test_dynamicImportErrorMessage.html

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<!DOCTYPE html>

<meta charset=utf-8>

<title>Test the error message from import()</title>

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

<script>

  SimpleTest.waitForExplicitFinish();

  async function testLoaded() {

    await import("./404.js").catch((error) => {

      ok(error instanceof TypeError, "Should be a TypeError.");

      ok(error.message.match(/404.js/), "Should have the filename.");

      SimpleTest.finish();

});

</script>

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