get-writer-error-message.html | Explore in Territory

<!DOCTYPE html>
<meta charset="utf-8">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
// These are regression tests for
// https://bugs.chromium.org/p/chromium/issues/detail?id=803008. Checking the
// message text of exceptions is not normally good practice but here it is the
// only way to verify that the bug is fixed.

test(() => {
  const ws = new WritableStream();
  ws.getWriter();
  let error;
  try {
    ws.getWriter();
  } catch (e) {
    error = e;
  }
  assert_not_equals(error, undefined);
  assert_equals(
      error.message,
      'Failed to execute \'getWriter\' on \'WritableStream\': Cannot ' +
          'create writer when WritableStream is locked',
      'message should be relevant');
}, 'getWriter on locked WritableStream should have an appropriate message');
</script>

chromium/third_party/blink/web_tests/http/tests/streams/chromium/get-writer-error-message.html