Implement author-constructible ReadableStream using V8 extras

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

+'use strict';
+
+if (self.importScripts) {
+  self.importScripts('../resources/rs-utils.js');
+  self.importScripts('/resources/testharness.js');
+}
+
+test(function() {
+    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.
+    var x;
+    new ReadableStream(x) // ReadableStream constructed with an undefined variable as parameter.
+}, 'ReadableStream can be constructed with no errors');
+
+test(function() {
+    assert_throws(new TypeError(), function() { new ReadableStream(null); }, 'constructor should throw when the source is null');
+}, 'ReadableStream can\'t be constructed with garbage');
+
+test(function() {
+    var methods = ['cancel', 'constructor', 'getReader', 'tee'];
+    var properties = methods.concat(['locked']).sort();
+
+    var rs = new ReadableStream();
+    var proto = Object.getPrototypeOf(rs);
+
+    assert_array_equals(Object.getOwnPropertyNames(proto).sort(), properties, 'should have all the correct methods');
+
+    for (var m of methods) {
+        var 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', 'should have be a method');
+    }
+
+    var 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(function() {
+    assert_throws(new TypeError(), function() {
+        new ReadableStream({ start: 'potato'});
+    }, 'constructor should throw when start is not a function');
+}, 'ReadableStream constructor should throw for non-function start arguments');
+
+test(function() {
+    new ReadableStream({ cancel: '2'}); // Constructor should not throw when cancel is not a function.
+}, 'ReadableStream constructor can get initial garbage as cancel argument');
+
+test(function() {
+    new ReadableStream({ pull: { } }); // Constructor should not throw when pull is not a function.
+}, 'ReadableStream constructor can get initial garbage as pull argument');
+
+test(function() {
+    var startCalled = false;
+    var source = {
+        start: function(controller) {
+            assert_equals(this, source, 'source is this during start');
+
+            var methods = ['close', 'enqueue', 'error', 'constructor'];
+            var properties = ['desiredSize'].concat(methods).sort();
+            var proto = Object.getPrototypeOf(controller);
+
+            assert_array_equals(Object.getOwnPropertyNames(proto).sort(), properties,
+                                'the controller should have the right properties');
+
+            for (var m of methods) {
+                var 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");
+            }
+
+            var 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(function() {
+    var startCalled = false;
+    var source = {
+        start: function(controller) {
+            var 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;
+        }
+    };
+
+    var rs = new ReadableStream(source);
+    assert_true(startCalled);
+}, 'ReadableStream start controller parameter should be extensible');
+
+var test1 = async_test('ReadableStream should be able to call start method within prototype chain of its source');
+test1.step(function()
+{
+    function SimpleStreamSource() {
+    };
+    SimpleStreamSource.prototype = {
+        start: function() {
+            test1.done('start should be called');
+        },
+    }
+
+    new ReadableStream(new SimpleStreamSource());
+});
+
+var test2 = async_test('ReadableStream start should be able to return a promise');
+test2.step(function()
+{
+    var readCalled = false;
+    var rs = new ReadableStream({
+        start: function(c) {
+            return new Promise(test2.step_func(function(resolve, reject) {
+                setTimeout(test2.step_func(function() {
+                    c.enqueue('a');
+                    c.close();
+                    resolve();
+                }), 500);
+            }));
+        },
+    });
+
+    var reader = rs.getReader();
+
+    reader.read().then(test2.step_func(function(r) {
+        readCalled = true;
+        assert_object_equals(r, { value: 'a', done: false }, 'value read should be the one enqueued');
+    }));
+
+    reader.closed.then(test2.step_func(function() {
+        assert_true(readCalled);
+        test2.done('stream should close successfully');
+    }));
+});
+
+var test3 = async_test('ReadableStream start should be able to return a promise and reject it');
+test3.step(function()
+{
+    var theError = new Error('rejected!');
+    var rs = new ReadableStream({
+        start: function() {
+            return new Promise(test3.step_func(function(resolve, reject) {
+                setTimeout(test3.step_func(function() {
+                    reject(theError);
+                }), 500);
+            }));
+        },
+    });
+
+    rs.getReader().closed.catch(test3.step_func(function(e) {
+        assert_equals(e, theError, 'promise should be rejected with the same error');
+        test3.done();
+    }));
+});
+
+var test4 = async_test('ReadableStream should be able to enqueue different objects.');
+test4.step(function() {
+    var readCalls = 0;
+    var objects = [
+    { potato: 'Give me more!'},
+    'test',
+    1
+    ];
+
+    var rs = new ReadableStream({
+        start: function(c) {
+            for (var o of objects) {
+                c.enqueue(o);
+            }
+            c.close();
+        }
+    });
+
+    var reader = rs.getReader();
+
+    reader.read().then(test4.step_func(function(r) {
+        assert_object_equals(r, { value: objects[readCalls++], done: false }, 'value read should be the one enqueued');
+    }));
+
+    reader.read().then(test4.step_func(function(r) {
+        assert_object_equals(r, { value: objects[readCalls++], done: false }, 'value read should be the one enqueued');
+    }));
+
+    reader.read().then(test4.step_func(function(r) {
+        assert_object_equals(r, { value: objects[readCalls++], done: false }, 'value read should be the one enqueued');
+    }));
+
+    reader.closed.then(test4.step_func(function() {
+        assert_equals(readCalls, 3);
+        test4.done('stream should close correctly correctly');
+    }));
+});
+
+var test5 = async_test('ReadableStream: if pull rejects, it should error the stream');
+test5.step(function() {
+    var error = new Error('pull failure');
+    var rs = new ReadableStream({
+        pull: function() {
+            return Promise.reject(error);
+        }
+    });
+
+    var reader = rs.getReader();
+
+    var closed = false;
+    var read = false;
+
+    reader.closed.catch(test5.step_func(function(e) {
+        closed = true;
+        assert_true(read);
+        assert_equals(e, error, 'closed should reject with the thrown error');
+        test5.done();
+    }));
+
+    reader.read().catch(test5.step_func(function(e) {
+        read = true;
+        assert_false(closed);
+        assert_equals(e, error, 'read() should reject with the thrown error');
+    }));
+});
+
+var test6 = async_test('ReadableStream: should only call pull once upon starting the stream');
+test6.step(function() {
+    var pullCount = 0;
+    var startPromise = Promise.resolve();
+    var rs = new ReadableStream({
+        start: function() {
+            return startPromise;
+        },
+        pull: function() {
+            pullCount++;
+        }
+    });
+
+    startPromise.then(test6.step_func(function() {
+        assert_equals(pullCount, 1, 'pull should be called once start finishes');
+
+        setTimeout(test6.step_func(function() {
+            assert_equals(pullCount, 1, 'pull should be called exactly once');
+            test6.done();
+        }), 1000);
+    }));
+
+});
+
+var test7 = async_test('ReadableStream: should call pull when trying to read from a started, empty stream');
+test7.step(function() {
+    var pullCount = 0;
+    var startPromise = Promise.resolve();
+    var rs = new ReadableStream({
+        start: function() {
+            return startPromise;
+        },
+        pull: function(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;
+        }
+    });
+
+    startPromise.then(test7.step_func(function() {
+        assert_equals(pullCount, 1, 'pull should be called once start finishes');
+
+        var reader = rs.getReader();
+        return reader.read().then(test7.step_func(function(result) {
+            assert_equals(pullCount, 2, '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');
+            test7.done();
+        }));
+    })).catch(test7.step_func(function(e) { assert_unreached(e); }));
+});
+
+var test8 = async_test('ReadableStream: should only call pull once on a non-empty stream read from before start fulfills');
+test8.step(function() {
+    var pullCount = 0;
+    var startPromise = Promise.resolve();
+    var rs = new ReadableStream({
+        start: function(c) {
+            c.enqueue('a');
+            return startPromise;
+        },
+        pull: function() {
+            pullCount++;
+        }
+    });
+
+    startPromise.then(test8.step_func(function() {
+        assert_equals(pullCount, 1, 'pull should be called once start finishes');
+    }));
+
+    rs.getReader().read().then(test8.step_func(function(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');
+
+        setTimeout(test8.step_func(function() {
+            assert_equals(pullCount, 1, 'pull should be called exactly once');
+            test8.done();
+        }), 1000);
+    }));
+
+    assert_equals(pullCount, 0, 'calling read() should not cause pull to be called yet');
+});
+
+var test9 = async_test('ReadableStream: should only call pull once on a non-empty stream read from after start fulfills');
+test9.step(function() {
+    var pullCount = 0;
+    var startPromise = Promise.resolve();
+    var rs = new ReadableStream({
+        start: function(c) {
+            c.enqueue('a');
+            return startPromise;
+        },
+        pull: function() {
+            pullCount++;
+        }
+    });
+
+    startPromise.then(test9.step_func(function() {
+        assert_equals(pullCount, 0, 'pull should not be called once start finishes, since the queue is full');
+
+        rs.getReader().read().then(test9.step_func(function(r) {
+            assert_object_equals(r, { value: 'a', done: false }, 'first read() should return first chunk');
+
+            setTimeout(test9.step_func(function() {
+                assert_equals(pullCount, 1, 'pull should be called exactly once');
+                test9.done();
+            }), 1000);
+
+        }));
+
+        assert_equals(pullCount, 1, 'calling read() should not cause pull to be called immediately');
+    }));
+});
+
+var test10 = async_test('ReadableStream: should call pull in reaction to read()ing the last chunk, if not draining');
+test10.step(function() {
+    var pullCount = 0;
+    var controller;
+    var startPromise = Promise.resolve();
+    var rs = new ReadableStream({
+        start: function(c) {
+            controller = c;
+            return startPromise;
+        },
+        pull: function() {
+            ++pullCount;
+        }
+    });
+
+    var reader = rs.getReader();
+
+    startPromise.then(test10.step_func(function() {
+        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(test10.step_func(function() {
+            assert_equals(pullCount, 2, 'pull should have been called again after read');
+
+            setTimeout(test10.step_func(function() {
+                assert_equals(pullCount, 2, 'pull should be called exactly twice');
+                test10.done();
+            }), 500);
+        }));
+    })).catch(test10.step_func(function(e) { assert_unreached(e); }));
+});
+
+var test11 = async_test('ReadableStream: should not call pull() in reaction to read()ing the last chunk, if draining');
+test11.step(function() {
+    var pullCount = 0;
+    var controller;
+    var startPromise = Promise.resolve();
+    var pullPromise = Promise.resolve();
+    var rs = new ReadableStream({
+        start: function(c) {
+            controller = c;
+            return startPromise;
+        },
+        pull: function() {
+            ++pullCount;
+            return pullPromise;
+        }
+    });
+
+    var reader = rs.getReader();
+
+    startPromise.then(test11.step_func(function() {
+        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(test11.step_func(function() {
+            assert_equals(pullCount, 1, 'pull should not have been called a second time after read');
+
+            setTimeout(test11.step_func(function() {
+                assert_equals(pullCount, 1, 'pull should be called exactly once');
+                test11.done();
+            }), 1000);
+        }));
+    })).catch(test11.step_func(function(e) { assert_unreached(e); }));
+});
+
+var test12 = async_test('ReadableStream: should not call pull until the previous pull call\'s promise fulfills');
+test12.step(function() {
+    var resolve;
+    var returnedPromise;
+    var timesCalled = 0;
+    var startPromise = Promise.resolve();
+    var rs = new ReadableStream({
+        start: function() {
+            return startPromise;
+        },
+        pull: function(c) {
+            c.enqueue(++timesCalled);
+            returnedPromise = new Promise(test12.step_func(function(r) { resolve = r; }));
+            return returnedPromise;
+        }
+    });
+    var reader = rs.getReader();
+
+    startPromise.then(test12.step_func(function() {
+        return reader.read().then(test12.step_func(function(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');
+
+            setTimeout(test12.step_func(function() {
+                assert_equals(timesCalled, 1, 'after 30 ms, pull should still only have been called once');
+
+                resolve();
+
+                returnedPromise.then(test12.step_func(function() {
+                    assert_equals(timesCalled, 2,
+                                  'after the promise returned by pull is fulfilled, pull should be called a second time');
+                    test12.done();
+                }));
+            }), 500);
+        }));
+    })).catch(test12.step_func(function(e) { assert_unreached(e); }));
+});
+
+var test13 = async_test('ReadableStream: should pull after start, and after every read');
+test13.step(function() {
+    var timesCalled = 0;
+    var startPromise = Promise.resolve();
+    var rs = new ReadableStream({
+        start: function(c) {
+            c.enqueue('a');
+            c.enqueue('b');
+            c.enqueue('c');
+            return startPromise;
+        },
+        pull() {
+            ++timesCalled;
+        }
+    },
+    {
+        size: function() {
+            return 1;
+        },
+        highWaterMark: Infinity
+    });
+    var reader = rs.getReader();
+
+    startPromise.then(test13.step_func(function() {
+        return reader.read().then(test13.step_func(function(result1) {
+            assert_object_equals(result1, { value: 'a', done: false }, 'first chunk should be as expected');
+
+            return reader.read().then(test13.step_func(function(result2) {
+                assert_object_equals(result2, { value: 'b', done: false }, 'second chunk should be as expected');
+
+                return reader.read().then(test13.step_func(function(result3) {
+                    assert_object_equals(result3, { value: 'c', done: false }, 'third chunk should be as expected');
+
+                    setTimeout(test13.step_func(function() {
+                        // Once for after start, and once for every read.
+                        assert_equals(timesCalled, 4, 'pull() should be called exactly four times');
+                        test13.done();
+                    }), 1000);
+                }));
+            }));
+        }));
+    })).catch(test13.step_func(function(e) { assert_unreached(e); }));
+});
+
+var test14 = async_test('ReadableStream: should not call pull after start if the stream is now closed');
+test14.step(function() {
+    var timesCalled = 0;
+    var startPromise = Promise.resolve();
+    var rs = new ReadableStream({
+        start: function(c) {
+            c.enqueue('a');
+            c.close();
+            return startPromise;
+        },
+        pull: function() {
+            ++timesCalled;
+        }
+    });
+
+    startPromise.then(test14.step_func(function() {
+        assert_equals(timesCalled, 0, 'after start finishes, pull should not have been called');
+
+        var reader = rs.getReader();
+        return reader.read().then(test14.step_func(function() {
+            assert_equals(timesCalled, 0, 'reading should not have triggered a pull call');
+
+            return reader.closed.then(test14.step_func(function() {
+                assert_equals(timesCalled, 0, 'stream should have closed with still no calls to pull');
+                test14.done();
+            }));
+        }));
+    })).catch(test14.step_func(function(e) { assert_unreached(e); }));
+});
+
+var test15 = async_test('ReadableStream: should call pull after enqueueing from inside pull (with no read requests), if strategy allows');
+test15.step(function() {
+    var timesCalled = 0;
+    var startPromise = Promise.resolve();
+    var rs = new ReadableStream({
+        start: function() {
+            return startPromise;
+        },
+        pull: function(c) {
+            c.enqueue(++timesCalled);
+
+            if (timesCalled == 4) {
+                setTimeout(test15.step_func(function() {
+                    // 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');
+                    test15.done();
+                }), 1000);
+            }
+        }
+    },
+    {
+        size: function() {
+            return 1;
+        },
+        highWaterMark: 4
+    });
+});
+
+var test16 = async_test('ReadableStream pull should be able to close a stream.');
+test16.step(function() {
+    var pullCalled = false;
+    var rs = new ReadableStream({
+        pull: function(c) {
+            pullCalled = true;
+            c.close();
+        }
+    });
+
+    var reader = rs.getReader();
+    reader.closed.then(test16.step_func(function() {
+        assert_true(pullCalled);
+        test16.done('stream was closed successfully');
+    }));
+});
+
+test(function() {
+    var startCalled = false;
+    var rs = new ReadableStream({
+        start: function(c) {
+            assert_equals(c.enqueue('a'), undefined, 'the first enqueue should return undefined');
+            c.close();
+
+            assert_throws(new TypeError(''), function() { 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(function() {
+    var startCalled = false;
+    var rs = new ReadableStream({
+        start: function(c) {
+            c.close();
+
+            assert_throws(new TypeError(), function() { 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(function() {
+    var startCalled = false;
+    var expectedError = new Error('i am sad');
+    var rs = new ReadableStream({
+        start: function(c) {
+            c.error(expectedError);
+
+            assert_throws(expectedError, function() { 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');
+
+var test17 = async_test('ReadableStream: should call underlying source methods as methods');
+test17.step(function() {
+    var startCalled = 0;
+    var pullCalled = 0;
+    var cancelCalled = 0;
+
+    function Source() {
+    }
+
+    Source.prototype = {
+        start: function(c) {
+            startCalled++;
+            assert_equals(this, theSource, 'start() should be called with the correct this');
+            c.enqueue('a');
+        },
+
+        pull: function() {
+            pullCalled++;
+            assert_equals(this, theSource, 'pull() should be called with the correct this');
+        },
+
+        cancel: function() {
+            cancelCalled++;
+            assert_equals(this, theSource, 'cancel() should be called with the correct this');
+        },
+    };
+
+    var theSource = new Source();
+    theSource.debugName = 'the source object passed to the constructor'; // makes test failures easier to diagnose
+    var rs = new ReadableStream(theSource);
+
+    var reader = rs.getReader();
+    reader.read().then(test17.step_func(function() {
+        reader.releaseLock();
+        rs.cancel();
+        assert_equals(startCalled, 1);
+        assert_equals(pullCalled, 1);
+        assert_equals(cancelCalled, 1);
+        test17.done();
+    })).catch(test17.step_func(function(e) { assert_unreached(e); } ));
+});
+
+test(function() {
+    var startCalled = false;
+    new ReadableStream({
+        start: function(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');
+
+var test18 = async_test('ReadableStream strategies: the default strategy should continue giving desiredSize of 1 if the chunks are read immediately');
+test18.step(function() {
+    var controller;
+    var rs = new ReadableStream({
+        start: function(c) {
+            controller = c;
+        }
+    });
+    var 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');
+
+    reader.read().then(test18.step_func(function(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(test18.step_func(function(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(test18.step_func(function(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');
+
+            test18.done();
+    })).catch(test18.step_func(function(e) { assert_unreached(e); }));
+});
+
+var test19 = async_test('ReadableStream integration test: adapting a random push source');
+test19.step(function() {
+    var pullChecked = false;
+    var randomSource = new RandomPushSource(8);
+
+    var rs = new ReadableStream({
+        start: function(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 = test19.step_func(function(chunk) {
+                if (!c.enqueue(chunk) <= 0) {
+                    randomSource.readStop();
+                }
+            });
+
+            randomSource.onend = c.close.bind(c);
+            randomSource.onerror = c.error.bind(c);
+        },
+
+        pull: function(c) {
+            if (!pullChecked) {
+                pullChecked = true;
+                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();
+        }
+    });
+
+    readableStreamToArray(rs).then(test19.step_func(function(chunks) {
+        assert_equals(chunks.length, 8, '8 chunks should be read');
+        for (var i = 0; i < chunks.length; i++) {
+            assert_equals(chunks[i].length, 128, 'chunk should have 128 bytes');
+        }
+
+        test19.done();
+    }), test19.step_func(function(e) { assert_unreached(e); }));
+});
+
+var test20 = async_test('ReadableStream integration test: adapting a sync pull source');
+test20.step(function() {
+    var rs = sequentialReadableStream(10);
+
+    readableStreamToArray(rs).then(test20.step_func(function(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');
+
+        test20.done();
+    }));
+});
+
+var test21 = async_test('ReadableStream integration test: adapting an async pull source');
+test21.step(function() {
+    var rs = sequentialReadableStream(10, { async: true });
+
+    readableStreamToArray(rs).then(test21.step_func(function(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');
+
+        test21.done();
+    }));
+});
+
+done();