1 files changed, 40 insertions, 0 deletions
diff --git a/comm/mail/components/unifiedtoolbar/test/unit/test_buttonStyle.js b/comm/mail/components/unifiedtoolbar/test/unit/test_buttonStyle.js
new file mode 100644
index 0000000000..0ffeefa00b
--- /dev/null
+++ b/comm/mail/components/unifiedtoolbar/test/unit/test_buttonStyle.js
@@ -0,0 +1,40 @@
+/* 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 { BUTTON_STYLE_MAP, BUTTON_STYLE_PREF } = ChromeUtils.importESModule(
+  "resource:///modules/ButtonStyle.mjs"
+);
+
+add_task(function test_buttonStyleMap() {
+  Assert.ok(Array.isArray(BUTTON_STYLE_MAP), "BUTTON_STYLE_MAP is an array");
+  Assert.ok(
+    BUTTON_STYLE_MAP.every(style => typeof style === "string"),
+    "All entries in the style map should be strings"
+  );
+  for (const style of BUTTON_STYLE_MAP) {
+    Assert.stringMatches(
+      style,
+      /[a-z-]/,
+      "Button style class should be formatted in kebab case"
+    );
+  }
+});
+
+add_task(function test_buttonStylePref() {
+  Assert.equal(
+    typeof BUTTON_STYLE_PREF,
+    "string",
+    "BUTTON_STYLE_PREF is a string"
+  );
+  const prefValue = Services.prefs.getIntPref(BUTTON_STYLE_PREF, 0);
+  Assert.ok(
+    Number.isInteger(prefValue),
+    "BUTTON_STYLE_PREF pref should hold an integer"
+  );
+  Assert.less(
+    prefValue,
+    BUTTON_STYLE_MAP.length,
+    "Value of BUTTON_STYLE_PREF should be within map"
+  );
+});