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diff --git a/devtools/shared/tests/xpcshell/test_pluralForm-english.js b/devtools/shared/tests/xpcshell/test_pluralForm-english.js
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+++ b/devtools/shared/tests/xpcshell/test_pluralForm-english.js
@@ -0,0 +1,32 @@
+/* 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/. */
+
+"use strict";
+
+/**
+ * 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 } = require("resource://devtools/shared/plural-form.js");
+
+function run_test() {
+  // English has 2 plural forms
+  Assert.equal(2, PluralForm.numForms());
+
+  // Make sure for good inputs, things work as expected
+  for (let 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;"));
+}