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86 lines
3.1 KiB
HTML
86 lines
3.1 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title></title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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</head>
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<body>
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<script>
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function performMicrotaskCheckpoint() {
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document.createNodeIterator(document, -1, {
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acceptNode() {
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return NodeFilter.FILTER_ACCEPT;
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}
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}).nextNode();
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}
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promise_test(function() {
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return fetch("../resources/data.json").then(function(response) {
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// Add a getter for "then" that will incidentally be invoked
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// during promise resolution.
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Object.prototype.__defineGetter__('then', () => {
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// Clean up behind ourselves.
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delete Object.prototype.then;
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// This promise should (like all promises) be resolved
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// asynchronously.
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var executed = false;
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Promise.resolve().then(_ => { executed = true; });
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// This shouldn't run microtasks! They should only run
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// after the fetch is resolved.
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performMicrotaskCheckpoint();
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// The fulfill handler above shouldn't have run yet. If it has run,
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// throw to reject this promise and fail the test.
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assert_false(executed, "shouldn't have run microtasks yet");
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// Otherwise act as if there's no "then" property so the promise
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// fulfills and the test passes.
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return undefined;
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});
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// Create a read request, incidentally resolving a promise with an
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// object value, thereby invoking the getter installed above.
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return response.body.getReader().read();
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});
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}, "reading from a body stream should occur in a microtask scope");
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promise_test(function() {
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return fetch("../resources/data.json").then(function(response) {
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// Add a getter for "then" that will incidentally be invoked
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// during promise resolution.
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Object.prototype.__defineGetter__('then', () => {
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// Clean up behind ourselves.
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delete Object.prototype.then;
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// This promise should (like all promises) be resolved
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// asynchronously.
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var executed = false;
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Promise.resolve().then(_ => { executed = true; });
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// This shouldn't run microtasks! They should only run
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// after the fetch is resolved.
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performMicrotaskCheckpoint();
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// The fulfill handler above shouldn't have run yet. If it has run,
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// throw to reject this promise and fail the test.
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assert_false(executed, "shouldn't have run microtasks yet");
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// Otherwise act as if there's no "then" property so the promise
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// fulfills and the test passes.
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return undefined;
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});
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// Create a read request, incidentally resolving a promise with an
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// object value, thereby invoking the getter installed above.
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return response.body.pipeTo(new WritableStream({
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write(chunk) {}
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}))
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});
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}, "piping from a body stream to a JS-written WritableStream should occur in a microtask scope");
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</script>
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</body>
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</html>
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