response-json-not-affected-by-substitution.html

<html>
<body>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script>

var test = async_test("Test setting the JSON object to undefined doesn't break XMLHttpRequest for responseType='json'.");
test.step(function() {
    assert_equals("hello", window.JSON.parse('"hello"'));
    window.JSON = undefined;

    var xhr = new XMLHttpRequest;
    xhr.responseType = 'json';
    xhr.open('GET', 'resources/test.json', true);
    xhr.onreadystatechange = test.step_func(function() {
        if (xhr.readyState != 4)
            return;

        assert_equals(xhr.status, 200, 'xhr.status');

        assert_equals(xhr.response.length, 4, 'xhr.response.length')
        assert_equals(xhr.response[0], 'a', 'xhr.response[0]');

        test.done();
    });
    xhr.send();
});

</script>
</body>
</html>

chromium/third_party/blink/web_tests/http/tests/xmlhttprequest/response-json-not-affected-by-substitution.html