test_importResolveFailed.html

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<!DOCTYPE html>

<meta charset=utf-8>

<title>Test error thrown when an import cannot be resolved</title>

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

<script>

  var hadTypeError = false;

  SimpleTest.waitForExplicitFinish();

  window.onerror = handleError;

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

    hadTypeError = error instanceof TypeError;

  function testError() {

    ok(hadTypeError, 'Check that a TypeError was thrown');

    SimpleTest.finish();

</script>

<script type="module" src="module_badImport.mjs"></script>

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