Import wpt@40665266227e475bc4a56884247d8c09d78dfb6a

third_party/WebKit/LayoutTests/external/wpt/streams/readable-byte-streams/general.js

Index: third_party/WebKit/LayoutTests/external/wpt/streams/readable-byte-streams/general.js
diff --git a/third_party/WebKit/LayoutTests/external/wpt/streams/readable-byte-streams/general.js b/third_party/WebKit/LayoutTests/external/wpt/streams/readable-byte-streams/general.js
new file mode 100644
index 0000000000000000000000000000000000000000..cefc446dc7546dcf05e6c0f70b26060922d05dda
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/streams/readable-byte-streams/general.js
@@ -0,0 +1,1920 @@
+'use strict';
+
+if (self.importScripts) {
+  self.importScripts('../resources/rs-utils.js');
+  self.importScripts('/resources/testharness.js');
+}
+
+const error1 = new Error('error1');
+error1.name = 'error1';
+
+test(() => {
+  assert_throws(new TypeError(), () => new ReadableStream().getReader({ mode: 'byob' }));
+}, 'getReader({mode: "byob"}) throws on non-bytes streams');
+
+
+test(() => {
+  // Constructing ReadableStream with an empty underlying byte source object as parameter shouldn't throw.
+  new ReadableStream({ type: 'bytes' });
+}, 'ReadableStream with byte source can be constructed with no errors');
+
+promise_test(() => {
+  let startCalled = false;
+  let controller;
+
+  let resolveTestPromise;
+  const testPromise = new Promise(resolve => {
+    resolveTestPromise = resolve;
+  });
+
+  new ReadableStream({
+    start(c) {
+      controller = c;
+      startCalled = true;
+    },
+    pull() {
+      assert_true(startCalled, 'start has been called');
+      assert_equals(controller.desiredSize, 256, 'desiredSize');
+      resolveTestPromise();
+    },
+    type: 'bytes'
+  }, {
+    highWaterMark: 256
+  });
+
+  return testPromise;
+
+}, 'ReadableStream with byte source: Construct and expect start and pull being called');
+
+promise_test(() => {
+  let pullCount = 0;
+  let checkedNoPull = false;
+
+  let resolveTestPromise;
+  const testPromise = new Promise(resolve => {
+    resolveTestPromise = resolve;
+  });
+  let resolveStartPromise;
+
+  new ReadableStream({
+    start() {
+      return new Promise(resolve => {
+        resolveStartPromise = resolve;
+      });
+    },
+    pull() {
+      if (checkedNoPull) {
+        resolveTestPromise();
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes'
+  }, {
+    highWaterMark: 256
+  });
+
+  Promise.resolve().then(() => {
+    assert_equals(pullCount, 0);
+    checkedNoPull = true;
+    resolveStartPromise();
+  });
+
+  return testPromise;
+
+}, 'ReadableStream with byte source: No automatic pull call if start doesn\'t finish');
+
+promise_test(() => {
+  new ReadableStream({
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    type: 'bytes'
+  }, {
+    highWaterMark: 0
+  });
+
+  return Promise.resolve().then(() => {});
+}, 'ReadableStream with byte source: Construct with highWaterMark of 0');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+  reader.releaseLock();
+
+  return promise_rejects(t, new TypeError(), reader.closed, 'closed must reject');
+}, 'ReadableStream with byte source: getReader(), then releaseLock()');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+  reader.releaseLock();
+
+  return promise_rejects(t, new TypeError(), reader.closed, 'closed must reject');
+}, 'ReadableStream with byte source: getReader() with mode set to byob, then releaseLock()');
+
+promise_test(() => {
+  const stream = new ReadableStream({
+    start(c) {
+      c.close();
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  return reader.closed.then(() => {
+    assert_throws(new TypeError(), () => stream.getReader(), 'getReader() must throw');
+  });
+}, 'ReadableStream with byte source: Test that closing a stream does not release a reader automatically');
+
+promise_test(() => {
+  const stream = new ReadableStream({
+    start(c) {
+      c.close();
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.closed.then(() => {
+    assert_throws(new TypeError(), () => stream.getReader({ mode: 'byob' }), 'getReader() must throw');
+  });
+}, 'ReadableStream with byte source: Test that closing a stream does not release a BYOB reader automatically');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    start(c) {
+      c.error(error1);
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  return promise_rejects(t, error1, reader.closed, 'closed must reject').then(() => {
+    assert_throws(new TypeError(), () => stream.getReader(), 'getReader() must throw');
+  });
+}, 'ReadableStream with byte source: Test that erroring a stream does not release a reader automatically');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    start(c) {
+      c.error(error1);
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return promise_rejects(t, error1, reader.closed, 'closed must reject').then(() => {
+    assert_throws(new TypeError(), () => stream.getReader({ mode: 'byob' }), 'getReader() must throw');
+  });
+}, 'ReadableStream with byte source: Test that erroring a stream does not release a BYOB reader automatically');
+
+test(() => {
+  const stream = new ReadableStream({
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+  reader.read();
+  assert_throws(new TypeError(), () => reader.releaseLock(), 'reader.releaseLock() must throw');
+}, 'ReadableStream with byte source: releaseLock() on ReadableStreamReader with pending read() must throw');
+
+promise_test(() => {
+  let pullCount = 0;
+
+  const stream = new ReadableStream({
+    pull() {
+      ++pullCount;
+    },
+    type: 'bytes'
+  }, {
+    highWaterMark: 8
+  });
+
+  stream.getReader();
+
+  assert_equals(pullCount, 0, 'No pull as start() just finished and is not yet reflected to the state of the stream');
+
+  return Promise.resolve().then(() => {
+    assert_equals(pullCount, 1, 'pull must be invoked');
+  });
+}, 'ReadableStream with byte source: Automatic pull() after start()');
+
+promise_test(() => {
+  let pullCount = 0;
+
+  const stream = new ReadableStream({
+    pull() {
+      ++pullCount;
+    },
+    type: 'bytes'
+  }, {
+    highWaterMark: 0
+  });
+
+  const reader = stream.getReader();
+  reader.read();
+
+  assert_equals(pullCount, 0, 'No pull as start() just finished and is not yet reflected to the state of the stream');
+
+  return Promise.resolve().then(() => {
+    assert_equals(pullCount, 1, 'pull must be invoked');
+  });
+}, 'ReadableStream with byte source: Automatic pull() after start() and read()');
+
+promise_test(() => {
+  let pullCount = 0;
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      if (pullCount === 0) {
+        const byobRequest = controller.byobRequest;
+        assert_not_equals(byobRequest, undefined, 'byobRequest must not be undefined');
+
+        const view = byobRequest.view;
+        assert_not_equals(view, undefined, 'byobRequest.view must no be undefined');
+        assert_equals(view.constructor, Uint8Array);
+        assert_equals(view.buffer.byteLength, 16);
+        assert_equals(view.byteOffset, 0);
+        assert_equals(view.byteLength, 16);
+
+        view[0] = 0x01;
+        byobRequest.respond(1);
+      } else {
+        assert_unreached('Too many pull() calls');
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes',
+    autoAllocateChunkSize: 16
+  }, {
+    highWaterMark: 0
+  });
+
+  const reader = stream.getReader();
+  const readPromise = reader.read();
+
+  assert_equals(pullCount, 0, 'No pull() as start() just finished and is not yet reflected to the state of the stream');
+
+  return Promise.resolve().then(() => {
+    assert_equals(pullCount, 1, 'pull() must have been invoked once');
+    return readPromise;
+  }).then(result => {
+    assert_not_equals(result.value, undefined);
+    assert_equals(result.value.constructor, Uint8Array);
+    assert_equals(result.value.buffer.byteLength, 16);
+    assert_equals(result.value.byteOffset, 0);
+    assert_equals(result.value.byteLength, 1);
+    assert_equals(result.value[0], 0x01);
+  });
+}, 'ReadableStream with byte source: autoAllocateChunkSize');
+
+promise_test(() => {
+  let pullCount = 0;
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      if (pullCount === 0) {
+        const byobRequest = controller.byobRequest;
+        assert_not_equals(byobRequest, undefined, 'byobRequest must not be undefined');
+
+        const view = byobRequest.view;
+        assert_not_equals(view, undefined, 'byobRequest.view must no be undefined');
+        assert_equals(view.constructor, Uint8Array);
+        assert_equals(view.buffer.byteLength, 16);
+        assert_equals(view.byteOffset, 0);
+        assert_equals(view.byteLength, 16);
+
+        view[0] = 0x01;
+        byobRequest.respond(1);
+      } else if (pullCount === 1) {
+        const byobRequest = controller.byobRequest;
+        assert_not_equals(byobRequest, undefined, 'byobRequest must not be undefined');
+
+        const view = byobRequest.view;
+        assert_not_equals(view, undefined, 'byobRequest.view must no be undefined');
+        assert_equals(view.constructor, Uint8Array);
+        assert_equals(view.buffer.byteLength, 32);
+        assert_equals(view.byteOffset, 0);
+        assert_equals(view.byteLength, 32);
+
+        view[0] = 0x02;
+        view[1] = 0x03;
+        byobRequest.respond(2);
+      } else {
+        assert_unreached('Too many pull() calls');
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes',
+    autoAllocateChunkSize: 16
+  }, {
+    highWaterMark: 0
+  });
+
+  const reader = stream.getReader();
+  return reader.read().then(result => {
+    assert_not_equals(result.value, undefined);
+    assert_equals(result.value.constructor, Uint8Array);
+    assert_equals(result.value.buffer.byteLength, 16);
+    assert_equals(result.value.byteOffset, 0);
+    assert_equals(result.value.byteLength, 1);
+    assert_equals(result.value[0], 0x01);
+
+    reader.releaseLock();
+    const byobReader = stream.getReader({ mode: 'byob' });
+    return byobReader.read(new Uint8Array(32));
+  }).then(result => {
+    assert_not_equals(result.value, undefined);
+    assert_equals(result.value.constructor, Uint8Array);
+    assert_equals(result.value.buffer.byteLength, 32);
+    assert_equals(result.value.byteOffset, 0);
+    assert_equals(result.value.byteLength, 2);
+    assert_equals(result.value[0], 0x02);
+    assert_equals(result.value[1], 0x03);
+  });
+}, 'ReadableStream with byte source: Mix of auto allocate and BYOB');
+
+promise_test(() => {
+  let pullCount = 0;
+
+  const stream = new ReadableStream({
+    pull() {
+      ++pullCount;
+    },
+    type: 'bytes'
+  }, {
+    highWaterMark: 0
+  });
+
+  const reader = stream.getReader();
+  reader.read(new Uint8Array(8));
+
+  assert_equals(pullCount, 0, 'No pull as start() just finished and is not yet reflected to the state of the stream');
+
+  return Promise.resolve().then(() => {
+    assert_equals(pullCount, 1, 'pull must be invoked');
+  });
+}, 'ReadableStream with byte source: Automatic pull() after start() and read(view)');
+
+promise_test(() => {
+  let pullCount = 0;
+
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      c.enqueue(new Uint8Array(16));
+      assert_equals(c.desiredSize, -8, 'desiredSize after enqueue() in start()');
+
+      controller = c;
+    },
+    pull() {
+      ++pullCount;
+
+      if (pullCount === 1) {
+        assert_equals(controller.desiredSize, 8, 'desiredSize in pull()');
+      }
+    },
+    type: 'bytes'
+  }, {
+    highWaterMark: 8
+  });
+
+  return Promise.resolve().then(() => {
+    assert_equals(pullCount, 0, 'No pull as the queue was filled by start()');
+
+    const reader = stream.getReader();
+
+    const promise = reader.read();
+    assert_equals(pullCount, 1, 'The first pull() should be made on read()');
+
+    return promise.then(result => {
+      assert_equals(result.done, false, 'result.done');
+
+      const view = result.value;
+      assert_equals(view.constructor, Uint8Array, 'view.constructor');
+      assert_equals(view.buffer.byteLength, 16, 'view.buffer');
+      assert_equals(view.byteOffset, 0, 'view.byteOffset');
+      assert_equals(view.byteLength, 16, 'view.byteLength');
+    });
+  });
+}, 'ReadableStream with byte source: enqueue(), getReader(), then read()');
+
+promise_test(() => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  const promise = reader.read().then(result => {
+    assert_equals(result.done, false);
+
+    const view = result.value;
+    assert_equals(view.constructor, Uint8Array);
+    assert_equals(view.buffer.byteLength, 1);
+    assert_equals(view.byteOffset, 0);
+    assert_equals(view.byteLength, 1);
+  });
+
+  controller.enqueue(new Uint8Array(1));
+
+  return promise;
+}, 'ReadableStream with byte source: Push source that doesn\'t understand pull signal');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    pull: 'foo',
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  return promise_rejects(t, new TypeError(), reader.read(), 'read() must fail');
+}, 'ReadableStream with byte source: read(), but pull() function is not callable');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    pull: 'foo',
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return promise_rejects(t, new TypeError(), reader.read(new Uint8Array(1)), 'read() must fail');
+}, 'ReadableStream with byte source: read(view), but pull() function is not callable');
+
+promise_test(() => {
+  const stream = new ReadableStream({
+    start(c) {
+      c.enqueue(new Uint16Array(16));
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  return reader.read().then(result => {
+    assert_equals(result.done, false);
+
+    const view = result.value;
+    assert_equals(view.constructor, Uint8Array);
+    assert_equals(view.buffer.byteLength, 32);
+    assert_equals(view.byteOffset, 0);
+    assert_equals(view.byteLength, 32);
+  });
+}, 'ReadableStream with byte source: enqueue() with Uint16Array, getReader(), then read()');
+
+promise_test(() => {
+  const stream = new ReadableStream({
+    start(c) {
+      const view = new Uint8Array(16);
+      view[0] = 0x01;
+      view[8] = 0x02;
+      c.enqueue(view);
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    type: 'bytes'
+  });
+
+  const byobReader = stream.getReader({ mode: 'byob' });
+
+  return byobReader.read(new Uint8Array(8)).then(result => {
+    assert_equals(result.done, false, 'done');
+
+    const view = result.value;
+    assert_equals(view.constructor, Uint8Array, 'value.constructor');
+    assert_equals(view.buffer.byteLength, 8, 'value.buffer.byteLength');
+    assert_equals(view.byteOffset, 0, 'value.byteOffset');
+    assert_equals(view.byteLength, 8, 'value.byteLength');
+    assert_equals(view[0], 0x01);
+
+    byobReader.releaseLock();
+
+    const reader = stream.getReader();
+
+    return reader.read();
+  }).then(result => {
+    assert_equals(result.done, false, 'done');
+
+    const view = result.value;
+    assert_equals(view.constructor, Uint8Array, 'value.constructor');
+    assert_equals(view.buffer.byteLength, 16, 'value.buffer.byteLength');
+    assert_equals(view.byteOffset, 8, 'value.byteOffset');
+    assert_equals(view.byteLength, 8, 'value.byteLength');
+    assert_equals(view[0], 0x02);
+  });
+}, 'ReadableStream with byte source: enqueue(), read(view) partially, then read()');
+
+promise_test(() => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  controller.enqueue(new Uint8Array(16));
+  controller.close();
+
+  return reader.read().then(result => {
+    assert_equals(result.done, false, 'done');
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0, 'byteOffset');
+    assert_equals(view.byteLength, 16, 'byteLength');
+
+    return reader.read();
+  }).then(result => {
+    assert_equals(result.done, true, 'done');
+    assert_equals(result.value, undefined, 'value');
+  });
+}, 'ReadableStream with byte source: getReader(), enqueue(), close(), then read()');
+
+promise_test(() => {
+  const stream = new ReadableStream({
+    start(c) {
+      c.enqueue(new Uint8Array(16));
+      c.close();
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  return reader.read().then(result => {
+    assert_equals(result.done, false, 'done');
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0, 'byteOffset');
+    assert_equals(view.byteLength, 16, 'byteLength');
+
+    return reader.read();
+  }).then(result => {
+    assert_equals(result.done, true, 'done');
+    assert_equals(result.value, undefined, 'value');
+  });
+}, 'ReadableStream with byte source: enqueue(), close(), getReader(), then read()');
+
+promise_test(() => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      controller.enqueue(new Uint8Array(16));
+      assert_equals(controller.byobRequest, undefined, 'byobRequest must be undefined');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  return reader.read().then(result => {
+    assert_equals(result.done, false, 'done');
+    assert_equals(result.value.byteLength, 16, 'byteLength');
+  });
+}, 'ReadableStream with byte source: Respond to pull() by enqueue()');
+
+promise_test(() => {
+  let pullCount = 0;
+
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_equals(controller.byobRequest, undefined, 'byobRequest is undefined');
+
+      if (pullCount === 0) {
+        assert_equals(controller.desiredSize, 256, 'desiredSize on pull');
+
+        controller.enqueue(new Uint8Array(1));
+        assert_equals(controller.desiredSize, 256, 'desiredSize after 1st enqueue()');
+
+        controller.enqueue(new Uint8Array(1));
+        assert_equals(controller.desiredSize, 256, 'desiredSize after 2nd enqueue()');
+      } else {
+        assert_unreached('Too many pull() calls');
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes'
+  }, {
+    highWaterMark: 256
+  });
+
+  const reader = stream.getReader();
+
+  const p0 = reader.read();
+  const p1 = reader.read();
+  const p2 = reader.read();
+
+  // Respond to the first pull call.
+  controller.enqueue(new Uint8Array(1));
+
+  assert_equals(pullCount, 0, 'pullCount after the enqueue() outside pull');
+
+  return Promise.all([p0, p1, p2]).then(result => {
+    assert_equals(pullCount, 1, 'pullCount after completion of all read()s');
+
+    assert_equals(result[0].done, false, 'result[0].done');
+    assert_equals(result[0].value.byteLength, 1, 'result[0].value.byteLength');
+    assert_equals(result[1].done, false, 'result[1].done');
+    assert_equals(result[1].value.byteLength, 1, 'result[1].value.byteLength');
+    assert_equals(result[2].done, false, 'result[2].done');
+    assert_equals(result[2].value.byteLength, 1, 'result[2].value.byteLength');
+  });
+}, 'ReadableStream with byte source: Respond to pull() by enqueue() asynchronously');
+
+promise_test(() => {
+  let controller;
+
+  let pullCount = 0;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      if (pullCount === 0) {
+        assert_not_equals(controller.byobRequest, undefined, 'byobRequest must not be undefined before respond()');
+
+        const view = controller.byobRequest.view;
+        view[0] = 0x01;
+        controller.byobRequest.respond(1);
+
+        assert_equals(controller.byobRequest, undefined, 'byobRequest must be undefined after respond()');
+      } else {
+        assert_unreached('Too many pull() calls');
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.read(new Uint8Array(1)).then(result => {
+    assert_equals(result.done, false, 'result.done');
+    assert_equals(result.value.byteLength, 1, 'result.value.byteLength');
+    assert_equals(result.value[0], 0x01, 'result.value[0]');
+  });
+}, 'ReadableStream with byte source: read(view), then respond()');
+
+promise_test(() => {
+  let controller;
+
+  let pullCount = 0;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      if (pullCount === 0) {
+        assert_not_equals(controller.byobRequest, undefined, 'byobRequest must not be undefined before respond()');
+
+        // Emulate ArrayBuffer transfer by just creating a new ArrayBuffer and pass it. By checking the result of
+        // read(view), we test that the respond()'s buffer argument is working correctly.
+        //
+        // A real implementation of the underlying byte source would transfer controller.byobRequest.view.buffer into
+        // a new ArrayBuffer, then construct a view around it and write to it.
+        const transferredView = new Uint8Array(1);
+        transferredView[0] = 0x01;
+        controller.byobRequest.respondWithNewView(transferredView);
+
+        assert_equals(controller.byobRequest, undefined, 'byobRequest must be undefined after respond()');
+      } else {
+        assert_unreached('Too many pull() calls');
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.read(new Uint8Array(1)).then(result => {
+    assert_equals(result.done, false, 'result.done');
+    assert_equals(result.value.byteLength, 1, 'result.value.byteLength');
+    assert_equals(result.value[0], 0x01, 'result.value[0]');
+  });
+}, 'ReadableStream with byte source: read(view), then respond() with a transferred ArrayBuffer');
+
+promise_test(t => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_not_equals(controller.byobRequest, undefined, 'byobRequest is not undefined');
+
+      assert_throws(new RangeError(), () => controller.byobRequest.respond(2), 'respond() must throw');
+      controller.byobRequest.respond(1);
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.read(new Uint8Array(1)).catch(e => {
+    assert_unreached(e);
+    t.done();
+  });
+}, 'ReadableStream with byte source: read(view), then respond() with too big value');
+
+promise_test(() => {
+  let pullCount = 0;
+
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      if (pullCount > 1) {
+        assert_unreached('Too many pull calls');
+      }
+
+      ++pullCount;
+
+      assert_not_equals(controller.byobRequest, undefined, 'byobRequest must not be undefined');
+      const view = controller.byobRequest.view;
+
+      assert_equals(view.constructor, Uint8Array);
+      assert_equals(view.buffer.byteLength, 4);
+
+      assert_equals(view.byteOffset, 0);
+      assert_equals(view.byteLength, 4);
+
+      view[0] = 0x01;
+      view[1] = 0x02;
+      view[2] = 0x03;
+
+      controller.byobRequest.respond(3);
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.read(new Uint16Array(2)).then(result => {
+    assert_equals(pullCount, 1);
+
+    assert_equals(result.done, false, 'done');
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0, 'byteOffset');
+    assert_equals(view.byteLength, 2, 'byteLength');
+
+    assert_equals(view[0], 0x0201);
+
+    return reader.read(new Uint8Array(1));
+  }).then(result => {
+    assert_equals(pullCount, 1);
+
+    assert_equals(result.done, false, 'done');
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0, 'byteOffset');
+    assert_equals(view.byteLength, 1, 'byteLength');
+
+    assert_equals(view[0], 0x03);
+  });
+}, 'ReadableStream with byte source: respond(3) to read(view) with 2 element Uint16Array enqueues the 1 byte ' +
+   'remainder');
+
+promise_test(() => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      const view = new Uint8Array(16);
+      view[15] = 0x01;
+      c.enqueue(view);
+
+      controller = c;
+    },
+    pull() {
+      assert_equals(controller.byobRequest, undefined, 'byobRequest is undefined');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.read(new Uint8Array(16)).then(result => {
+    assert_equals(result.done, false);
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0);
+    assert_equals(view.byteLength, 16);
+    assert_equals(view[15], 0x01);
+  });
+}, 'ReadableStream with byte source: enqueue(), getReader(), then read(view)');
+
+promise_test(() => {
+  let cancelCount = 0;
+
+  const passedReason = new TypeError('foo');
+
+  const stream = new ReadableStream({
+    start(c) {
+      c.enqueue(new Uint8Array(16));
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    cancel(reason) {
+      if (cancelCount === 0) {
+        assert_equals(reason, passedReason);
+      } else {
+        assert_unreached('Too many cancel calls');
+      }
+
+      ++cancelCount;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  return reader.cancel(passedReason).then(result => {
+    assert_equals(result, undefined);
+    assert_equals(cancelCount, 1);
+  });
+}, 'ReadableStream with byte source: enqueue(), getReader(), then cancel() (mode = not BYOB)');
+
+promise_test(() => {
+  let cancelCount = 0;
+
+  const passedReason = new TypeError('foo');
+
+  const stream = new ReadableStream({
+    start(c) {
+      c.enqueue(new Uint8Array(16));
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    cancel(reason) {
+      if (cancelCount === 0) {
+        assert_equals(reason, passedReason);
+      } else {
+        assert_unreached('Too many cancel calls');
+      }
+
+      ++cancelCount;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.cancel(passedReason).then(result => {
+    assert_equals(result, undefined);
+    assert_equals(cancelCount, 1);
+  });
+}, 'ReadableStream with byte source: enqueue(), getReader(), then cancel() (mode = BYOB)');
+
+promise_test(() => {
+  let cancelCount = 0;
+
+  const passedReason = new TypeError('foo');
+
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    cancel(reason) {
+      if (cancelCount === 0) {
+        assert_equals(reason, passedReason);
+
+        controller.byobRequest.respond(0);
+      } else {
+        assert_unreached('Too many cancel calls');
+      }
+
+      ++cancelCount;
+
+      return 'bar';
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  const readPromise0 = reader.read(new Uint8Array(1)).then(result => {
+    assert_equals(result.done, true);
+  });
+
+  const readPromise1 = reader.cancel(passedReason).then(result => {
+    assert_equals(result, undefined);
+    assert_equals(cancelCount, 1);
+  });
+
+  return Promise.all([readPromise0, readPromise1]);
+}, 'ReadableStream with byte source: getReader(), read(view), then cancel()');
+
+promise_test(() => {
+  let pullCount = 0;
+
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_not_equals(controller.byobRequest, undefined, 'byobRequest is undefined');
+
+      if (pullCount === 0) {
+        assert_equals(controller.byobRequest.view.byteLength, 2, 'byteLength before enqueue()');
+        controller.enqueue(new Uint8Array(1));
+        assert_equals(controller.byobRequest.view.byteLength, 1, 'byteLength after enqueue()');
+      } else {
+        assert_unreached('Too many pull calls');
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes'
+  });
+
+  return Promise.resolve().then(() => {
+    assert_equals(pullCount, 0, 'No pull() as no read(view) yet');
+
+    const reader = stream.getReader({ mode: 'byob' });
+
+    const promise = reader.read(new Uint16Array(1)).then(result => {
+      assert_equals(result.done, true, 'result.done');
+      assert_equals(result.value.constructor, Uint16Array, 'result.value');
+    });
+
+    assert_equals(pullCount, 1, '1 pull() should have been made in response to partial fill by enqueue()');
+
+    reader.cancel();
+
+    // Tell that the buffer given via pull() is returned.
+    controller.byobRequest.respond(0);
+
+    return promise;
+  });
+}, 'ReadableStream with byte source: cancel() with partially filled pending pull() request');
+
+promise_test(() => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      const view = new Uint8Array(8);
+      view[7] = 0x01;
+      c.enqueue(view);
+
+      controller = c;
+    },
+    pull() {
+      assert_equals(controller.byobRequest, undefined, 'byobRequest must be undefined');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  const buffer = new ArrayBuffer(16);
+
+  return reader.read(new Uint8Array(buffer, 8, 8)).then(result => {
+    assert_equals(result.done, false);
+
+    const view = result.value;
+    assert_equals(view.constructor, Uint8Array);
+    assert_equals(view.buffer.byteLength, 16);
+    assert_equals(view.byteOffset, 8);
+    assert_equals(view.byteLength, 8);
+    assert_equals(view[7], 0x01);
+  });
+}, 'ReadableStream with byte source: enqueue(), getReader(), then read(view) where view.buffer is not fully ' +
+   'covered by view');
+
+promise_test(() => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      let view;
+
+      view = new Uint8Array(16);
+      view[15] = 123;
+      c.enqueue(view);
+
+      view = new Uint8Array(8);
+      view[7] = 111;
+      c.enqueue(view);
+
+      controller = c;
+    },
+    pull() {
+      assert_equals(controller.byobRequest, undefined, 'byobRequest must be undefined');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.read(new Uint8Array(24)).then(result => {
+    assert_equals(result.done, false, 'done');
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0, 'byteOffset');
+    assert_equals(view.byteLength, 24, 'byteLength');
+    assert_equals(view[15], 123, 'Contents are set from the first chunk');
+    assert_equals(view[23], 111, 'Contents are set from the second chunk');
+  });
+}, 'ReadableStream with byte source: Multiple enqueue(), getReader(), then read(view)');
+
+promise_test(() => {
+  const stream = new ReadableStream({
+    start(c) {
+      const view = new Uint8Array(16);
+      view[15] = 0x01;
+      c.enqueue(view);
+    },
+    pull(controller) {
+      assert_equals(controller.byobRequest, undefined, 'byobRequest must be undefined');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.read(new Uint8Array(24)).then(result => {
+    assert_equals(result.done, false);
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0);
+    assert_equals(view.byteLength, 16);
+    assert_equals(view[15], 0x01);
+  });
+}, 'ReadableStream with byte source: enqueue(), getReader(), then read(view) with a bigger view');
+
+promise_test(() => {
+  const stream = new ReadableStream({
+    start(c) {
+      const view = new Uint8Array(16);
+      view[7] = 0x01;
+      view[15] = 0x02;
+      c.enqueue(view);
+    },
+    pull(controller) {
+      assert_equals(controller.byobRequest, undefined, 'byobRequest must be undefined');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.read(new Uint8Array(8)).then(result => {
+    assert_equals(result.done, false, 'done');
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0);
+    assert_equals(view.byteLength, 8);
+    assert_equals(view[7], 0x01);
+
+    return reader.read(new Uint8Array(8));
+  }).then(result => {
+    assert_equals(result.done, false, 'done');
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0);
+    assert_equals(view.byteLength, 8);
+    assert_equals(view[7], 0x02);
+  });
+}, 'ReadableStream with byte source: enqueue(), getReader(), then read(view) with a smaller views');
+
+promise_test(() => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      const view = new Uint8Array(1);
+      view[0] = 0xff;
+      c.enqueue(view);
+
+      controller = c;
+    },
+    pull() {
+      if (controller.byobRequest === undefined) {
+        return;
+      }
+
+      const view = controller.byobRequest.view;
+
+      assert_equals(view.constructor, Uint8Array);
+      assert_equals(view.buffer.byteLength, 2);
+
+      assert_equals(view.byteOffset, 1);
+      assert_equals(view.byteLength, 1);
+
+      view[0] = 0xaa;
+      controller.byobRequest.respond(1);
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.read(new Uint16Array(1)).then(result => {
+    assert_equals(result.done, false);
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0);
+    assert_equals(view.byteLength, 2);
+    assert_equals(view[0], 0xaaff);
+  });
+}, 'ReadableStream with byte source: enqueue() 1 byte, getReader(), then read(view) with Uint16Array');
+
+promise_test(() => {
+  let pullCount = 0;
+
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      const view = new Uint8Array(3);
+      view[0] = 0x01;
+      view[2] = 0x02;
+      c.enqueue(view);
+
+      controller = c;
+    },
+    pull() {
+      assert_not_equals(controller.byobRequest, undefined, 'byobRequest must not be undefined');
+
+      if (pullCount === 0) {
+        const view = controller.byobRequest.view;
+
+        assert_equals(view.constructor, Uint8Array);
+        assert_equals(view.buffer.byteLength, 2);
+        assert_equals(view.byteOffset, 1);
+        assert_equals(view.byteLength, 1);
+
+        view[0] = 0x03;
+        controller.byobRequest.respond(1);
+
+        assert_equals(controller.desiredSize, 0, 'desiredSize');
+      } else {
+        assert_unreached('Too many pull calls');
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes'
+  });
+
+  // Wait for completion of the start method to be reflected.
+  return Promise.resolve().then(() => {
+    const reader = stream.getReader({ mode: 'byob' });
+
+    const promise = reader.read(new Uint16Array(2)).then(result => {
+      assert_equals(result.done, false, 'done');
+
+      const view = result.value;
+      assert_equals(view.constructor, Uint16Array, 'constructor');
+      assert_equals(view.buffer.byteLength, 4, 'buffer.byteLength');
+      assert_equals(view.byteOffset, 0, 'byteOffset');
+      assert_equals(view.byteLength, 2, 'byteLength');
+      assert_equals(view[0], 0x0001, 'Contents are set');
+
+      const p = reader.read(new Uint16Array(1));
+
+      assert_equals(pullCount, 1);
+
+      return p;
+    }).then(result => {
+      assert_equals(result.done, false, 'done');
+
+      const view = result.value;
+      assert_equals(view.buffer.byteLength, 2, 'buffer.byteLength');
+      assert_equals(view.byteOffset, 0, 'byteOffset');
+      assert_equals(view.byteLength, 2, 'byteLength');
+      assert_equals(view[0], 0x0302, 'Contents are set');
+    });
+
+    assert_equals(pullCount, 0);
+
+    return promise;
+  });
+}, 'ReadableStream with byte source: enqueue() 3 byte, getReader(), then read(view) with 2-element Uint16Array');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    start(c) {
+      const view = new Uint8Array(1);
+      view[0] = 0xff;
+      c.enqueue(view);
+      c.close();
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+
+  const promise = promise_rejects(t, new TypeError(), reader.read(new Uint16Array(1)), 'read(view) must fail');
+  return promise_rejects(t, new TypeError(), promise.then(() => reader.closed));
+}, 'ReadableStream with byte source: read(view) with Uint16Array on close()-d stream with 1 byte enqueue()-d must ' +
+   'fail');
+
+promise_test(t => {
+  let pullCount = 0;
+
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      const view = new Uint8Array(1);
+      view[0] = 0xff;
+      c.enqueue(view);
+
+      controller = c;
+    },
+    pull() {
+      assert_not_equals(controller.byobRequest, undefined, 'byobRequest must not be undefined');
+
+      if (pullCount === 0) {
+        const view = controller.byobRequest.view;
+
+        assert_equals(view.constructor, Uint8Array);
+        assert_equals(view.buffer.byteLength, 2);
+
+        assert_equals(view.byteOffset, 1);
+        assert_equals(view.byteLength, 1);
+      } else {
+        assert_unreached('Too many pull calls');
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  let promise = promise_rejects(t, new TypeError(), reader.read(new Uint16Array(1)), 'read(view) must fail');
+  promise = promise_rejects(t, new TypeError(), promise.then(() => reader.closed));
+  promise = promise.then(() => {
+    assert_equals(pullCount, 0);
+  });
+
+  assert_throws(new TypeError(), () => controller.close(), 'controller.close() must throw');
+
+  return promise;
+}, 'ReadableStream with byte source: A stream must be errored if close()-d before fulfilling read(view) with ' +
+   'Uint16Array');
+
+test(() => {
+  let controller;
+
+  new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    type: 'bytes'
+  });
+
+  // Enqueue a chunk so that the stream doesn't get closed. This is to check duplicate close() calls are rejected
+  // even if the stream has not yet entered the closed state.
+  const view = new Uint8Array(1);
+  controller.enqueue(view);
+  controller.close();
+
+  assert_throws(new TypeError(), () => controller.close(), 'controller.close() must throw');
+}, 'ReadableStream with byte source: Throw if close()-ed more than once');
+
+test(() => {
+  let controller;
+
+  new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    type: 'bytes'
+  });
+
+  // Enqueue a chunk so that the stream doesn't get closed. This is to check enqueue() after close() is  rejected
+  // even if the stream has not yet entered the closed state.
+  const view = new Uint8Array(1);
+  controller.enqueue(view);
+  controller.close();
+
+  assert_throws(new TypeError(), () => controller.enqueue(view), 'controller.close() must throw');
+}, 'ReadableStream with byte source: Throw on enqueue() after close()');
+
+promise_test(() => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_not_equals(controller.byobRequest, undefined, 'byobRequest must not be undefined');
+      const view = controller.byobRequest.view;
+
+      assert_equals(view.constructor, Uint8Array);
+      assert_equals(view.buffer.byteLength, 16);
+
+      assert_equals(view.byteOffset, 0);
+      assert_equals(view.byteLength, 16);
+
+      view[15] = 0x01;
+      controller.byobRequest.respond(16);
+      controller.close();
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.read(new Uint8Array(16)).then(result => {
+    assert_equals(result.done, false);
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0);
+    assert_equals(view.byteLength, 16);
+    assert_equals(view[15], 0x01);
+
+    return reader.read(new Uint8Array(16));
+  }).then(result => {
+    assert_equals(result.done, true);
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0);
+    assert_equals(view.byteLength, 0);
+  });
+}, 'ReadableStream with byte source: read(view), then respond() and close() in pull()');
+
+promise_test(() => {
+  let pullCount = 0;
+
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      if (controller.byobRequest === undefined) {
+        return;
+      }
+
+      if (pullCount < 1) {
+        for (let i = 0; i < 4; ++i) {
+          const view = controller.byobRequest.view;
+
+          assert_equals(view.constructor, Uint8Array);
+          assert_equals(view.buffer.byteLength, 4);
+
+          assert_equals(view.byteOffset, i);
+          assert_equals(view.byteLength, 4 - i);
+
+          view[0] = 0x01;
+          controller.byobRequest.respond(1);
+        }
+      } else {
+        assert_unreached('Too many pull() calls');
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return reader.read(new Uint32Array(1)).then(result => {
+    assert_equals(result.done, false);
+
+    const view = result.value;
+    assert_equals(view.byteOffset, 0);
+    assert_equals(view.byteLength, 4);
+    assert_equals(view[0], 0x01010101);
+  });
+}, 'ReadableStream with byte source: read(view) with Uint32Array, then fill it by multiple respond() calls');
+
+promise_test(() => {
+  let pullCount = 0;
+
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_equals(controller.byobRequest, undefined, 'byobRequest must be undefined');
+
+      if (pullCount > 1) {
+        assert_unreached('Too many pull calls');
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  const p0 = reader.read().then(result => {
+    assert_equals(pullCount, 1);
+
+    controller.enqueue(new Uint8Array(2));
+
+    // Since the queue has data no less than HWM, no more pull.
+    assert_equals(pullCount, 1);
+
+    assert_equals(result.done, false);
+
+    const view = result.value;
+    assert_equals(view.constructor, Uint8Array);
+    assert_equals(view.buffer.byteLength, 1);
+    assert_equals(view.byteOffset, 0);
+    assert_equals(view.byteLength, 1);
+  });
+
+  assert_equals(pullCount, 0, 'No pull should have been made since the startPromise has not yet been handled');
+
+  const p1 = reader.read().then(result => {
+    assert_equals(pullCount, 1);
+
+    assert_equals(result.done, false);
+
+    const view = result.value;
+    assert_equals(view.constructor, Uint8Array);
+    assert_equals(view.buffer.byteLength, 2);
+    assert_equals(view.byteOffset, 0);
+    assert_equals(view.byteLength, 2);
+  });
+
+  assert_equals(pullCount, 0, 'No pull should have been made since the startPromise has not yet been handled');
+
+  controller.enqueue(new Uint8Array(1));
+
+  assert_equals(pullCount, 0, 'No pull should have been made since the startPromise has not yet been handled');
+
+  return Promise.all([p0, p1]);
+}, 'ReadableStream with byte source: read() twice, then enqueue() twice');
+
+promise_test(() => {
+  let pullCount = 0;
+
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_not_equals(controller.byobRequest, undefined, 'byobRequest must not be undefined');
+
+      if (pullCount === 0) {
+        const view = controller.byobRequest.view;
+
+        assert_equals(view.constructor, Uint8Array);
+        assert_equals(view.buffer.byteLength, 16);
+
+        assert_equals(view.byteOffset, 0);
+        assert_equals(view.byteLength, 16);
+      } else {
+        assert_unreached('Too many pull calls');
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  const p0 = reader.read(new Uint8Array(16)).then(result => {
+    assert_equals(result.done, true, '1st read: done');
+
+    const view = result.value;
+    assert_equals(view.buffer.byteLength, 16, '1st read: buffer.byteLength');
+    assert_equals(view.byteOffset, 0, '1st read: byteOffset');
+    assert_equals(view.byteLength, 0, '1st read: byteLength');
+  });
+
+  const p1 = reader.read(new Uint8Array(32)).then(result => {
+    assert_equals(result.done, true, '2nd read: done');
+
+    const view = result.value;
+    assert_equals(view.buffer.byteLength, 32, '2nd read: buffer.byteLength');
+    assert_equals(view.byteOffset, 0, '2nd read: byteOffset');
+    assert_equals(view.byteLength, 0, '2nd read: byteLength');
+  });
+
+  controller.close();
+  controller.byobRequest.respond(0);
+
+  return Promise.all([p0, p1]);
+}, 'ReadableStream with byte source: Multiple read(view), close() and respond()');
+
+promise_test(() => {
+  let pullCount = 0;
+
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      if (pullCount === 0) {
+        assert_not_equals(controller.byobRequest, undefined, 'byobRequest must not be undefined');
+        const view = controller.byobRequest.view;
+
+        assert_equals(view.constructor, Uint8Array);
+        assert_equals(view.buffer.byteLength, 16);
+
+        assert_equals(view.byteOffset, 0);
+        assert_equals(view.byteLength, 16);
+      } else {
+        assert_unreached();
+      }
+
+      ++pullCount;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  const p0 = reader.read(new Uint8Array(16)).then(result => {
+    assert_equals(result.done, false, '1st read: done');
+
+    const view = result.value;
+    assert_equals(view.buffer.byteLength, 16, '1st read: buffer.byteLength');
+    assert_equals(view.byteOffset, 0, '1st read: byteOffset');
+    assert_equals(view.byteLength, 16, '1st read: byteLength');
+  });
+
+  const p1 = reader.read(new Uint8Array(16)).then(result => {
+    assert_equals(result.done, false, '2nd read: done');
+
+    const view = result.value;
+    assert_equals(view.buffer.byteLength, 16, '2nd read: buffer.byteLength');
+    assert_equals(view.byteOffset, 0, '2nd read: byteOffset');
+    assert_equals(view.byteLength, 8, '2nd read: byteLength');
+  });
+
+  controller.enqueue(new Uint8Array(24));
+
+  return Promise.all([p0, p1]);
+}, 'ReadableStream with byte source: Multiple read(view), big enqueue()');
+
+promise_test(() => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  let bytesRead = 0;
+
+  function pump() {
+    return reader.read(new Uint8Array(7)).then(result => {
+      if (result.done) {
+        assert_equals(bytesRead, 1024);
+
+        return null;
+      }
+
+      bytesRead += result.value.byteLength;
+
+      return pump();
+    }).catch(e => {
+      assert_unreached(e);
+    });
+  }
+  const promise = pump();
+
+  controller.enqueue(new Uint8Array(512));
+  controller.enqueue(new Uint8Array(512));
+  controller.close();
+
+  return promise;
+}, 'ReadableStream with byte source: Multiple read(view) and multiple enqueue()');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    pull(controller) {
+      assert_equals(controller.byobRequest, undefined, 'byobRequest must be undefined');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return promise_rejects(t, new TypeError(), reader.read(), 'read() must fail');
+}, 'ReadableStream with byte source: read(view) with passing undefined as view must fail');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    pull(controller) {
+      assert_equals(controller.byobRequest, undefined, 'byobRequest must be undefined');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return promise_rejects(t, new TypeError(), reader.read(new Uint8Array(0)), 'read(view) must fail');
+}, 'ReadableStream with byte source: read(view) with zero-length view must fail');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return promise_rejects(t, new TypeError(), reader.read({}), 'read(view) must fail');
+}, 'ReadableStream with byte source: read(view) with passing an empty object as view must fail');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return promise_rejects(t, new TypeError(),
+                         reader.read({ buffer: new ArrayBuffer(10), byteOffset: 0, byteLength: 10 }),
+                         'read(view) must fail');
+}, 'ReadableStream with byte source: Even read(view) with passing ArrayBufferView like object as view must fail');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    start(c) {
+      c.error(error1);
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  return promise_rejects(t, error1, reader.read(), 'read() must fail');
+}, 'ReadableStream with byte source: read() on an errored stream');
+
+promise_test(t => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  const promise = promise_rejects(t, error1, reader.read(), 'read() must fail');
+
+  controller.error(error1);
+
+  return promise;
+}, 'ReadableStream with byte source: read(), then error()');
+
+promise_test(t => {
+  const stream = new ReadableStream({
+    start(c) {
+      c.error(error1);
+    },
+    pull() {
+      assert_unreached('pull must not be called');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return promise_rejects(t, error1, reader.read(new Uint8Array(1)), 'read() must fail');
+}, 'ReadableStream with byte source: read(view) on an errored stream');
+
+promise_test(t => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  const promise = promise_rejects(t, error1, reader.read(new Uint8Array(1)), 'read() must fail');
+
+  controller.error(error1);
+
+  return promise;
+}, 'ReadableStream with byte source: read(view), then error()');
+
+promise_test(t => {
+  let controller;
+
+  const testError = new TypeError('foo');
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_equals(controller.byobRequest, undefined, 'byobRequest must be undefined');
+      throw testError;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  const promise = promise_rejects(t, testError, reader.read(), 'read() must fail');
+  return promise_rejects(t, testError, promise.then(() => reader.closed));
+}, 'ReadableStream with byte source: Throwing in pull function must error the stream');
+
+promise_test(t => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_equals(controller.byobRequest, undefined, 'byobRequest must be undefined');
+      controller.error(error1);
+      throw new TypeError('foo');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader();
+
+  return promise_rejects(t, error1, reader.read(), 'read() must fail').then(() => {
+    return promise_rejects(t, error1, reader.closed, 'closed must fail');
+  });
+}, 'ReadableStream with byte source: Throwing in pull in response to read() must be ignored if the stream is ' +
+   'errored in it');
+
+promise_test(t => {
+  let controller;
+
+  const testError = new TypeError('foo');
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_not_equals(controller.byobRequest, undefined, 'byobRequest must not be undefined');
+      throw testError;
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  const promise = promise_rejects(t, testError, reader.read(new Uint8Array(1)), 'read(view) must fail');
+  return promise_rejects(t, testError, promise.then(() => reader.closed));
+}, 'ReadableStream with byte source: Throwing in pull in response to read(view) function must error the stream');
+
+promise_test(t => {
+  let controller;
+
+  const stream = new ReadableStream({
+    start(c) {
+      controller = c;
+    },
+    pull() {
+      assert_not_equals(controller.byobRequest, undefined, 'byobRequest must not be undefined');
+      controller.error(error1);
+      throw new TypeError('foo');
+    },
+    type: 'bytes'
+  });
+
+  const reader = stream.getReader({ mode: 'byob' });
+
+  return promise_rejects(t, error1, reader.read(new Uint8Array(1)), 'read(view) must fail').then(() => {
+    return promise_rejects(t, error1, reader.closed, 'closed must fail');
+  });
+}, 'ReadableStream with byte source: Throwing in pull in response to read(view) must be ignored if the stream is ' +
+   'errored in it');
+
+
+test(() => {
+  const ReadableStreamBYOBReader = new ReadableStream({ type: 'bytes' }).getReader({ mode: 'byob' }).constructor;
+  const stream = new ReadableStream({ type: 'bytes' });
+  new ReadableStreamBYOBReader(stream);
+}, 'ReadableStreamBYOBReader can be constructed directly');
+
+test(() => {
+  const ReadableStreamBYOBReader = new ReadableStream({ type: 'bytes' }).getReader({ mode: 'byob' }).constructor;
+  assert_throws(new TypeError(), () => new ReadableStreamBYOBReader({}), 'constructor must throw');
+}, 'ReadableStreamBYOBReader constructor requires a ReadableStream argument');
+
+test(() => {
+  const ReadableStreamBYOBReader = new ReadableStream({ type: 'bytes' }).getReader({ mode: 'byob' }).constructor;
+  const stream = new ReadableStream({ type: 'bytes' });
+  stream.getReader();
+  assert_throws(new TypeError(), () => new ReadableStreamBYOBReader(stream), 'constructor must throw');
+}, 'ReadableStreamBYOBReader constructor requires an unlocked ReadableStream');
+
+test(() => {
+  const ReadableStreamBYOBReader = new ReadableStream({ type: 'bytes' }).getReader({ mode: 'byob' }).constructor;
+  const stream = new ReadableStream();
+  assert_throws(new TypeError(), () => new ReadableStreamBYOBReader(stream), 'constructor must throw');
+}, 'ReadableStreamBYOBReader constructor requires a ReadableStream with type "bytes"');
+
+done();