
+                 {"intl.date_time.pattern_override.date_medium",
+                  "intl.date_time.pattern_override.time_medium",
+                  mozIOSPreferences::dateTimeFormatStyleMedium},
+                 {"intl.date_time.pattern_override.date_long",
+                  "intl.date_time.pattern_override.time_long",
+                  mozIOSPreferences::dateTimeFormatStyleLong},
+                 {"intl.date_time.pattern_override.date_full",
+                  "intl.date_time.pattern_override.time_full",
+                  mozIOSPreferences::dateTimeFormatStyleFull}};
+
+  for (const auto& config : configs) {
+    // Get default value for the OS
+    nr = osprefs->GetDateTimePattern(config.DateTimeFormatStyle,
+                                     mozIOSPreferences::dateTimeFormatStyleNone,
+                                     nsDependentCString(""), default_pattern);
+    ASSERT_NS_SUCCEEDED(nr);
+
+    // Override date format
+    mozilla::Preferences::SetCString(config.DatePref, "yy-MM");
+    nr = osprefs->GetDateTimePattern(config.DateTimeFormatStyle,
+                                     mozIOSPreferences::dateTimeFormatStyleNone,
+                                     nsDependentCString(""), pattern);
+    ASSERT_NS_SUCCEEDED(nr);
+    ASSERT_TRUE(pattern.EqualsASCII("yy-MM"));
+
+    // Override time format
+    mozilla::Preferences::SetCString(config.TimePref, "HH:mm");
+    nr = osprefs->GetDateTimePattern(mozIOSPreferences::dateTimeFormatStyleNone,
+                                     config.DateTimeFormatStyle,
+                                     nsDependentCString(""), pattern);
+    ASSERT_NS_SUCCEEDED(nr);
+    ASSERT_TRUE(pattern.EqualsASCII("HH:mm"));
+
+    // Override both
+    nr = osprefs->GetDateTimePattern(config.DateTimeFormatStyle,
+                                     config.DateTimeFormatStyle,
+                                     nsDependentCString(""), pattern);
+    ASSERT_NS_SUCCEEDED(nr);
+    ASSERT_TRUE(pattern.Find("yy-MM") != kNotFound);
+    ASSERT_TRUE(pattern.Find("HH:mm") != kNotFound);
+
+    // Clear overrides, we should get the default value back.
+    mozilla::Preferences::ClearUser(config.DatePref);
+    mozilla::Preferences::ClearUser(config.TimePref);
+    nr = osprefs->GetDateTimePattern(config.DateTimeFormatStyle,
+                                     mozIOSPreferences::dateTimeFormatStyleNone,
+                                     nsDependentCString(""), pattern);
+    ASSERT_NS_SUCCEEDED(nr);
+    ASSERT_EQ(default_pattern, pattern);
+  }
+
+  // Test overriding connector
+  nr = osprefs->GetDateTimePattern(mozIOSPreferences::dateTimeFormatStyleShort,
+                                   mozIOSPreferences::dateTimeFormatStyleShort,
+                                   nsDependentCString(""), default_pattern);
+
+  mozilla::Preferences::SetCString("intl.date_time.pattern_override.date_short",
+                                   "yyyy-MM-dd");
+  mozilla::Preferences::SetCString("intl.date_time.pattern_override.time_short",
+                                   "HH:mm:ss");
+  mozilla::Preferences::SetCString(
+      "intl.date_time.pattern_override.connector_short", "{1} {0}");
+  nr = osprefs->GetDateTimePattern(mozIOSPreferences::dateTimeFormatStyleShort,
+                                   mozIOSPreferences::dateTimeFormatStyleShort,
+                                   nsDependentCString(""), pattern);
+  ASSERT_NS_SUCCEEDED(nr);
+  ASSERT_TRUE(pattern.EqualsASCII("yyyy-MM-dd HH:mm:ss"));
+
+  // Reset to date and time to defaults
+  mozilla::Preferences::ClearUser("intl.date_time.pattern_override.date_short");
+  mozilla::Preferences::ClearUser("intl.date_time.pattern_override.time_short");
+
+  // Invalid patterns are ignored
+  mozilla::Preferences::SetCString(
+      "intl.date_time.pattern_override.connector_short", "hello, world!");
+  nr = osprefs->GetDateTimePattern(mozIOSPreferences::dateTimeFormatStyleShort,
+                                   mozIOSPreferences::dateTimeFormatStyleShort,
+                                   nsDependentCString(""), pattern);
+  ASSERT_NS_SUCCEEDED(nr);
+  ASSERT_EQ(default_pattern, pattern);
+
+  // Clearing the override results in getting the default pattern back.
+  mozilla::Preferences::ClearUser(
+      "intl.date_time.pattern_override.connector_short");
+  nr = osprefs->GetDateTimePattern(mozIOSPreferences::dateTimeFormatStyleShort,
+                                   mozIOSPreferences::dateTimeFormatStyleShort,
+                                   nsDependentCString(""), pattern);
+  ASSERT_NS_SUCCEEDED(nr);
+  ASSERT_EQ(default_pattern, pattern);
+}
diff --git a/intl/locale/tests/gtest/moz.build b/intl/locale/tests/gtest/moz.build
new file mode 100644
index 0000000000..bd2a2b8f86
--- /dev/null
+++ b/intl/locale/tests/gtest/moz.build
@@ -0,0 +1,14 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+UNIFIED_SOURCES += [
+    "TestAppDateTimeFormat.cpp",
+    "TestLocaleService.cpp",
+    "TestLocaleServiceNegotiate.cpp",
+    "TestOSPreferences.cpp",
+]
+
+FINAL_LIBRARY = "xul-gtest"
diff --git a/intl/locale/tests/sort/us-ascii_base.txt b/intl/locale/tests/sort/us-ascii_base.txt
new file mode 100644
index 0000000000..3bc7fbc7be
--- /dev/null
+++ b/intl/locale/tests/sort/us-ascii_base.txt
@@ -0,0 +1,95 @@
+ 
+!
+"
+#
+$
+%
+&
+'
+(
+)
+*
++
+,
+-
+.
+/
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
+:
+;
+<
+=
+>
+?
+@
+A
+B
+C
+D
+E
+F
+G
+H
+I
+J
+K
+L
+M
+N
+O
+P
+Q
+R
+S
+T
+U
+V
+W
+X
+Y
+Z
+[
+\
+]
+^
+_
+`
+a
+b
+c
+d
+e
+f
+g
+h
+i
+j
+k
+l
+m
+n
+o
+p
+q
+r
+s
+t
+u
+v
+w
+x
+y
+z
+{
+|
+}
+~
diff --git a/intl/locale/tests/sort/us-ascii_base_case_res.txt b/intl/locale/tests/sort/us-ascii_base_case_res.txt
new file mode 100644
index 0000000000..3e526d226b
--- /dev/null
+++ b/intl/locale/tests/sort/us-ascii_base_case_res.txt
@@ -0,0 +1,96 @@
+'
+-
+ 
+!
+"
+#
+$
+%
+&
+(
+)
+*
+,
+.
+/
+:
+;
+?
+@
+[
+\
+]
+^
+_
+`
+{
+|
+}
+~
++
+<
+=
+>
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
+a
+A
+b
+B
+c
+C
+d
+D
+e
+E
+f
+F
+g
+G
+h
+H
+i
+I
+j
+J
+k
+K
+l
+L
+m
+M
+n
+N
+o
+O
+p
+P
+q
+Q
+r
+R
+s
+S
+t
+T
+u
+U
+v
+V
+w
+W
+x
+X
+y
+Y
+z
+Z
+
diff --git a/intl/locale/tests/sort/us-ascii_base_nocase_res.txt b/intl/locale/tests/sort/us-ascii_base_nocase_res.txt
new file mode 100644
index 0000000000..2d18096db5
--- /dev/null
+++ b/intl/locale/tests/sort/us-ascii_base_nocase_res.txt
@@ -0,0 +1,96 @@
+'
+-
+ 
+!
+"
+#
+$
+%
+&
+(
+)
+*
+,
+.
+/
+:
+;
+?
+@
+[
+\
+]
+^
+_
+`
+{
+|
+}
+~
++
+<
+=
+>
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
+A
+a
+B
+b
+C
+c
+d
+D
+e
+E
+f
+F
+g
+G
+h
+H
+i
+I
+j
+J
+k
+K
+L
+l
+m
+M
+n
+N
+O
+o
+p
+P
+q
+Q
+r
+R
+s
+S
+t
+T
+u
+U
+v
+V
+w
+W
+X
+x
+Y
+y
+Z
+z
+
diff --git a/intl/locale/tests/sort/us-ascii_sort.txt b/intl/locale/tests/sort/us-ascii_sort.txt
new file mode 100644
index 0000000000..b6962f8de8
--- /dev/null
+++ b/intl/locale/tests/sort/us-ascii_sort.txt
@@ -0,0 +1,78 @@
+ludwig van beethoven
+Ludwig van Beethoven
+Ludwig van beethoven
+Jane
+jane
+JANE
+jAne
+jaNe
+janE
+JAne
+JaNe
+JanE
+JANe
+JaNE
+JAnE
+jANE
+Umberto Eco
+Umberto eco
+umberto eco
+umberto Eco
+UMBERTO ECO
+ace
+bash
+*ace
+!ace
+%ace
+~ace
+#ace
+cork
+denizen
+[denizen]
+(denizen)
+{denizen}
+/denizen/
+#denizen#
+$denizen$
+@denizen
+elf
+full
+gnome
+gnomic investigation of typological factors in the grammaticalization process of Malayo-Polynesian substaratum in the protoAltaic vocabulary core in the proto-layers of pre-historic Japanese
+gnomic investigation of typological factors in the grammaticalization process of Malayo-Polynesian substaratum in the protoAltaic vocabulary core in the proto-layers of pre-historic Javanese
+hint
+Internationalization
+Zinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalization
+Zinternationalization internationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizatio
+n
+Zinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalization internationalizationinternationalizationinternationalizationinternationalizationinternationalization
+ZinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizaTioninternationalizationinternationalizationinternationalizationinternationalization
+ZinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizaTion
+jostle
+kin
+Laymen
+lumens
+Lumens
+motleycrew
+motley crew
+niven's creative talents
+nivens creative talents
+opie
+posh restaurants in surbanized and still urban incorporated subsection of this beautifl city in the Rockies
+posh restaurants in surbanized and still urban incorporated subsection of this beautifl city in the Rokkies
+posh restaurants in surbanized and still urban incorporated subsection of this beautifl city in the rockies
+quilt's
+quilts
+quilt
+Rondo
+street
+tamale oxidization and iodization in rapid progress
+tamale oxidization and iodization in rapid Progress
+until
+vera
+Wobble
+Xanadu's legenary imaginary floccinaucinihilipilification in localization of theoretical portions of glottochronological understanding of the phoneme
+Xanadu's legenary imaginary floccinaucinihilipilification in localization of theoretical portions of glottochronological understanding of the phoname
+yearn
+zodiac
+
diff --git a/intl/locale/tests/sort/us-ascii_sort_case_res.txt b/intl/locale/tests/sort/us-ascii_sort_case_res.txt
new file mode 100644
index 0000000000..2720a83426
--- /dev/null
+++ b/intl/locale/tests/sort/us-ascii_sort_case_res.txt
@@ -0,0 +1,79 @@
+!ace
+#ace
+#denizen#
+$denizen$
+%ace
+(denizen)
+*ace
+/denizen/
+@denizen
+[denizen]
+{denizen}
+~ace
+ace
+bash
+cork
+denizen
+elf
+full
+gnome
+gnomic investigation of typological factors in the grammaticalization process of Malayo-Polynesian substaratum in the protoAltaic vocabulary core in the proto-layers of pre-historic Japanese
+gnomic investigation of typological factors in the grammaticalization process of Malayo-Polynesian substaratum in the protoAltaic vocabulary core in the proto-layers of pre-historic Javanese
+hint
+Internationalization
+jane
+janE
+jaNe
+jAne
+jANE
+Jane
+JanE
+JaNe
+JaNE
+JAne
+JAnE
+JANe
+JANE
+jostle
+kin
+Laymen
+ludwig van beethoven
+Ludwig van beethoven
+Ludwig van Beethoven
+lumens
+Lumens
+motley crew
+motleycrew
+nivens creative talents
+niven's creative talents
+opie
+posh restaurants in surbanized and still urban incorporated subsection of this beautifl city in the rockies
+posh restaurants in surbanized and still urban incorporated subsection of this beautifl city in the Rockies
+posh restaurants in surbanized and still urban incorporated subsection of this beautifl city in the Rokkies
+quilt
+quilts
+quilt's
+Rondo
+street
+tamale oxidization and iodization in rapid progress
+tamale oxidization and iodization in rapid Progress
+umberto eco
+umberto Eco
+Umberto eco
+Umberto Eco
+UMBERTO ECO
+until
+veda
+Veda
+vera
+Vera
+Wobble
+Xanadu's legenary imaginary floccinaucinihilipilification in localization of theoretical portions of glottochronological understanding of the phoname
+Xanadu's legenary imaginary floccinaucinihilipilification in localization of theoretical portions of glottochronological understanding of the phoneme
+yearn
+Zinternationalization internationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalization
+Zinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalization internationalizationinternationalizationinternationalizationinternationalizationinternationalization
+Zinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalization
+ZinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizaTion
+ZinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizaTioninternationalizationinternationalizationinternationalizationinternationalization
+zodiac
diff --git a/intl/locale/tests/sort/us-ascii_sort_nocase_res.txt b/intl/locale/tests/sort/us-ascii_sort_nocase_res.txt
new file mode 100644
index 0000000000..fa3426d4e9
--- /dev/null
+++ b/intl/locale/tests/sort/us-ascii_sort_nocase_res.txt
@@ -0,0 +1,79 @@
+!ace
+#ace
+#denizen#
+$denizen$
+%ace
+(denizen)
+*ace
+/denizen/
+@denizen
+[denizen]
+{denizen}
+~ace
+ace
+bash
+cork
+denizen
+elf
+full
+gnome
+gnomic investigation of typological factors in the grammaticalization process of Malayo-Polynesian substaratum in the protoAltaic vocabulary core in the proto-layers of pre-historic Japanese
+gnomic investigation of typological factors in the grammaticalization process of Malayo-Polynesian substaratum in the protoAltaic vocabulary core in the proto-layers of pre-historic Javanese
+hint
+Internationalization
+JANe
+jANE
+JAnE
+JaNE
+Jane
+JanE
+JaNe
+JAne
+janE
+jaNe
+jAne
+JANE
+jane
+jostle
+kin
+Laymen
+Ludwig van beethoven
+Ludwig van Beethoven
+ludwig van beethoven
+Lumens
+lumens
+motley crew
+motleycrew
+nivens creative talents
+niven's creative talents
+opie
+posh restaurants in surbanized and still urban incorporated subsection of this beautifl city in the rockies
+posh restaurants in surbanized and still urban incorporated subsection of this beautifl city in the Rockies
+posh restaurants in surbanized and still urban incorporated subsection of this beautifl city in the Rokkies
+quilt
+quilts
+quilt's
+Rondo
+street
+tamale oxidization and iodization in rapid Progress
+tamale oxidization and iodization in rapid progress
+Umberto eco
+Umberto Eco
+umberto eco
+UMBERTO ECO
+umberto Eco
+until
+Veda
+veda
+Vera
+vera
+Wobble
+Xanadu's legenary imaginary floccinaucinihilipilification in localization of theoretical portions of glottochronological understanding of the phoname
+Xanadu's legenary imaginary floccinaucinihilipilification in localization of theoretical portions of glottochronological understanding of the phoneme
+yearn
+Zinternationalization internationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalization
+Zinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalization internationalizationinternationalizationinternationalizationinternationalizationinternationalization
+ZinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizaTioninternationalizationinternationalizationinternationalizationinternationalization
+ZinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizaTion
+Zinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalizationinternationalization
+zodiac
diff --git a/intl/locale/tests/unit/data/chrome.manifest b/intl/locale/tests/unit/data/chrome.manifest
new file mode 100644
index 0000000000..a8678deef3
--- /dev/null
+++ b/intl/locale/tests/unit/data/chrome.manifest
@@ -0,0 +1 @@
+content locale ./
diff --git a/intl/locale/tests/unit/data/intl_on_workers_worker.js b/intl/locale/tests/unit/data/intl_on_workers_worker.js
new file mode 100644
index 0000000000..e6f01e71a8
--- /dev/null
+++ b/intl/locale/tests/unit/data/intl_on_workers_worker.js
@@ -0,0 +1,6 @@
+/* eslint-env worker */
+
+self.onmessage = function (data) {
+  let myLocale = Intl.NumberFormat().resolvedOptions().locale;
+  self.postMessage(myLocale);
+};
diff --git a/intl/locale/tests/unit/test_bug1086527.js b/intl/locale/tests/unit/test_bug1086527.js
new file mode 100644
index 0000000000..5e33ce060a
--- /dev/null
+++ b/intl/locale/tests/unit/test_bug1086527.js
@@ -0,0 +1,22 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * This unit test makes sure that PluralForm.get can be called from strict mode
+ */
+
+const { PluralForm } = ChromeUtils.importESModule(
+  "resource://gre/modules/PluralForm.sys.mjs"
+);
+
+delete PluralForm.numForms;
+delete PluralForm.get;
+[PluralForm.get, PluralForm.numForms] = PluralForm.makeGetter(9);
+
+function run_test() {
+  "use strict";
+
+  Assert.equal(3, PluralForm.numForms());
+  Assert.equal("one", PluralForm.get(5, "one;many"));
+}
diff --git a/intl/locale/tests/unit/test_bug22310.js b/intl/locale/tests/unit/test_bug22310.js
new file mode 100644
index 0000000000..c14296d931
--- /dev/null
+++ b/intl/locale/tests/unit/test_bug22310.js
@@ -0,0 +1,65 @@
+String.prototype.has = function (s) {
+  return this.includes(s);
+};
+
+function dt(locale) {
+  var date = new Date("2008-06-30T13:56:34");
+  const dtOptions = {
+    year: "numeric",
+    month: "long",
+    day: "numeric",
+    hour: "numeric",
+    minute: "numeric",
+    second: "numeric",
+  };
+  return date.toLocaleString(locale, dtOptions);
+}
+
+var all_passed = true;
+const tests = [
+  [dt("en-US").has("June"), "month name in en-US"],
+  [dt("en-US").has("2008"), "year in en-US"],
+  [dt("da").has("jun"), "month name in da"],
+  [dt("da-DK") == dt("da"), "da same as da-DK"],
+  [
+    dt("en-GB").has("30") &&
+      dt("en-GB").has("June") &&
+      dt("en-GB").indexOf("30") < dt("en-GB").indexOf("June"),
+    "day before month in en-GB",
+  ],
+  [
+    dt("en-US").has("30") &&
+      dt("en-US").has("June") &&
+      dt("en-US").indexOf("30") > dt("en-US").indexOf("June"),
+    "month before day in en-US",
+  ],
+  [dt("ja-JP").has("\u5E746\u670830\u65E5"), "year month and day in ja-JP"],
+  // The Firefox locale code ja-JP-mac will be resolved to a BCP47-compliant
+  // tag ja-JP-x-lvariant-mac by uloc_toLanguageTag
+  [
+    dt("ja-JP") == dt("ja-JP-x-lvariant-mac"),
+    "ja-JP-x-lvariant-mac same as ja-JP",
+  ],
+  [dt("nn-NO").has("juni"), "month name in nn-NO"],
+  [dt("nb-NO").has("juni"), "month name in nb-NO"],
+  // Bug 1261775 - failures on win10
+  //[dt("no-NO").has("30. juni"), "month name in no-NO"],
+  [dt("sv-SE").has("30 jun"), "month name in sv-SE"],
+  [dt("kok").has("\u091C\u0942\u0928"), "month name in kok"],
+  [dt("ta-IN").has("\u0B9C\u0BC2\u0BA9\u0BCD"), "month name in ta-IN"],
+  [!!dt("ab-CD").length, "fallback for ab-CD"],
+];
+
+function one_test(testcase, msg) {
+  if (!testcase) {
+    all_passed = false;
+    dump("Unexpected date format: " + msg + "\n");
+  }
+}
+
+function run_test() {
+  for (var i = 0; i < tests.length; ++i) {
+    one_test(tests[i][0], tests[i][1]);
+  }
+  Assert.ok(all_passed);
+}
diff --git a/intl/locale/tests/unit/test_intl_on_workers.js b/intl/locale/tests/unit/test_intl_on_workers.js
new file mode 100644
index 0000000000..b5e05c4678
--- /dev/null
+++ b/intl/locale/tests/unit/test_intl_on_workers.js
@@ -0,0 +1,29 @@
+function run_test() {
+  do_load_manifest("data/chrome.manifest");
+
+  if (typeof Intl !== "object") {
+    dump("Intl not enabled, skipping test\n");
+    equal(true, true);
+    return;
+  }
+
+  let mainThreadLocale = Intl.NumberFormat().resolvedOptions().locale;
+  let testWorker = new Worker(
+    "chrome://locale/content/intl_on_workers_worker.js"
+  );
+  testWorker.onmessage = function (e) {
+    try {
+      let workerLocale = e.data;
+      equal(
+        mainThreadLocale,
+        workerLocale,
+        "Worker should inherit Intl locale from main thread."
+      );
+    } finally {
+      do_test_finished();
+    }
+  };
+
+  do_test_pending();
+  testWorker.postMessage("go!");
+}
diff --git a/intl/locale/tests/unit/test_langPackMatcher.js b/intl/locale/tests/unit/test_langPackMatcher.js
new file mode 100644
index 0000000000..03adec7bff
--- /dev/null
+++ b/intl/locale/tests/unit/test_langPackMatcher.js
@@ -0,0 +1,287 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const { getAddonAndLocalAPIsMocker } = ChromeUtils.importESModule(
+  "resource://testing-common/LangPackMatcherTestUtils.sys.mjs"
+);
+const { LangPackMatcher } = ChromeUtils.importESModule(
+  "resource://gre/modules/LangPackMatcher.sys.mjs"
+);
+const { sinon } = ChromeUtils.importESModule(
+  "resource://testing-common/Sinon.sys.mjs"
+);
+
+const sandbox = sinon.createSandbox();
+const mockAddonAndLocaleAPIs = getAddonAndLocalAPIsMocker(this, sandbox);
+
+add_task(function initSandbox() {
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+});
+
+add_task(function test_appLocaleLanguageMismatch() {
+  sandbox.restore();
+  mockAddonAndLocaleAPIs({
+    systemLocale: "es-ES",
+    appLocale: "en-US",
+  });
+
+  deepEqual(LangPackMatcher.getAppAndSystemLocaleInfo(), {
+    systemLocaleRaw: "es-ES",
+    systemLocale: { baseName: "es-ES", language: "es", region: "ES" },
+    appLocaleRaw: "en-US",
+    appLocale: { baseName: "en-US", language: "en", region: "US" },
+    matchType: "language-mismatch",
+    canLiveReload: true,
+    displayNames: {
+      systemLanguage: "Español (ES)",
+      appLanguage: "English (US)",
+    },
+  });
+});
+
+add_task(function test_appLocaleRegionMismatch() {
+  sandbox.restore();
+  mockAddonAndLocaleAPIs({
+    sandbox,
+    systemLocale: "en-CA",
+    appLocale: "en-US",
+  });
+
+  deepEqual(LangPackMatcher.getAppAndSystemLocaleInfo(), {
+    systemLocaleRaw: "en-CA",
+    systemLocale: { baseName: "en-CA", language: "en", region: "CA" },
+    appLocaleRaw: "en-US",
+    appLocale: { baseName: "en-US", language: "en", region: "US" },
+    matchType: "region-mismatch",
+    canLiveReload: true,
+    displayNames: {
+      systemLanguage: "English (CA)",
+      appLanguage: "English (US)",
+    },
+  });
+});
+
+add_task(function test_appLocaleScriptMismatch() {
+  sandbox.restore();
+  // Script mismatch:
+  mockAddonAndLocaleAPIs({
+    sandbox,
+    systemLocale: "zh-Hans-CN",
+    appLocale: "zh-CN",
+  });
+
+  deepEqual(LangPackMatcher.getAppAndSystemLocaleInfo(), {
+    systemLocaleRaw: "zh-Hans-CN",
+    systemLocale: { baseName: "zh-Hans-CN", language: "zh", region: "CN" },
+    appLocaleRaw: "zh-CN",
+    appLocale: { baseName: "zh-CN", language: "zh", region: "CN" },
+    matchType: "match",
+    canLiveReload: true,
+    displayNames: {
+      systemLanguage: "Chinese (Hans, China)",
+      appLanguage: "简体中文",
+    },
+  });
+});
+
+add_task(function test_appLocaleInvalidSystem() {
+  sandbox.restore();
+  // Script mismatch:
+  mockAddonAndLocaleAPIs({
+    sandbox,
+    systemLocale: "Not valid",
+    appLocale: "en-US",
+  });
+
+  deepEqual(LangPackMatcher.getAppAndSystemLocaleInfo(), {
+    systemLocaleRaw: "Not valid",
+    systemLocale: null,
+    appLocaleRaw: "en-US",
+    appLocale: { baseName: "en-US", language: "en", region: "US" },
+    matchType: "unknown",
+    canLiveReload: null,
+    displayNames: { systemLanguage: null, appLanguage: "English (US)" },
+  });
+});
+
+add_task(function test_bidiSwitchDisabled() {
+  Services.prefs.setBoolPref(
+    "intl.multilingual.liveReloadBidirectional",
+    false
+  );
+  sandbox.restore();
+  // Script mismatch:
+  mockAddonAndLocaleAPIs({
+    sandbox,
+    systemLocale: "ar-EG",
+    appLocale: "en-US",
+  });
+
+  deepEqual(LangPackMatcher.getAppAndSystemLocaleInfo(), {
+    systemLocaleRaw: "ar-EG",
+    systemLocale: { baseName: "ar-EG", language: "ar", region: "EG" },
+    appLocaleRaw: "en-US",
+    appLocale: { baseName: "en-US", language: "en", region: "US" },
+    matchType: "language-mismatch",
+    canLiveReload: false,
+    displayNames: {
+      systemLanguage: "Arabic (Egypt)",
+      appLanguage: "English (US)",
+    },
+  });
+  Services.prefs.clearUserPref("intl.multilingual.liveReloadBidirectional");
+});
+
+add_task(async function test_bidiSwitchEnabled() {
+  Services.prefs.setBoolPref("intl.multilingual.liveReloadBidirectional", true);
+  sandbox.restore();
+  // Script mismatch:
+  mockAddonAndLocaleAPIs({
+    sandbox,
+    systemLocale: "ar-EG",
+    appLocale: "en-US",
+  });
+
+  deepEqual(LangPackMatcher.getAppAndSystemLocaleInfo(), {
+    systemLocaleRaw: "ar-EG",
+    systemLocale: { baseName: "ar-EG", language: "ar", region: "EG" },
+    appLocaleRaw: "en-US",
+    appLocale: { baseName: "en-US", language: "en", region: "US" },
+    matchType: "language-mismatch",
+    canLiveReload: true,
+    displayNames: {
+      systemLanguage: "Arabic (Egypt)",
+      appLanguage: "English (US)",
+    },
+  });
+
+  Services.prefs.clearUserPref("intl.multilingual.liveReloadBidirectional");
+});
+
+function shuffle(array) {
+  return array
+    .map(value => ({ value, sort: Math.random() }))
+    .sort((a, b) => a.sort - b.sort)
+    .map(({ value }) => value);
+}
+
+add_task(async function test_negotiateLangPacks() {
+  const negotiations = [
+    {
+      // Exact match found.
+      systemLocale: "en-US",
+      availableLangPacks: ["en", "en-US", "zh", "zh-CN", "zh-Hans-CN"],
+      expectedLangPack: "en-US",
+      expectedDisplayName: "English (US)",
+    },
+    {
+      // Region-less match.
+      systemLocale: "en-CA",
+      availableLangPacks: ["en", "en-US", "zh", "zh-CN", "zh-Hans-CN"],
+      expectedLangPack: "en",
+      expectedDisplayName: "English",
+    },
+    {
+      // Fallback to a different region.
+      systemLocale: "en-CA",
+      availableLangPacks: ["en-US", "zh", "zh-CN", "zh-Hans-CN"],
+      expectedLangPack: "en-US",
+      expectedDisplayName: "English (US)",
+    },
+    {
+      // Match with a script. zh-Hans-CN is the locale used with simplified
+      // Chinese scripts, while zh-CN uses the Latin script.
+      systemLocale: "zh-Hans-CN",
+      availableLangPacks: ["en", "en-US", "zh", "zh-CN", "zh-TW", "zh-Hans-CN"],
+      expectedLangPack: "zh-Hans-CN",
+      expectedDisplayName: "Chinese (Hans, China)",
+    },
+    {
+      // Match excluding script but matching region. zh-Hant-TW should
+      // match zh-TW before zh-CN.
+      systemLocale: "zh-Hant-TW",
+      availableLangPacks: ["en", "zh", "zh-CN", "zh-TW"],
+      expectedLangPack: "zh-TW",
+      expectedDisplayName: "正體中文",
+    },
+    {
+      // No reasonable match could be found.
+      systemLocale: "tlh", // Klingon
+      availableLangPacks: ["en", "en-US", "zh", "zh-CN", "zh-Hans-CN"],
+      expectedLangPack: null,
+      expectedDisplayName: null,
+    },
+    {
+      // Weird, but valid locale identifiers.
+      systemLocale: "en-US-u-hc-h23-ca-islamic-civil-ss-true",
+      availableLangPacks: ["en", "en-US", "zh", "zh-CN", "zh-Hans-CN"],
+      expectedLangPack: "en-US",
+      expectedDisplayName: "English (US)",
+    },
+    {
+      // Invalid system locale
+      systemLocale: "Not valid",
+      availableLangPacks: ["en", "en-US", "zh", "zh-CN", "zh-Hans-CN"],
+      expectedLangPack: null,
+      expectedDisplayName: null,
+    },
+  ];
+
+  for (const {
+    systemLocale,
+    availableLangPacks,
+    expectedLangPack,
+    expectedDisplayName,
+  } of negotiations) {
+    sandbox.restore();
+    const { resolveLangPacks } = mockAddonAndLocaleAPIs({
+      sandbox,
+      systemLocale,
+    });
+
+    const promise = LangPackMatcher.negotiateLangPackForLanguageMismatch();
+    // Shuffle the order to ensure that this test doesn't require on ordering of the
+    // langpack responses.
+    resolveLangPacks(shuffle(availableLangPacks));
+    const { langPack, langPackDisplayName } = await promise;
+    equal(
+      langPack?.target_locale,
+      expectedLangPack,
+      `Resolve the systemLocale "${systemLocale}" with available langpacks: ${JSON.stringify(
+        availableLangPacks
+      )}`
+    );
+    equal(
+      langPackDisplayName,
+      expectedDisplayName,
+      "The display name matches."
+    );
+  }
+});
+
+add_task(async function test_ensureLangPackInstalled() {
+  sandbox.restore();
+  const { resolveLangPacks, resolveInstaller } = mockAddonAndLocaleAPIs({
+    sandbox,
+    systemLocale: "es-ES",
+    appLocale: "en-US",
+  });
+
+  const negotiatePromise =
+    LangPackMatcher.negotiateLangPackForLanguageMismatch();
+  resolveLangPacks(["es-ES"]);
+  const { langPack } = await negotiatePromise;
+
+  const installPromise1 = LangPackMatcher.ensureLangPackInstalled(langPack);
+  const installPromise2 = LangPackMatcher.ensureLangPackInstalled(langPack);
+
+  resolveInstaller(["fake langpack"]);
+
+  info("Ensure both installers resolve when called twice in a row.");
+  await installPromise1;
+  await installPromise2;
+  ok(true, "Both were called.");
+});
diff --git a/intl/locale/tests/unit/test_localeService.js b/intl/locale/tests/unit/test_localeService.js
new file mode 100644
index 0000000000..ae2d949e80
--- /dev/null
+++ b/intl/locale/tests/unit/test_localeService.js
@@ -0,0 +1,240 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const osPrefs = Cc["@mozilla.org/intl/ospreferences;1"].getService(
+  Ci.mozIOSPreferences
+);
+
+const localeService = Services.locale;
+
+/**
+ * Make sure the locale service can be instantiated.
+ */
+
+add_test(function test_defaultLocale() {
+  const defaultLocale = localeService.defaultLocale;
+  Assert.ok(defaultLocale.length !== 0, "Default locale is not empty");
+  run_next_test();
+});
+
+add_test(function test_lastFallbackLocale() {
+  const lastFallbackLocale = localeService.lastFallbackLocale;
+  Assert.ok(lastFallbackLocale === "en-US", "Last fallback locale is en-US");
+  run_next_test();
+});
+
+add_test(function test_appLocalesAsLangTags() {
+  const appLocale = localeService.appLocaleAsLangTag;
+  Assert.ok(appLocale != "", "appLocale is non-empty");
+
+  const appLocales = localeService.appLocalesAsLangTags;
+  Assert.ok(Array.isArray(appLocales), "appLocales returns an array");
+
+  Assert.ok(
+    appLocale == appLocales[0],
+    "appLocale matches first entry in appLocales"
+  );
+
+  const enUSLocales = appLocales.filter(loc => loc === "en-US");
+  Assert.ok(enUSLocales.length == 1, "en-US is present exactly one time");
+
+  run_next_test();
+});
+
+const PREF_REQUESTED_LOCALES = "intl.locale.requested";
+const REQ_LOC_CHANGE_EVENT = "intl:requested-locales-changed";
+
+add_test(function test_requestedLocales() {
+  const requestedLocales = localeService.requestedLocales;
+  Assert.ok(
+    Array.isArray(requestedLocales),
+    "requestedLocales returns an array"
+  );
+
+  run_next_test();
+});
+
+/**
+ * In this test we verify that after we set an observer on the LocaleService
+ * event for requested locales change, it will be fired when the
+ * pref for matchOS is set to true.
+ *
+ * Then, we test that when the matchOS is set to true, we will retrieve
+ * OS locale from requestedLocales.
+ */
+add_test(function test_requestedLocales_matchOS() {
+  do_test_pending();
+
+  Services.prefs.setCharPref(PREF_REQUESTED_LOCALES, "ar-IR");
+
+  const observer = {
+    observe(aSubject, aTopic, aData) {
+      switch (aTopic) {
+        case REQ_LOC_CHANGE_EVENT:
+          const reqLocs = localeService.requestedLocales;
+          Assert.ok(reqLocs[0] === osPrefs.systemLocale);
+          Services.obs.removeObserver(observer, REQ_LOC_CHANGE_EVENT);
+          do_test_finished();
+      }
+    },
+  };
+
+  Services.obs.addObserver(observer, REQ_LOC_CHANGE_EVENT);
+  Services.prefs.setCharPref(PREF_REQUESTED_LOCALES, "");
+
+  run_next_test();
+});
+
+/**
+ * In this test we verify that after we set an observer on the LocaleService
+ * event for requested locales change, it will be fired when the
+ * pref for browser UI locale changes.
+ */
+add_test(function test_requestedLocales_onChange() {
+  do_test_pending();
+
+  Services.prefs.setCharPref(PREF_REQUESTED_LOCALES, "ar-IR");
+
+  const observer = {
+    observe(aSubject, aTopic, aData) {
+      switch (aTopic) {
+        case REQ_LOC_CHANGE_EVENT:
+          const reqLocs = localeService.requestedLocales;
+          Assert.ok(reqLocs[0] === "sr-RU");
+          Services.obs.removeObserver(observer, REQ_LOC_CHANGE_EVENT);
+          do_test_finished();
+      }
+    },
+  };
+
+  Services.obs.addObserver(observer, REQ_LOC_CHANGE_EVENT);
+  Services.prefs.setCharPref(PREF_REQUESTED_LOCALES, "sr-RU");
+
+  run_next_test();
+});
+
+add_test(function test_requestedLocale() {
+  Services.prefs.setCharPref(PREF_REQUESTED_LOCALES, "tlh");
+
+  let requestedLocale = localeService.requestedLocale;
+  Assert.ok(
+    requestedLocale === "tlh",
+    "requestedLocale returns the right value"
+  );
+
+  Services.prefs.clearUserPref(PREF_REQUESTED_LOCALES);
+
+  run_next_test();
+});
+
+add_test(function test_requestedLocales() {
+  localeService.requestedLocales = ["de-AT", "de-DE", "de-CH"];
+
+  let locales = localeService.requestedLocales;
+  Assert.ok(locales[0] === "de-AT");
+  Assert.ok(locales[1] === "de-DE");
+  Assert.ok(locales[2] === "de-CH");
+
+  run_next_test();
+});
+
+add_test(function test_isAppLocaleRTL() {
+  Assert.ok(typeof localeService.isAppLocaleRTL === "boolean");
+
+  run_next_test();
+});
+
+add_test(function test_isAppLocaleRTL_pseudo() {
+  let avLocales = localeService.availableLocales;
+  let reqLocales = localeService.requestedLocales;
+
+  localeService.availableLocales = ["en-US"];
+  localeService.requestedLocales = ["en-US"];
+  Services.prefs.setCharPref("intl.l10n.pseudo", "");
+
+  Assert.ok(localeService.isAppLocaleRTL === false);
+
+  Services.prefs.setCharPref("intl.l10n.pseudo", "bidi");
+  Assert.ok(localeService.isAppLocaleRTL === true);
+
+  Services.prefs.setCharPref("intl.l10n.pseudo", "accented");
+  Assert.ok(localeService.isAppLocaleRTL === false);
+
+  // Clean up
+  localeService.availableLocales = avLocales;
+  localeService.requestedLocales = reqLocales;
+  Services.prefs.clearUserPref("intl.l10n.pseudo");
+
+  run_next_test();
+});
+
+add_test(function test_packagedLocales() {
+  const locales = localeService.packagedLocales;
+  Assert.ok(locales.length !== 0, "Packaged locales are empty");
+  run_next_test();
+});
+
+add_test(function test_availableLocales() {
+  const avLocales = localeService.availableLocales;
+  localeService.availableLocales = ["und", "ar-IR"];
+
+  let locales = localeService.availableLocales;
+  Assert.ok(locales.length == 2);
+  Assert.ok(locales[0] === "und");
+  Assert.ok(locales[1] === "ar-IR");
+
+  localeService.availableLocales = avLocales;
+
+  run_next_test();
+});
+
+/**
+ * This test verifies that all values coming from the pref are sanitized.
+ */
+add_test(function test_requestedLocales_sanitize() {
+  Services.prefs.setStringPref(
+    PREF_REQUESTED_LOCALES,
+    "de,2,#$@#,pl,ąó,!a2,DE-at,,;"
+  );
+
+  let locales = localeService.requestedLocales;
+  Assert.equal(locales[0], "de");
+  Assert.equal(locales[1], "pl");
+  Assert.equal(locales[2], "de-AT");
+  Assert.equal(locales.length, 3);
+
+  Services.prefs.clearUserPref(PREF_REQUESTED_LOCALES);
+
+  run_next_test();
+});
+
+add_test(function test_handle_ja_JP_mac() {
+  const bkpAvLocales = localeService.availableLocales;
+
+  localeService.availableLocales = ["ja-JP-mac", "en-US"];
+
+  localeService.requestedLocales = ["ja-JP-mac"];
+
+  let reqLocales = localeService.requestedLocales;
+  Assert.equal(reqLocales[0], "ja-JP-macos");
+
+  let avLocales = localeService.availableLocales;
+  Assert.equal(avLocales[0], "ja-JP-macos");
+
+  let appLocales = localeService.appLocalesAsBCP47;
+  Assert.equal(appLocales[0], "ja-JP-macos");
+
+  let appLocalesAsLT = localeService.appLocalesAsLangTags;
+  Assert.equal(appLocalesAsLT[0], "ja-JP-mac");
+
+  Assert.equal(localeService.appLocaleAsLangTag, "ja-JP-mac");
+
+  localeService.availableLocales = bkpAvLocales;
+
+  run_next_test();
+});
+
+registerCleanupFunction(() => {
+  Services.prefs.clearUserPref(PREF_REQUESTED_LOCALES);
+});
diff --git a/intl/locale/tests/unit/test_localeService_negotiateLanguages.js b/intl/locale/tests/unit/test_localeService_negotiateLanguages.js
new file mode 100644
index 0000000000..f929bc3a43
--- /dev/null
+++ b/intl/locale/tests/unit/test_localeService_negotiateLanguages.js
@@ -0,0 +1,205 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const localeService = Services.locale;
+
+const data = {
+  filtering: {
+    "exact match": [
+      [["en"], ["en"], ["en"]],
+      [["en-US"], ["en-US"], ["en-US"]],
+      [["en-Latn-US"], ["en-Latn-US"], ["en-Latn-US"]],
+      [["en-Latn-US-windows"], ["en-Latn-US-windows"], ["en-Latn-US-windows"]],
+      [["fr-FR"], ["de", "it", "fr-FR"], ["fr-FR"]],
+      [
+        ["fr", "pl", "de-DE"],
+        ["pl", "en-US", "de-DE"],
+        ["pl", "de-DE"],
+      ],
+    ],
+    "available as range": [
+      [["en-US"], ["en"], ["en"]],
+      [["en-Latn-US"], ["en-US"], ["en-US"]],
+      [["en-US-windows"], ["en-US"], ["en-US"]],
+      [
+        ["fr-CA", "de-DE"],
+        ["fr", "it", "de"],
+        ["fr", "de"],
+      ],
+      [["ja-JP-windows"], ["ja"], ["ja"]],
+      [
+        ["en-Latn-GB", "en-Latn-IN"],
+        ["en-IN", "en-GB"],
+        ["en-GB", "en-IN"],
+      ],
+    ],
+    "should match on likely subtag": [
+      [["en"], ["en-GB", "de", "en-US"], ["en-US", "en-GB"]],
+      [
+        ["en"],
+        ["en-Latn-GB", "de", "en-Latn-US"],
+        ["en-Latn-US", "en-Latn-GB"],
+      ],
+      [["fr"], ["fr-CA", "fr-FR"], ["fr-FR", "fr-CA"]],
+      [["az-IR"], ["az-Latn", "az-Arab"], ["az-Arab"]],
+      [["sr-RU"], ["sr-Cyrl", "sr-Latn"], ["sr-Latn"]],
+      [["sr"], ["sr-Latn", "sr-Cyrl"], ["sr-Cyrl"]],
+      [["zh-GB"], ["zh-Hans", "zh-Hant"], ["zh-Hant"]],
+      [["sr", "ru"], ["sr-Latn", "ru"], ["ru"]],
+      [["sr-RU"], ["sr-Latn-RO", "sr-Cyrl"], ["sr-Latn-RO"]],
+    ],
+    "should match likelySubtag region over other regions": [
+      [["en-CA"], ["en-ZA", "en-GB", "en-US"], ["en-US", "en-ZA", "en-GB"]],
+    ],
+    "should match cross-region": [
+      [["en"], ["en-US"], ["en-US"]],
+      [["en-US"], ["en-GB"], ["en-GB"]],
+      [["en-Latn-US"], ["en-Latn-GB"], ["en-Latn-GB"]],
+    ],
+    "should match cross-variant": [
+      [["en-US-linux"], ["en-US-windows"], ["en-US-windows"]],
+    ],
+    "should prioritize properly": [
+      // exact match first
+      [
+        ["en-US"],
+        ["en-US-windows", "en", "en-US"],
+        ["en-US", "en", "en-US-windows"],
+      ],
+      // available as range second
+      [["en-Latn-US"], ["en-GB", "en-US"], ["en-US", "en-GB"]],
+      // likely subtags third
+      [["en"], ["en-Cyrl-US", "en-Latn-US"], ["en-Latn-US"]],
+      // variant range fourth
+      [
+        ["en-US-macos"],
+        ["en-US-windows", "en-GB-macos"],
+        ["en-US-windows", "en-GB-macos"],
+      ],
+      // regional range fifth
+      [["en-US-macos"], ["en-GB-windows"], ["en-GB-windows"]],
+      [["en-US"], ["en-GB", "en"], ["en", "en-GB"]],
+      [
+        ["fr-CA-macos", "de-DE"],
+        ["de-DE", "fr-FR-windows"],
+        ["fr-FR-windows", "de-DE"],
+      ],
+    ],
+    "should handle default locale properly": [
+      [["fr"], ["de", "it"], []],
+      [["fr"], ["de", "it"], "en-US", ["en-US"]],
+      [["fr"], ["de", "en-US"], "en-US", ["en-US"]],
+      [
+        ["fr", "de-DE"],
+        ["de-DE", "fr-CA"],
+        "en-US",
+        ["fr-CA", "de-DE", "en-US"],
+      ],
+    ],
+    "should handle all matches on the 1st higher than any on the 2nd": [
+      [
+        ["fr-CA-macos", "de-DE"],
+        ["de-DE", "fr-FR-windows"],
+        ["fr-FR-windows", "de-DE"],
+      ],
+    ],
+    "should handle cases and underscores, returning the form given in the 'available' list":
+      [
+        [["fr_FR"], ["fr-FR"], ["fr-FR"]],
+        [["fr_fr"], ["fr-FR"], ["fr-FR"]],
+        [["fr_Fr"], ["fr-fR"], ["fr-fR"]],
+        [["fr_lAtN_fr"], ["fr-Latn-FR"], ["fr-Latn-FR"]],
+        [["fr_FR"], ["fr_FR"], ["fr_FR"]],
+        [["fr-FR"], ["fr_FR"], ["fr_FR"]],
+        [["fr_Cyrl_FR_macos"], ["fr_Cyrl_fr-macos"], ["fr_Cyrl_fr-macos"]],
+      ],
+    "should handle mozilla specific 3-letter variants": [
+      [
+        ["ja-JP-mac", "de-DE"],
+        ["ja-JP-mac", "de-DE"],
+        ["ja-JP-mac", "de-DE"],
+      ],
+    ],
+    "should not crash on invalid input": [
+      [["fą-FŻ"], ["ór_Fń"], []],
+      [["2"], ["ąóżł"], []],
+      [[[""]], ["fr-FR"], []],
+    ],
+    "should not match on invalid input": [[["en"], ["ťŮ"], []]],
+  },
+  matching: {
+    "should match only one per requested": [
+      [
+        ["fr", "en"],
+        ["en-US", "fr-FR", "en", "fr"],
+        null,
+        localeService.langNegStrategyMatching,
+        ["fr", "en"],
+      ],
+    ],
+  },
+  lookup: {
+    "should match only one": [
+      [
+        ["fr-FR", "en"],
+        ["en-US", "fr-FR", "en", "fr"],
+        "en-US",
+        localeService.langNegStrategyLookup,
+        ["fr-FR"],
+      ],
+    ],
+  },
+};
+
+function run_test() {
+  const nl = localeService.negotiateLanguages;
+
+  const json = JSON.stringify;
+  for (const strategy in data) {
+    for (const groupName in data[strategy]) {
+      const group = data[strategy][groupName];
+      for (const test of group) {
+        const requested = test[0];
+        const available = test[1];
+        const defaultLocale = test.length > 3 ? test[2] : undefined;
+        const strategyInner = test.length > 4 ? test[3] : undefined;
+        const supported = test[test.length - 1];
+
+        const result = nl(test[0], test[1], defaultLocale, strategyInner);
+        deepEqual(
+          result,
+          supported,
+          `\nExpected ${json(requested)} * ${json(available)} = ${json(
+            supported
+          )}.\n`
+        );
+      }
+    }
+  }
+
+  // Verify that we error out when requested or available is not an array.
+  for (const [req, avail] in [
+    [null, ["fr-FR"]],
+    [undefined, ["fr-FR"]],
+    [2, ["fr-FR"]],
+    ["fr-FR", ["fr-FR"]],
+    [["fr-FR"], null],
+    [["fr-FR"], undefined],
+    [["fr-FR"], 2],
+    [["fr-FR"], "fr-FR"],
+    [[null], []],
+    [[undefined], []],
+    [[undefined], [null]],
+    [[undefined], [undefined]],
+    [[null], [null]],
+    [[[]], [[2]]],
+  ]) {
+    Assert.throws(
+      () => {
+        nl(req, avail);
+      },
+      err => err.result == Cr.NS_ERROR_XPC_CANT_CONVERT_PRIMITIVE_TO_ARRAY
+    );
+  }
+}
diff --git a/intl/locale/tests/unit/test_osPreferences.js b/intl/locale/tests/unit/test_osPreferences.js
new file mode 100644
index 0000000000..6d1bb637ff
--- /dev/null
+++ b/intl/locale/tests/unit/test_osPreferences.js
@@ -0,0 +1,44 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+function run_test() {
+  const osprefs = Cc["@mozilla.org/intl/ospreferences;1"].getService(
+    Ci.mozIOSPreferences
+  );
+
+  const systemLocale = osprefs.systemLocale;
+  Assert.ok(systemLocale != "", "systemLocale is non-empty");
+
+  const systemLocales = osprefs.systemLocales;
+  Assert.ok(Array.isArray(systemLocales), "systemLocales returns an array");
+
+  Assert.ok(
+    systemLocale == systemLocales[0],
+    "systemLocale matches first entry in systemLocales"
+  );
+
+  const rgLocales = osprefs.regionalPrefsLocales;
+  Assert.ok(Array.isArray(rgLocales), "regionalPrefsLocales returns an array");
+
+  const getDateTimePatternTests = [
+    [osprefs.dateTimeFormatStyleNone, osprefs.dateTimeFormatStyleNone, ""],
+    [osprefs.dateTimeFormatStyleShort, osprefs.dateTimeFormatStyleNone, ""],
+    [osprefs.dateTimeFormatStyleNone, osprefs.dateTimeFormatStyleLong, "ar"],
+    [osprefs.dateTimeFormatStyleFull, osprefs.dateTimeFormatStyleMedium, "ru"],
+  ];
+
+  for (let i = 0; i < getDateTimePatternTests.length; i++) {
+    const test = getDateTimePatternTests[i];
+
+    const pattern = osprefs.getDateTimePattern(...test);
+    if (
+      test[0] !== osprefs.dateTimeFormatStyleNone &&
+      test[1] !== osprefs.dateTImeFormatStyleNone
+    ) {
+      Assert.greater(pattern.length, 0, "pattern is not empty.");
+    }
+  }
+
+  Assert.ok(1, "osprefs didn't crash");
+}
diff --git a/intl/locale/tests/unit/test_pluralForm.js b/intl/locale/tests/unit/test_pluralForm.js
new file mode 100644
index 0000000000..e7717d20c1
--- /dev/null
+++ b/intl/locale/tests/unit/test_pluralForm.js
@@ -0,0 +1,390 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Make sure each of the plural forms have the correct number of forms and
+ * match up in functionality.
+ */
+
+const { PluralForm } = ChromeUtils.importESModule(
+  "resource://gre/modules/PluralForm.sys.mjs"
+);
+
+function run_test() {
+  let allExpect = [
+    [
+      // 0: Chinese 0-9, 10-19, ..., 90-99
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      // 100-109, 110-119, ..., 190-199
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      // 200-209, 210-219, ..., 290-299
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    ],
+    [
+      // 1: English 0-9, 10-19, ..., 90-99
+      2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      // 100-109, 110-119, ..., 190-199
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      // 200-209, 210-219, ..., 290-299
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+    ],
+    [
+      // 2: French 0-9, 10-19, ..., 90-99
+      1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      // 100-109, 110-119, ..., 190-199
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      // 200-209, 210-219, ..., 290-299
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+    ],
+    [
+      // 3: Latvian 0-9, 10-19, ..., 90-99
+      1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3,
+      3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3,
+      1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3,
+      3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3,
+      // 100-109, 110-119, ..., 190-199
+      1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3,
+      3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3,
+      1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3,
+      3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3,
+      // 200-209, 210-219, ..., 290-299
+      1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3,
+      3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3,
+      1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3,
+      3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3,
+    ],
+    [
+      // 4: Scottish Gaelic 0-9, 10-19, ..., 90-99
+      4, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      // 100-109, 110-119, ..., 190-199
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      // 200-209, 210-219, ..., 290-299
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+    ],
+    [
+      // 5: Romanian 0-9, 10-19, ..., 90-99
+      2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      // 100-109, 110-119, ..., 190-199
+      3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      // 200-209, 210-219, ..., 290-299
+      3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+    ],
+    [
+      // 6: Lithuanian 0-9, 10-19, ..., 90-99
+      2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 3, 3, 3,
+      3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3,
+      2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 3, 3, 3,
+      3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3,
+      // 100-109, 110-119, ..., 190-199
+      2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 3, 3, 3,
+      3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3,
+      2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 3, 3, 3,
+      3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3,
+      // 200-209, 210-219, ..., 290-299
+      2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 3, 3, 3,
+      3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3,
+      2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 3, 3, 3,
+      3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 3, 3, 3, 3, 3, 3, 3, 3,
+    ],
+    [
+      // 7: Russian 0-9, 10-19, ..., 90-99
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3,
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3,
+      // 100-109, 110-119, ..., 190-199
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3,
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3,
+      // 200-209, 210-219, ..., 290-299
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3,
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3,
+    ],
+    [
+      // 8: Slovak 0-9, 10-19, ..., 90-99
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      // 100-109, 110-119, ..., 190-199
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      // 200-209, 210-219, ..., 290-299
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+    ],
+    [
+      // 9: Polish 0-9, 10-19, ..., 90-99
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3,
+      3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3,
+      // 100-109, 110-119, ..., 190-199
+      3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3,
+      3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3,
+      // 200-209, 210-219, ..., 290-299
+      3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3,
+      3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 3, 3, 3, 3,
+    ],
+    [
+      // 10: Slovenian 0-9, 10-19, ..., 90-99
+      4, 1, 2, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      // 100-109, 110-119, ..., 190-199
+      4, 1, 2, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      // 200-209, 210-219, ..., 290-299
+      4, 1, 2, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+    ],
+    [
+      // 11: Irish Gaeilge 0-9, 10-19, ..., 90-99
+      5, 1, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      // 100-109, 110-119, ..., 190-199
+      5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      // 200-209, 210-219, ..., 290-299
+      5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+    ],
+    [
+      // 12: Arabic 0-9, 10-19, ..., 90-99
+      6, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      // 100-109, 110-119, ..., 190-199
+      5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      // 200-209, 210-219, ..., 290-299
+      5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+    ],
+    [
+      // 13: Maltese 0-9, 10-19, ..., 90-99
+      2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      // 100-109, 110-119, ..., 190-199
+      4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      // 200-209, 210-219, ..., 290-299
+      4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+      4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+    ],
+    [
+      // 14: Unused 0-9, 10-19, ..., 90-99
+      3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3,
+      3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3,
+      3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3,
+      3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3,
+      // 100-109, 110-119, ..., 190-199
+      3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3,
+      3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3,
+      3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3,
+      3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3,
+      // 200-209, 210-219, ..., 290-299
+      3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3,
+      3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3,
+      3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3,
+      3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 3, 3, 3, 3, 3, 3, 3,
+    ],
+    [
+      // 15: Icelandic, Macedonian 0-9, 10-19, ..., 90-99
+      2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2,
+      // 100-109, 110-119, ..., 190-199
+      2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2,
+      // 200-209, 210-219, ..., 290-299
+      2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2,
+    ],
+    [
+      // 16: Breton 0-9, 10-19, ..., 90-99
+      5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 2, 3, 3,
+      5, 5, 5, 5, 3, 5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 1, 2, 3, 3, 5, 5, 5, 5, 3,
+      5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 5, 5, 5, 5,
+      5, 5, 5, 5, 5, 5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      // 100-109, 110-119, ..., 190-199
+      5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 2, 3, 3,
+      5, 5, 5, 5, 3, 5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 1, 2, 3, 3, 5, 5, 5, 5, 3,
+      5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 5, 5, 5, 5,
+      5, 5, 5, 5, 5, 5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+      // 200-209, 210-219, ..., 290-299
+      5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 2, 3, 3,
+      5, 5, 5, 5, 3, 5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 1, 2, 3, 3, 5, 5, 5, 5, 3,
+      5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 5, 5, 5, 5,
+      5, 5, 5, 5, 5, 5, 1, 2, 3, 3, 5, 5, 5, 5, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+    ],
+    [
+      // 17: Shuar 0-9, 10-19, ..., 90-99
+      1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      // 100-109, 110-119, ..., 190-199
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      // 200-209, 210-219, ..., 290-299
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+    ],
+    [
+      // 18: Welsh 0-9, 10-19, ..., 90-99
+      1, 2, 3, 4, 6, 6, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+      6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+      6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+      6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+      // 100-109, 110-119, ..., 190-199
+      6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+      6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+      6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+      6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+      // 200-209, 210-219, ..., 290-299
+      6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+      6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+      6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+      6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    ],
+    [
+      // 19: Slavic languages (bs, hr, sr) 0-9, 10-19, ..., 90-99
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3,
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3,
+      // 100-109, 110-119, ..., 190-199
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3,
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3,
+      // 200-209, 210-219, ..., 290-299
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3,
+      3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2,
+      3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 3, 3, 3, 3, 3,
+    ],
+  ];
+
+  for (let [rule, expect] of allExpect.entries()) {
+    print("\nTesting rule #" + rule);
+
+    let [get, numForms] = PluralForm.makeGetter(rule);
+
+    // Make sure the largest value expected matches the number of plural forms
+    let maxExpect = Math.max.apply(this, expect);
+    Assert.equal(maxExpect, numForms());
+
+    // Make a string of numbers, e.g., 1;2;3;4;5
+    let words = [];
+    for (let i = 1; i <= maxExpect; i++) {
+      words.push(i);
+    }
+    words = words.join(";");
+
+    // Make sure we get the expected number
+    for (let [index, number] of expect.entries()) {
+      print(
+        [
+          "Plural form of ",
+          index,
+          " should be ",
+          number,
+          " (",
+          words,
+          ")",
+        ].join("")
+      );
+      Assert.equal(get(index, words), number);
+    }
+  }
+}
diff --git a/intl/locale/tests/unit/test_pluralForm_english.js b/intl/locale/tests/unit/test_pluralForm_english.js
new file mode 100644
index 0000000000..7ad221e885
--- /dev/null
+++ b/intl/locale/tests/unit/test_pluralForm_english.js
@@ -0,0 +1,31 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * This unit test makes sure the plural form for the default language (by
+ * development), English, is working for the PluralForm javascript module.
+ */
+
+const { PluralForm } = ChromeUtils.importESModule(
+  "resource://gre/modules/PluralForm.sys.mjs"
+);
+
+function run_test() {
+  // English has 2 plural forms
+  Assert.equal(2, PluralForm.numForms());
+
+  // Make sure for good inputs, things work as expected
+  for (var num = 0; num <= 200; num++) {
+    Assert.equal(
+      num == 1 ? "word" : "words",
+      PluralForm.get(num, "word;words")
+    );
+  }
+
+  // Not having enough plural forms defaults to the first form
+  Assert.equal("word", PluralForm.get(2, "word"));
+
+  // Empty forms defaults to the first form
+  Assert.equal("word", PluralForm.get(2, "word;"));
+}
diff --git a/intl/locale/tests/unit/test_pluralForm_makeGetter.js b/intl/locale/tests/unit/test_pluralForm_makeGetter.js
new file mode 100644
index 0000000000..0a5ec28f69
--- /dev/null
+++ b/intl/locale/tests/unit/test_pluralForm_makeGetter.js
@@ -0,0 +1,38 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * This unit test makes sure the plural form for Irish Gaeilge is working by
+ * using the makeGetter method instead of using the default language (by
+ * development), English.
+ */
+
+const { PluralForm } = ChromeUtils.importESModule(
+  "resource://gre/modules/PluralForm.sys.mjs"
+);
+
+function run_test() {
+  // Irish is plural rule #11
+  let [get, numForms] = PluralForm.makeGetter(11);
+
+  // Irish has 5 plural forms
+  Assert.equal(5, numForms());
+
+  // I don't really know Irish, so I'll stick in some dummy text
+  let words = "is 1;is 2;is 3-6;is 7-10;everything else";
+
+  let test = function (text, low, high) {
+    for (let num = low; num <= high; num++) {
+      Assert.equal(text, get(num, words));
+    }
+  };
+
+  // Make sure for good inputs, things work as expected
+  test("everything else", 0, 0);
+  test("is 1", 1, 1);
+  test("is 2", 2, 2);
+  test("is 3-6", 3, 6);
+  test("is 7-10", 7, 10);
+  test("everything else", 11, 200);
+}
diff --git a/intl/locale/tests/unit/xpcshell.ini b/intl/locale/tests/unit/xpcshell.ini
new file mode 100644
index 0000000000..1b213949a1
--- /dev/null
+++ b/intl/locale/tests/unit/xpcshell.ini
@@ -0,0 +1,21 @@
+[DEFAULT]
+head = 
+support-files =
+  data/intl_on_workers_worker.js
+  data/chrome.manifest
+
+[test_bug22310.js]
+skip-if = toolkit != "windows" && toolkit != "cocoa"
+
+[test_bug1086527.js]
+[test_intl_on_workers.js]
+skip-if = toolkit == "android" # bug 1309447
+[test_langPackMatcher.js]
+[test_pluralForm.js]
+[test_pluralForm_english.js]
+[test_pluralForm_makeGetter.js]
+
+[test_osPreferences.js]
+skip-if = toolkit == "android" # bug 1344596
+[test_localeService.js]
+[test_localeService_negotiateLanguages.js]