2 files changed, 43 insertions, 0 deletions
diff --git a/layout/tools/layout-debug/tests/browser/browser.ini b/layout/tools/layout-debug/tests/browser/browser.ini
new file mode 100644
index 0000000000..b732158dc3
--- /dev/null
+++ b/layout/tools/layout-debug/tests/browser/browser.ini
@@ -0,0 +1,2 @@
+[browser_openLayoutDebug.js]
+run-if = debug
diff --git a/layout/tools/layout-debug/tests/browser/browser_openLayoutDebug.js b/layout/tools/layout-debug/tests/browser/browser_openLayoutDebug.js
new file mode 100644
index 0000000000..4402f36a7f
--- /dev/null
+++ b/layout/tools/layout-debug/tests/browser/browser_openLayoutDebug.js
@@ -0,0 +1,41 @@
+"use strict";
+
+/*
+When run locally this won't test whether the files are packaged and available
+in a distributed build unless `./mach mochitest --appname dist` is used
+(after `./mach package`)
+*/
+
+function test() {
+  waitForExplicitFinish();
+
+  const windowListener = {
+    onOpenWindow(win) {
+      info("Observed window open");
+
+      const domWindow = win.docShell.domWindow;
+      waitForFocus(() => {
+        is(
+          domWindow.location.href,
+          "chrome://layoutdebug/content/layoutdebug.xhtml",
+          "Window location is correct"
+        );
+        domWindow.close();
+      }, domWindow);
+    },
+
+    onCloseWindow() {
+      info("Observed window closed");
+      Services.wm.removeListener(this);
+      finish();
+    },
+  };
+  Services.wm.addListener(windowListener);
+
+  const menuitem = document.getElementById("menu_layout_debugger");
+  ok(menuitem, "Menuitem present");
+  if (menuitem) {
+    // open the debugger window
+    menuitem.click();
+  }
+}