test_moduleNotFound.html

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<!DOCTYPE html>

<meta charset=utf-8>

<title>Test what happens when a top-level module is not found</title>

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

<script>

  var errorCount = 0;

  var eventCount = 0;

  SimpleTest.waitForExplicitFinish();

  window.onerror = function(_message, _url, _line, _column, _error) {

    errorCount++;

  // eslint-disable-next-line no-unused-vars

  function testError() {

    ok(eventCount == 1, 'Check that an error event was fired');

    ok(errorCount == 0, 'Check that no error was reported');

    SimpleTest.finish();

</script>

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

</script>

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