1 files changed, 40 insertions, 0 deletions
diff --git a/devtools/client/webconsole/test/browser/browser_console_jsterm_await.js b/devtools/client/webconsole/test/browser/browser_console_jsterm_await.js
new file mode 100644
index 0000000000..501f7dcffd
--- /dev/null
+++ b/devtools/client/webconsole/test/browser/browser_console_jsterm_await.js
@@ -0,0 +1,40 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// This is a lightweight version of browser_jsterm_await.js to only ensure top-level await
+// support in the Browser Console.
+
+"use strict";
+
+const TEST_URI =
+  "data:text/html;charset=utf-8,<!DOCTYPE html>Top-level await Browser Console test";
+
+add_task(async function () {
+  // Needed for the execute() function below
+  await pushPref("security.allow_parent_unrestricted_js_loads", true);
+  // Enable await mapping.
+  await pushPref("devtools.debugger.features.map-await-expression", true);
+
+  await addTab(TEST_URI);
+  const hud = await BrowserConsoleManager.toggleBrowserConsole();
+
+  info("Evaluate a top-level await expression");
+  const simpleAwait = `await new Promise(r => setTimeout(() => r(["await1"]), 500))`;
+  await executeAndWaitForResultMessage(hud, simpleAwait, `Array [ "await1" ]`);
+
+  // Check that the resulting promise of the async iife is not displayed.
+  const messages = hud.ui.outputNode.querySelectorAll(".message .message-body");
+  const messagesText = Array.from(messages)
+    .map(n => n.textContent)
+    .join(" - ");
+  is(
+    messagesText.includes("Promise {"),
+    false,
+    "The output does not contain a Promise"
+  );
+  ok(
+    messagesText.includes(simpleAwait) &&
+      messagesText.includes(`Array [ "await1" ]`),
+    "The output contains the the expected messages"
+  );
+});