1 files changed, 31 insertions, 0 deletions
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;"));
+}