1 files changed, 24 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-message-run-to-completion.js b/devtools/client/debugger/test/mochitest/browser_dbg-message-run-to-completion.js
new file mode 100644
index 0000000000..a168c9233d
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-message-run-to-completion.js
@@ -0,0 +1,24 @@
+/* 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/>. */
+
+// Test that messages from postMessage calls are not delivered while paused in
+// the debugger.
+
+"use strict";
+
+add_task(async function () {
+  const dbg = await initDebugger("doc-message-run-to-completion.html");
+  invokeInTab("test", "doc-message-run-to-completion.html");
+  await waitForPaused(dbg);
+  let result = await dbg.client.evaluate("event.data");
+  is(result.result, "first", "first message delivered in order");
+  await resume(dbg);
+  await waitForPaused(dbg);
+  result = await dbg.client.evaluate("event.data");
+  is(result.result, "second", "second message delivered in order");
+  await resume(dbg);
+  await waitForPaused(dbg);
+  result = await dbg.client.evaluate("event.data");
+  is(result.result, "third", "third message delivered in order");
+});