Implement author-constructible ReadableStream using V8 extras

third_party/WebKit/LayoutTests/http/tests/streams/readable-streams/general.js

Index: third_party/WebKit/LayoutTests/http/tests/streams/readable-streams/general.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/streams/readable-streams/general.js b/third_party/WebKit/LayoutTests/http/tests/streams/readable-streams/general.js
new file mode 100644
index 0000000000000000000000000000000000000000..b5b24c76f849a9638850357c36e2584a7231493b
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/http/tests/streams/readable-streams/general.js
@@ -0,0 +1,829 @@
+'use strict';
+
+if (self.importScripts) {
+  self.importScripts('../resources/test-utils.js');
+  self.importScripts('../resources/rs-utils.js');
+  self.importScripts('/resources/testharness.js');
+}
+
+test(() => {
+
+  new ReadableStream(); // ReadableStream constructed with no parameters
+  new ReadableStream({ }); // ReadableStream constructed with an empty object as parameter
+  new ReadableStream(undefined); // ReadableStream constructed with undefined as parameter
+
+  let x;
+  new ReadableStream(x); // ReadableStream constructed with an undefined variable as parameter
+
+}, 'ReadableStream can be constructed with no errors');
+
+test(() => {
+
+  assert_throws(new TypeError(), () => new ReadableStream(null), 'constructor should throw when the source is null');
+
+}, 'ReadableStream can\'t be constructed with garbage');
+
+test(() => {
+
+  const methods = ['cancel', 'constructor', 'getReader', 'tee'];
+  const properties = methods.concat(['locked']).sort();
+
+  const rs = new ReadableStream();
+  const proto = Object.getPrototypeOf(rs);
+
+  assert_array_equals(Object.getOwnPropertyNames(proto).sort(), properties, 'should have all the correct methods');
+
+  for (const m of methods) {
+    const propDesc = Object.getOwnPropertyDescriptor(proto, m);
+    assert_false(propDesc.enumerable, 'method should be non-enumerable');
+    assert_true(propDesc.configurable, 'method should be configurable');
+    assert_true(propDesc.writable, 'method should be writable');
+    assert_equals(typeof rs[m], 'function', 'method should be a function');
+  }
+
+  const lockedPropDesc = Object.getOwnPropertyDescriptor(proto, 'locked');
+  assert_false(lockedPropDesc.enumerable, 'locked should be non-enumerable');
+  assert_equals(lockedPropDesc.writable, undefined, 'locked should not be a data property');
+  assert_equals(typeof lockedPropDesc.get, 'function', 'locked should have a getter');
+  assert_equals(lockedPropDesc.set, undefined, 'locked should not have a setter');
+  assert_true(lockedPropDesc.configurable, 'locked should be configurable');
+
+  assert_equals(rs.cancel.length, 1, 'cancel should have 1 parameter');
+  assert_equals(rs.constructor.length, 0, 'constructor should have no parameters');
+  assert_equals(rs.getReader.length, 0, 'getReader should have no parameters');
+  assert_equals(rs.tee.length, 0, 'tee should have no parameters');
+
+}, 'ReadableStream instances should have the correct list of properties');
+
+test(() => {
+
+  assert_throws(new TypeError(), () => {
+    new ReadableStream({ start: 'potato' });
+  }, 'constructor should throw when start is not a function');
+
+}, 'ReadableStream constructor should throw for non-function start arguments');
+
+test(() => {
+
+  new ReadableStream({ cancel: '2' });
+
+}, 'ReadableStream constructor can get initial garbage as cancel argument');
+
+test(() => {
+
+  new ReadableStream({ pull: { } });
+
+}, 'ReadableStream constructor can get initial garbage as pull argument');
+
+test(() => {
+
+  let startCalled = false;
+
+  const source = {
+    start(controller) {
+      assert_equals(this, source, 'source is this during start');
+
+      const methods = ['close', 'enqueue', 'error', 'constructor'];
+      const properties = ['desiredSize'].concat(methods).sort();
+      const proto = Object.getPrototypeOf(controller);
+
+      assert_array_equals(Object.getOwnPropertyNames(proto).sort(), properties,
+        'the controller should have the right properties');
+
+      for (const m of methods) {
+        const propDesc = Object.getOwnPropertyDescriptor(proto, m);
+        assert_equals(typeof controller[m], 'function', `should have a ${m} method`);
+        assert_false(propDesc.enumerable, m + ' should be non-enumerable');
+        assert_true(propDesc.configurable, m + ' should be configurable');
+        assert_true(propDesc.writable, m + ' should be writable');
+      }
+
+      const desiredSizePropDesc = Object.getOwnPropertyDescriptor(proto, 'desiredSize');
+      assert_false(desiredSizePropDesc.enumerable, 'desiredSize should be non-enumerable');
+      assert_equals(desiredSizePropDesc.writable, undefined, 'desiredSize should not be a data property');
+      assert_equals(typeof desiredSizePropDesc.get, 'function', 'desiredSize should have a getter');
+      assert_equals(desiredSizePropDesc.set, undefined, 'desiredSize should not have a setter');
+      assert_true(desiredSizePropDesc.configurable, 'desiredSize should be configurable');
+
+      assert_equals(controller.close.length, 0, 'close should have no parameters');
+      assert_equals(controller.constructor.length, 1, 'constructor should have 1 parameter');
+      assert_equals(controller.enqueue.length, 1, 'enqueue should have 1 parameter');
+      assert_equals(controller.error.length, 1, 'error should have 1 parameter');
+
+      startCalled = true;
+    }
+  };
+
+  new ReadableStream(source);
+  assert_true(startCalled);
+
+}, 'ReadableStream start should be called with the proper parameters');
+
+test(() => {
+
+  let startCalled = false;
+  const source = {
+    start(controller) {
+      const properties = ['close', 'constructor', 'desiredSize', 'enqueue', 'error'];
+      assert_array_equals(Object.getOwnPropertyNames(Object.getPrototypeOf(controller)).sort(), properties,
+        'prototype should have the right properties');
+
+      controller.test = '';
+      assert_array_equals(Object.getOwnPropertyNames(Object.getPrototypeOf(controller)).sort(), properties,
+        'prototype should still have the right properties');
+      assert_not_equals(Object.getOwnPropertyNames(controller).indexOf('test'), -1,
+        '"test" should be a property of the controller');
+
+      startCalled = true;
+    }
+  };
+
+  new ReadableStream(source);
+  assert_true(startCalled);
+
+}, 'ReadableStream start controller parameter should be extensible');
+
+promise_test(() => {
+
+  function SimpleStreamSource() {}
+  let resolve;
+  const promise = new Promise(r => resolve = r);
+  SimpleStreamSource.prototype = {
+    start: resolve
+  };
+
+  new ReadableStream(new SimpleStreamSource());
+  return promise;
+
+}, 'ReadableStream should be able to call start method within prototype chain of its source');
+
+promise_test(() => {
+
+  const rs = new ReadableStream({
+    start(c) {
+      return delay(5).then(() => {
+        c.enqueue('a');
+        c.close();
+      });
+    }
+  });
+
+  const reader = rs.getReader();
+  return reader.read().then(r => {
+    assert_object_equals(r, { value: 'a', done: false }, 'value read should be the one enqueued');
+    return reader.closed;
+  });
+
+}, 'ReadableStream start should be able to return a promise');
+
+promise_test(() => {
+
+  const theError = new Error('rejected!');
+  const rs = new ReadableStream({
+    start() {
+      return delay(1).then(() => { throw theError; });
+    }
+  });
+
+  return rs.getReader().closed.then(() => {
+    assert_unreached('closed promise should be rejected');
+  }, e => {
+    assert_equals(e, theError, 'promise should be rejected with the same error');
+  });
+
+}, 'ReadableStream start should be able to return a promise and reject it');
+
+promise_test(() => {
+
+  const objects = [
+    { potato: 'Give me more!' },
+    'test',
+    1
+  ];
+
+  const rs = new ReadableStream({
+    start(c) {
+      for (const o of objects) {
+        c.enqueue(o);
+      }
+      c.close();
+    }
+  });
+
+  const reader = rs.getReader();
+
+  return Promise.all([reader.read(), reader.read(), reader.read(), reader.closed]).then(r => {
+    assert_object_equals(r[0], { value: objects[0], done: false }, 'value read should be the one enqueued');
+    assert_object_equals(r[1], { value: objects[1], done: false }, 'value read should be the one enqueued');
+    assert_object_equals(r[2], { value: objects[2], done: false }, 'value read should be the one enqueued');
+  });
+
+}, 'ReadableStream should be able to enqueue different objects.');
+
+promise_test(() => {
+
+  const error = new Error('pull failure');
+  const rs = new ReadableStream({
+    pull() {
+      return Promise.reject(error);
+    }
+  });
+
+  const reader = rs.getReader();
+
+  let closed = false;
+  let read = false;
+
+  return Promise.all([
+    reader.closed.then(() => {
+      assert_unreached('closed should be rejected');
+    }, e => {
+      closed = true;
+      assert_true(read);
+      assert_equals(e, error, 'closed should be rejected with the thrown error');
+    }),
+    reader.read().then(() => {
+      assert_unreached('read() should be rejected');
+    }, e => {
+      read = true;
+      assert_false(closed);
+      assert_equals(e, error, 'read() should be rejected with the thrown error');
+    })
+  ]);
+
+}, 'ReadableStream: if pull rejects, it should error the stream');
+
+promise_test(() => {
+
+  let pullCount = 0;
+  const startPromise = Promise.resolve();
+
+  new ReadableStream({
+    start() {
+      return startPromise;
+    },
+    pull() {
+      pullCount++;
+    }
+  });
+
+  return startPromise.then(() => {
+    assert_equals(pullCount, 1, 'pull should be called once start finishes');
+    return delay(10);
+  }).then(() => {
+    assert_equals(pullCount, 1, 'pull should be called exactly once');
+  });
+
+}, 'ReadableStream: should only call pull once upon starting the stream');
+
+promise_test(() => {
+
+  let pullCount = 0;
+
+  const rs = new ReadableStream({
+    pull(c) {
+      // Don't enqueue immediately after start. We want the stream to be empty when we call .read() on it.
+      if (pullCount > 0) {
+        c.enqueue(pullCount);
+      }
+      ++pullCount;
+    }
+  });
+
+  return delay(1).then(() => {
+    assert_equals(pullCount, 1, 'pull should be called once start finishes');
+
+    const reader = rs.getReader();
+    const read = reader.read();
+    assert_equals(pullCount, 2, 'pull should be called when read is called');
+    return read;
+  }).then(result => {
+    assert_equals(pullCount, 3, 'pull should be called again in reaction to calling read');
+    assert_object_equals(result, { value: 1, done: false }, 'the result read should be the one enqueued');
+  });
+
+}, 'ReadableStream: should call pull when trying to read from a started, empty stream');
+
+promise_test(() => {
+
+  let pullCount = 0;
+  const startPromise = Promise.resolve();
+
+  const rs = new ReadableStream({
+    start(c) {
+      c.enqueue('a');
+      return startPromise;
+    },
+    pull() {
+      pullCount++;
+    }
+  });
+
+  const read = rs.getReader().read();
+  assert_equals(pullCount, 0, 'calling read() should not cause pull to be called yet');
+
+  return startPromise.then(() => {
+    assert_equals(pullCount, 1, 'pull should be called once start finishes');
+    return read;
+  }).then(r => {
+    assert_object_equals(r, { value: 'a', done: false }, 'first read() should return first chunk');
+    assert_equals(pullCount, 1, 'pull should not have been called again');
+    return delay(10);
+  }).then(() => {
+    assert_equals(pullCount, 1, 'pull should be called exactly once');
+  });
+
+}, 'ReadableStream: should only call pull once on a non-empty stream read from before start fulfills');
+
+promise_test(() => {
+
+  let pullCount = 0;
+  const startPromise = Promise.resolve();
+
+  const rs = new ReadableStream({
+    start(c) {
+      c.enqueue('a');
+      return startPromise;
+    },
+    pull() {
+      pullCount++;
+    }
+  });
+
+  return startPromise.then(() => {
+    assert_equals(pullCount, 0, 'pull should not be called once start finishes, since the queue is full');
+
+    const read = rs.getReader().read();
+    assert_equals(pullCount, 1, 'calling read() should cause pull to be called immediately');
+    return read;
+  }).then(r => {
+    assert_object_equals(r, { value: 'a', done: false }, 'first read() should return first chunk');
+    return delay(10);
+  }).then(() => {
+    assert_equals(pullCount, 1, 'pull should be called exactly once');
+  });
+
+}, 'ReadableStream: should only call pull once on a non-empty stream read from after start fulfills');
+
+promise_test(() => {
+
+  let pullCount = 0;
+  let controller;
+  const startPromise = Promise.resolve();
+
+  const rs = new ReadableStream({
+    start(c) {
+      controller = c;
+      return startPromise;
+    },
+    pull() {
+      ++pullCount;
+    }
+  });
+
+  const reader = rs.getReader();
+  return startPromise.then(() => {
+    assert_equals(pullCount, 1, 'pull should have been called once by the time the stream starts');
+
+    controller.enqueue('a');
+    assert_equals(pullCount, 1, 'pull should not have been called again after enqueue');
+
+    return reader.read();
+  }).then(() => {
+    assert_equals(pullCount, 2, 'pull should have been called again after read');
+
+    return delay(10);
+  }).then(() => {
+    assert_equals(pullCount, 2, 'pull should be called exactly twice');
+  });
+}, 'ReadableStream: should call pull in reaction to read()ing the last chunk, if not draining');
+
+promise_test(() => {
+
+  let pullCount = 0;
+  let controller;
+  const startPromise = Promise.resolve();
+
+  const rs = new ReadableStream({
+    start(c) {
+      controller = c;
+      return startPromise;
+    },
+    pull() {
+      ++pullCount;
+    }
+  });
+
+  const reader = rs.getReader();
+
+  return startPromise.then(() => {
+    assert_equals(pullCount, 1, 'pull should have been called once by the time the stream starts');
+
+    controller.enqueue('a');
+    assert_equals(pullCount, 1, 'pull should not have been called again after enqueue');
+
+    controller.close();
+
+    return reader.read();
+  }).then(() => {
+    assert_equals(pullCount, 1, 'pull should not have been called a second time after read');
+
+    return delay(10);
+  }).then(() => {
+    assert_equals(pullCount, 1, 'pull should be called exactly once');
+  });
+
+}, 'ReadableStream: should not call pull() in reaction to read()ing the last chunk, if draining');
+
+promise_test(() => {
+
+  let resolve;
+  let returnedPromise;
+  let timesCalled = 0;
+  const startPromise = Promise.resolve();
+
+  const rs = new ReadableStream({
+    start() {
+      return startPromise;
+    },
+    pull(c) {
+      c.enqueue(++timesCalled);
+      returnedPromise = new Promise(r => resolve = r);
+      return returnedPromise;
+    }
+  });
+  const reader = rs.getReader();
+
+  return startPromise.then(() => {
+    return reader.read();
+  }).then(result1 => {
+    assert_equals(timesCalled, 1,
+      'pull should have been called once after start, but not yet have been called a second time');
+    assert_object_equals(result1, { value: 1, done: false }, 'read() should fulfill with the enqueued value');
+
+    return delay(10);
+  }).then(() => {
+    assert_equals(timesCalled, 1, 'after 10 ms, pull should still only have been called once');
+
+    resolve();
+    return returnedPromise;
+  }).then(() => {
+    assert_equals(timesCalled, 2,
+      'after the promise returned by pull is fulfilled, pull should be called a second time');
+  });
+
+}, 'ReadableStream: should not call pull until the previous pull call\'s promise fulfills');
+
+promise_test(() => {
+
+  let timesCalled = 0;
+  const startPromise = Promise.resolve();
+
+  const rs = new ReadableStream(
+    {
+      start(c) {
+        c.enqueue('a');
+        c.enqueue('b');
+        c.enqueue('c');
+        return startPromise;
+      },
+      pull() {
+        ++timesCalled;
+      }
+    },
+    {
+      size() {
+        return 1;
+      },
+      highWaterMark: Infinity
+    }
+  );
+  const reader = rs.getReader();
+
+  return startPromise.then(() => {
+    return reader.read();
+  }).then(result1 => {
+    assert_object_equals(result1, { value: 'a', done: false }, 'first chunk should be as expected');
+
+    return reader.read();
+  }).then(result2 => {
+    assert_object_equals(result2, { value: 'b', done: false }, 'second chunk should be as expected');
+
+    return reader.read();
+  }).then(result3 => {
+    assert_object_equals(result3, { value: 'c', done: false }, 'third chunk should be as expected');
+
+    return delay(10);
+  }).then(() => {
+    // Once for after start, and once for every read.
+    assert_equals(timesCalled, 4, 'pull() should be called exactly four times');
+  });
+
+}, 'ReadableStream: should pull after start, and after every read');
+
+promise_test(() => {
+
+  let timesCalled = 0;
+  const startPromise = Promise.resolve();
+
+  const rs = new ReadableStream({
+    start(c) {
+      c.enqueue('a');
+      c.close();
+      return startPromise;
+    },
+    pull() {
+      ++timesCalled;
+    }
+  });
+
+  const reader = rs.getReader();
+  return startPromise.then(() => {
+    assert_equals(timesCalled, 0, 'after start finishes, pull should not have been called');
+
+    return reader.read();
+  }).then(() => {
+    assert_equals(timesCalled, 0, 'reading should not have triggered a pull call');
+
+    return reader.closed;
+  }).then(() => {
+    assert_equals(timesCalled, 0, 'stream should have closed with still no calls to pull');
+  });
+
+}, 'ReadableStream: should not call pull after start if the stream is now closed');
+
+promise_test(() => {
+
+  let timesCalled = 0;
+  let resolve;
+  const ready = new Promise(r => resolve = r);
+
+  new ReadableStream(
+    {
+      start() {},
+      pull(c) {
+        c.enqueue(++timesCalled);
+
+        if (timesCalled === 4) {
+          resolve();
+        }
+      }
+    },
+    {
+      size() {
+        return 1;
+      },
+      highWaterMark: 4
+    }
+  );
+
+  return ready.then(() => {
+    // after start: size = 0, pull()
+    // after enqueue(1): size = 1, pull()
+    // after enqueue(2): size = 2, pull()
+    // after enqueue(3): size = 3, pull()
+    // after enqueue(4): size = 4, do not pull
+    assert_equals(timesCalled, 4, 'pull() should have been called four times');
+  });
+
+}, 'ReadableStream: should call pull after enqueueing from inside pull (with no read requests), if strategy allows');
+
+promise_test(() => {
+
+  let pullCalled = false;
+
+  const rs = new ReadableStream({
+    pull(c) {
+      pullCalled = true;
+      c.close();
+    }
+  });
+
+  const reader = rs.getReader();
+  return reader.closed.then(() => {
+    assert_true(pullCalled);
+  });
+
+}, 'ReadableStream pull should be able to close a stream.');
+
+test(() => {
+
+  let startCalled = false;
+
+  new ReadableStream({
+    start(c) {
+      assert_equals(c.enqueue('a'), undefined, 'the first enqueue should return undefined');
+      c.close();
+
+      assert_throws(new TypeError(), () => c.enqueue('b'), 'enqueue after close should throw a TypeError');
+      startCalled = true;
+    }
+  });
+
+  assert_true(startCalled);
+
+}, 'ReadableStream: enqueue should throw when the stream is readable but draining');
+
+test(() => {
+
+  let startCalled = false;
+
+  new ReadableStream({
+    start(c) {
+      c.close();
+
+      assert_throws(new TypeError(), () => c.enqueue('a'), 'enqueue after close should throw a TypeError');
+      startCalled = true;
+    }
+  });
+
+  assert_true(startCalled);
+
+}, 'ReadableStream: enqueue should throw when the stream is closed');
+
+test(() => {
+
+  let startCalled = false;
+  const expectedError = new Error('i am sad');
+
+  new ReadableStream({
+    start(c) {
+      c.error(expectedError);
+
+      assert_throws(expectedError, () => c.enqueue('a'), 'enqueue after error should throw that error');
+      startCalled = true;
+    }
+  });
+
+  assert_true(startCalled);
+
+}, 'ReadableStream: enqueue should throw the stored error when the stream is errored');
+
+promise_test(() => {
+
+  let startCalled = 0;
+  let pullCalled = 0;
+  let cancelCalled = 0;
+
+  /* eslint-disable no-use-before-define */
+  class Source {
+    start(c) {
+      startCalled++;
+      assert_equals(this, theSource, 'start() should be called with the correct this');
+      c.enqueue('a');
+    }
+
+    pull() {
+      pullCalled++;
+      assert_equals(this, theSource, 'pull() should be called with the correct this');
+    }
+
+    cancel() {
+      cancelCalled++;
+      assert_equals(this, theSource, 'cancel() should be called with the correct this');
+    }
+  }
+  /* eslint-enable no-use-before-define */
+
+  const theSource = new Source();
+  theSource.debugName = 'the source object passed to the constructor'; // makes test failures easier to diagnose
+
+  const rs = new ReadableStream(theSource);
+  const reader = rs.getReader();
+
+  return reader.read().then(() => {
+    reader.releaseLock();
+    rs.cancel();
+    assert_equals(startCalled, 1);
+    assert_equals(pullCalled, 1);
+    assert_equals(cancelCalled, 1);
+    return rs.getReader().closed;
+  });
+
+}, 'ReadableStream: should call underlying source methods as methods');
+
+test(() => {
+
+  let startCalled = false;
+  new ReadableStream({
+    start(c) {
+      assert_equals(c.desiredSize, 1);
+      c.enqueue('a');
+      assert_equals(c.desiredSize, 0);
+      c.enqueue('b');
+      assert_equals(c.desiredSize, -1);
+      c.enqueue('c');
+      assert_equals(c.desiredSize, -2);
+      c.enqueue('d');
+      assert_equals(c.desiredSize, -3);
+      c.enqueue('e');
+      startCalled = true;
+    }
+  });
+
+  assert_true(startCalled);
+
+}, 'ReadableStream strategies: the default strategy should give desiredSize of 1 to start, decreasing by 1 per enqueue');
+
+promise_test(() => {
+
+  let controller;
+  const rs = new ReadableStream({
+    start(c) {
+      controller = c;
+    }
+  });
+  const reader = rs.getReader();
+
+  assert_equals(controller.desiredSize, 1, 'desiredSize should start at 1');
+  controller.enqueue('a');
+  assert_equals(controller.desiredSize, 0, 'desiredSize should decrease to 0 after first enqueue');
+
+  return reader.read().then(result1 => {
+    assert_object_equals(result1, { value: 'a', done: false }, 'first chunk read should be correct');
+
+    assert_equals(controller.desiredSize, 1, 'desiredSize should go up to 1 after the first read');
+    controller.enqueue('b');
+    assert_equals(controller.desiredSize, 0, 'desiredSize should go down to 0 after the second enqueue');
+
+    return reader.read();
+  }).then(result2 => {
+    assert_object_equals(result2, { value: 'b', done: false }, 'second chunk read should be correct');
+
+    assert_equals(controller.desiredSize, 1, 'desiredSize should go up to 1 after the second read');
+    controller.enqueue('c');
+    assert_equals(controller.desiredSize, 0, 'desiredSize should go down to 0 after the third enqueue');
+
+    return reader.read();
+  }).then(result3 => {
+    assert_object_equals(result3, { value: 'c', done: false }, 'third chunk read should be correct');
+
+    assert_equals(controller.desiredSize, 1, 'desiredSize should go up to 1 after the third read');
+    controller.enqueue('d');
+    assert_equals(controller.desiredSize, 0, 'desiredSize should go down to 0 after the fourth enqueue');
+  });
+
+}, 'ReadableStream strategies: the default strategy should continue giving desiredSize of 1 if the chunks are read immediately');
+
+promise_test(t => {
+
+  const randomSource = new RandomPushSource(8);
+
+  const rs = new ReadableStream({
+    start(c) {
+      assert_equals(typeof c, 'object', 'c should be an object in start');
+      assert_equals(typeof c.enqueue, 'function', 'enqueue should be a function in start');
+      assert_equals(typeof c.close, 'function', 'close should be a function in start');
+      assert_equals(typeof c.error, 'function', 'error should be a function in start');
+
+      randomSource.ondata = t.step_func(chunk => {
+        if (!c.enqueue(chunk) <= 0) {
+          randomSource.readStop();
+        }
+      });
+
+      randomSource.onend = c.close.bind(c);
+      randomSource.onerror = c.error.bind(c);
+    },
+
+    pull(c) {
+      assert_equals(typeof c, 'object', 'c should be an object in pull');
+      assert_equals(typeof c.enqueue, 'function', 'enqueue should be a function in pull');
+      assert_equals(typeof c.close, 'function', 'close should be a function in pull');
+
+      randomSource.readStart();
+    }
+  });
+
+  return readableStreamToArray(rs).then(chunks => {
+    assert_equals(chunks.length, 8, '8 chunks should be read');
+    for (const chunk of chunks) {
+      assert_equals(chunk.length, 128, 'chunk should have 128 bytes');
+    }
+  });
+
+}, 'ReadableStream integration test: adapting a random push source');
+
+promise_test(() => {
+
+  const rs = sequentialReadableStream(10);
+
+  return readableStreamToArray(rs).then(chunks => {
+    assert_true(rs.source.closed, 'source should be closed after all chunks are read');
+    assert_array_equals(chunks, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 'the expected 10 chunks should be read');
+  });
+
+}, 'ReadableStream integration test: adapting a sync pull source');
+
+promise_test(() => {
+
+  const rs = sequentialReadableStream(10, { async: true });
+
+  return readableStreamToArray(rs).then(chunks => {
+    assert_true(rs.source.closed, 'source should be closed after all chunks are read');
+    assert_array_equals(chunks, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 'the expected 10 chunks should be read');
+  });
+
+}, 'ReadableStream integration test: adapting an async pull source');
+
+done();