1 files changed, 104 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/DisplayNames/language-dialect.js b/js/src/tests/non262/Intl/DisplayNames/language-dialect.js
new file mode 100644
index 0000000000..c2999bd673
--- /dev/null
+++ b/js/src/tests/non262/Intl/DisplayNames/language-dialect.js
@@ -0,0 +1,104 @@
+// |reftest| skip-if(!this.hasOwnProperty('Intl'))
+
+const tests = {
+  "en": {
+    long: {
+      "de": "German",
+      "de-AT": "Austrian German",
+      "de-1996": "German (German orthography of 1996)",
+      "en": "English",
+      "en-Hant-GB": "British English (Traditional)",
+      "en-Hans-US": "American English (Simplified)",
+      "fr": "French",
+      "nl-BE": "Flemish",
+      "cr-Cans": "Cree (Unified Canadian Aboriginal Syllabics)",
+    },
+    short: {
+      "en-Hant-GB": "UK English (Traditional)",
+      "en-Hans-US": "US English (Simplified)",
+      "cr-Cans": "Cree (UCAS)",
+    },
+    narrow: {},
+  },
+  "de": {
+    long: {
+      "de": "Deutsch",
+      "de-AT": "Österreichisches Deutsch",
+      "de-1996": "Deutsch (Neue deutsche Rechtschreibung)",
+      "en": "Englisch",
+      "en-Hant-GB": "Englisch (Traditionell, Vereinigtes Königreich)",
+      "en-Hans-US": "Englisch (Vereinfacht, Vereinigte Staaten)",
+      "fr": "Französisch",
+      "nl-BE": "Flämisch",
+    },
+    short: {
+      "en-Hant-GB": "Englisch (GB) (Traditionell)",
+      "en-Hans-US": "Englisch (USA) (Vereinfacht)",
+    },
+    narrow: {},
+  },
+  "fr": {
+    long: {
+      "de": "allemand",
+      "de-AT": "allemand autrichien",
+      "de-1996": "allemand (orthographe allemande de 1996)",
+      "en": "anglais",
+      "en-Hant-GB": "anglais britannique (traditionnel)",
+      "en-Hans-US": "anglais américain (simplifié)",
+      "fr": "français",
+      "nl-BE": "flamand",
+    },
+    short: {
+      "en-Hant-GB": "anglais britannique (traditionnel)",
+      "en-Hans-US": "anglais américain (simplifié)",
+    },
+    narrow: {},
+  },
+  "zh": {
+    long: {
+      "zh": "中文",
+      "zh-Hant": "繁体中文",
+      "zh-Hant-CN": "繁体中文（中国）",
+      "zh-Hans-HK": "简体中文（中国香港特别行政区）",
+    },
+    short: {
+      "zh-Hans-HK": "简体中文（香港）"
+    },
+    narrow: {},
+  },
+  "ar": {
+    long: {
+      "ar": "العربية",
+      "ar-SA": "العربية (المملكة العربية السعودية)",
+      "zh-MO": "الصينية (منطقة ماكاو الإدارية الخاصة)",
+    },
+    short: {
+      "zh-MO": "الصينية (مكاو)",
+    },
+    narrow: {},
+  },
+};
+
+for (let [locale, localeTests] of Object.entries(tests)) {
+  for (let [style, styleTests] of Object.entries(localeTests)) {
+    let dn = new Intl.DisplayNames(locale, {type: "language", languageDisplay: "dialect", style});
+
+    let resolved = dn.resolvedOptions();
+    assertEq(resolved.locale, locale);
+    assertEq(resolved.style, style);
+    assertEq(resolved.type, "language");
+    assertEq(resolved.languageDisplay, "dialect");
+    assertEq(resolved.fallback, "code");
+
+    let inheritedTests = {...localeTests.long, ...localeTests.short, ...localeTests.narrow};
+    for (let [language, expected] of Object.entries({...inheritedTests, ...styleTests})) {
+      assertEq(dn.of(language), expected);
+
+      // Also works with objects.
+      assertEq(dn.of(Object(language)), expected);
+    }
+  }
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);