1 files changed, 48 insertions, 0 deletions
diff --git a/devtools/client/webconsole/test/browser/browser_webconsole_strict_mode_errors.js b/devtools/client/webconsole/test/browser/browser_webconsole_strict_mode_errors.js
new file mode 100644
index 0000000000..0894f4f6df
--- /dev/null
+++ b/devtools/client/webconsole/test/browser/browser_webconsole_strict_mode_errors.js
@@ -0,0 +1,48 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Check that "use strict" JS errors generate errors, not warnings.
+
+"use strict";
+
+add_task(async function () {
+  const hud = await openNewTabAndConsole(
+    "data:text/html;charset=utf8,<!DOCTYPE html>empty page"
+  );
+
+  await loadScriptURI("'use strict';var arguments;");
+  await waitForError(
+    hud,
+    "SyntaxError: 'arguments' can't be defined or assigned to in strict mode code"
+  );
+
+  await loadScriptURI("'use strict';function f(a, a) {};");
+  await waitForError(hud, "SyntaxError: duplicate formal argument a");
+
+  await loadScriptURI("'use strict';var o = {get p() {}};o.p = 1;");
+  await waitForError(hud, 'TypeError: setting getter-only property "p"');
+
+  await loadScriptURI("'use strict';v = 1;");
+  await waitForError(
+    hud,
+    "ReferenceError: assignment to undeclared variable v"
+  );
+});
+
+async function waitForError(hud, text) {
+  await waitFor(() => findErrorMessage(hud, text));
+  ok(true, "Received expected error message");
+}
+
+function loadScriptURI(script) {
+  // On e10s, the exception is triggered in child process
+  // and is ignored by test harness
+  if (!Services.appinfo.browserTabsRemoteAutostart) {
+    expectUncaughtException();
+  }
+  const uri =
+    "data:text/html;charset=utf8,<!DOCTYPE html><script>" +
+    script +
+    "</script>";
+  return navigateTo(uri);
+}