test_syntaxErrorAsync.html

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<!DOCTYPE html>

<meta charset=utf-8>

<title>Test syntax errors parsing an async module are reported</title>

<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>

<script>

  var wasRun = false;

  var errorCount = 0;

  var syntaxErrorCount = 0;

  var eventCount = 0;

  SimpleTest.waitForExplicitFinish();

  window.onerror = handleError;

  function handleError(message, url, line, column, error) {

    errorCount++;

    if (error instanceof SyntaxError) {

      syntaxErrorCount++;

  function testError() {

    ok(!wasRun, 'Check script was not run');

    ok(errorCount == 1, 'Check that an error was reported');

    ok(syntaxErrorCount == 1, 'Check that a syntax error was reported');

    ok(eventCount == 0, 'Check that no error event was fired');

    SimpleTest.finish();

</script>

<script type="module" src="module_badSyntax.mjs" async onerror="eventCount++"></script>

<body onload='testError()'></body>