1 files changed, 34 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-scopes.js b/devtools/client/debugger/test/mochitest/browser_dbg-scopes.js
new file mode 100644
index 0000000000..0de1e32baa
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-scopes.js
@@ -0,0 +1,34 @@
+/* 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";
+
+add_task(async function () {
+  const dbg = await initDebugger("doc-script-switching.html");
+
+  const ready = Promise.all([
+    waitForPaused(dbg),
+    waitForLoadedSource(dbg, "script-switching-02.js"),
+
+    // MAP_FRAMES triggers a new Scopes panel render cycle, which introduces
+    // a race condition with the click event on the foo node.
+    waitForDispatch(dbg.store, "MAP_FRAMES"),
+  ]);
+  invokeInTab("firstCall");
+  await ready;
+
+  is(getLabel(dbg, 1), "secondCall");
+  is(getLabel(dbg, 2), "<this>");
+  is(getLabel(dbg, 4), "foo()");
+  await toggleScopeNode(dbg, 4);
+  is(getLabel(dbg, 5), "arguments");
+
+  await stepOver(dbg);
+  is(getLabel(dbg, 4), "foo()");
+  is(getLabel(dbg, 5), "Window");
+});
+
+function getLabel(dbg, index) {
+  return findElement(dbg, "scopeNode", index).innerText;
+}