1 files changed, 41 insertions, 0 deletions
diff --git a/toolkit/components/extensions/test/xpcshell/test_ext_background_window_properties.js b/toolkit/components/extensions/test/xpcshell/test_ext_background_window_properties.js
new file mode 100644
index 0000000000..fb2ca27482
--- /dev/null
+++ b/toolkit/components/extensions/test/xpcshell/test_ext_background_window_properties.js
@@ -0,0 +1,41 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+add_task(async function testBackgroundWindowProperties() {
+  let extension = ExtensionTestUtils.loadExtension({
+    background() {
+      let expectedValues = {
+        screenX: 0,
+        screenY: 0,
+        outerWidth: 0,
+        outerHeight: 0,
+      };
+
+      for (let k in window) {
+        try {
+          if (k in expectedValues) {
+            browser.test.assertEq(
+              expectedValues[k],
+              window[k],
+              `should return the expected value for window property: ${k}`
+            );
+          } else {
+            void window[k];
+          }
+        } catch (e) {
+          browser.test.assertEq(
+            null,
+            e,
+            `unexpected exception accessing window property: ${k}`
+          );
+        }
+      }
+
+      browser.test.notifyPass("background.testWindowProperties.done");
+    },
+  });
+  await extension.startup();
+  await extension.awaitFinish("background.testWindowProperties.done");
+  await extension.unload();
+});