1 files changed, 43 insertions, 0 deletions
diff --git a/mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/LocaleTest.kt b/mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/LocaleTest.kt
new file mode 100644
index 0000000000..69deac1c89
--- /dev/null
+++ b/mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/LocaleTest.kt
@@ -0,0 +1,43 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
+ * Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+package org.mozilla.geckoview.test
+
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.MediumTest
+import org.hamcrest.Matchers.* // ktlint-disable no-wildcard-imports
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@MediumTest
+@RunWith(AndroidJUnit4::class)
+class LocaleTest : BaseSessionTest() {
+
+    @Test fun setLocale() {
+        sessionRule.runtime.settings.setLocales(arrayOf("en-GB"))
+        assertThat(
+            "Requested locale is found",
+            sessionRule.requestedLocales.indexOf("en-GB"),
+            greaterThanOrEqualTo(0),
+        )
+    }
+
+    @Test fun duplicateLocales() {
+        sessionRule.runtime.settings.setLocales(arrayOf("en-gb", "en-US", "en-gb", "en-fr", "en-us", "en-FR"))
+        assertThat(
+            "Locales have no duplicates",
+            sessionRule.requestedLocales,
+            equalTo(listOf("en-GB", "en-US", "en-FR")),
+        )
+    }
+
+    @Test fun lowerCaseToUpperCaseLocales() {
+        sessionRule.runtime.settings.setLocales(arrayOf("en-gb", "en-us", "en-fr"))
+        assertThat(
+            "Locales are formatted properly",
+            sessionRule.requestedLocales,
+            equalTo(listOf("en-GB", "en-US", "en-FR")),
+        )
+    }
+}