1 files changed, 43 insertions, 0 deletions
diff --git a/devtools/client/webconsole/test/browser/browser_jsterm_await_dynamic_import.js b/devtools/client/webconsole/test/browser/browser_jsterm_await_dynamic_import.js
new file mode 100644
index 0000000000..fae858c8bb
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+++ b/devtools/client/webconsole/test/browser/browser_jsterm_await_dynamic_import.js
@@ -0,0 +1,43 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that top-level await with dynamic import works as expected.
+
+"use strict";
+
+const TEST_URI =
+  "http://example.com/browser/devtools/client/webconsole/test/browser/test-dynamic-import.html";
+
+add_task(async function () {
+  // Enable dynamic import
+  await pushPref("javascript.options.dynamicImport", true);
+  // Enable await mapping.
+  await pushPref("devtools.debugger.features.map-await-expression", true);
+
+  const hud = await openNewTabAndConsole(TEST_URI);
+
+  info("Evaluate an expression with a dynamic import");
+  let importAwaitExpression = `
+    var {sum} = await import("./test-dynamic-import.mjs");
+    sum(1, 2, 3);
+  `;
+  await executeAndWaitForResultMessage(
+    hud,
+    importAwaitExpression,
+    `1 + 2 + 3 = 6`
+  );
+  ok(true, "The `sum` module was imported and used successfully");
+
+  info("Import the same module a second time");
+  // This used to make the content page crash (See Bug 1523897).
+  importAwaitExpression = `
+    var {sum} = await import("./test-dynamic-import.mjs");
+    sum(2, 3, 4);
+  `;
+  await executeAndWaitForResultMessage(
+    hud,
+    importAwaitExpression,
+    `2 + 3 + 4 = 9`
+  );
+  ok(true, "The `sum` module was imported and used successfully a second time");
+});