1 files changed, 39 insertions, 0 deletions
diff --git a/devtools/client/webconsole/test/browser/browser_jsterm_await_concurrent_same_result.js b/devtools/client/webconsole/test/browser/browser_jsterm_await_concurrent_same_result.js
new file mode 100644
index 0000000000..a1a6a0394b
--- /dev/null
+++ b/devtools/client/webconsole/test/browser/browser_jsterm_await_concurrent_same_result.js
@@ -0,0 +1,39 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that hitting Ctrl + E does toggle the editor mode.
+// See https://bugzilla.mozilla.org/show_bug.cgi?id=1519105
+
+"use strict";
+
+const TEST_URI =
+  "data:text/html;charset=utf-8,<!DOCTYPE html>Test concurrent top-level await expressions returning same value";
+
+add_task(async function () {
+  // Enable editor mode as we'll be able to quicly trigger multiple evaluations.
+  await pushPref("devtools.webconsole.input.editor", true);
+
+  const hud = await openNewTabAndConsole(TEST_URI);
+  setInputValue(
+    hud,
+    `await new Promise(res => setTimeout(() => res("foo"), 5000))`
+  );
+
+  info("Evaluate the expression 3 times in a row");
+  const executeButton = hud.ui.outputNode.querySelector(
+    ".webconsole-editor-toolbar-executeButton"
+  );
+
+  executeButton.click();
+  executeButton.click();
+  executeButton.click();
+
+  await waitFor(
+    () => findEvaluationResultMessages(hud, "foo").length === 3,
+    "Waiting for all results to be printed in console",
+    1000
+  );
+  ok(true, "There are as many results as commands");
+
+  Services.prefs.clearUserPref("devtools.webconsole.input.editor");
+});