third_party/web_platform_tests/fetch/api/response/response-stream-disturbed-1.html

<!doctype html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Consuming Response body after getting a ReadableStream</title>
    <meta name="help" href="https://fetch.spec.whatwg.org/#response">
    <meta name="help" href="https://fetch.spec.whatwg.org/#body-mixin">
    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <body>
    <script>

function createResponseWithReadableStream(callback) {
    return fetch("../resources/data.json").then(function(response) {
        var reader = response.body.getReader();
        reader.releaseLock();
        return callback(response);
    });
}

promise_test(function() {
    return createResponseWithReadableStream(function(response) {
        if ('blob' in response) {
            return response.blob().then(function(blob) {
                assert_true(blob instanceof Blob);
            });
        }
    });
}, "Getting blob after getting the Response body - not disturbed, not locked");

promise_test(function() {
    return createResponseWithReadableStream(function(response) {
        return response.text().then(function(text) {
            assert_true(text.length > 0);
        });
    });
}, "Getting text after getting the Response body - not disturbed, not locked");

promise_test(function() {
    return createResponseWithReadableStream(function(response) {
        return response.json().then(function(json) {
            assert_true(typeof json === "object");
        });
    });
}, "Getting json after getting the Response body - not disturbed, not locked");

promise_test(function() {
    return createResponseWithReadableStream(function(response) {
        return response.arrayBuffer().then(function(arrayBuffer) {
            assert_true(arrayBuffer.byteLength > 0);
        });
    });
}, "Getting arrayBuffer after getting the Response body - not disturbed, not locked");

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