text: 'use strict';
  
  // These tests can be run against any readable stream produced by the web platform that meets the given descriptions.
  // For readable stream tests, the factory should return the stream. For reader tests, the factory should return a
  // { stream, reader } object. (You can use this to vary the time at which you acquire a reader.)
  
  self.templatedRSEmpty = (label, factory) => {
    test(() => {}, 'Running templatedRSEmpty with ' + label);
  
    test(() => {
  
      const rs = factory();
  
      assert_equals(typeof rs.locked, 'boolean', 'has a boolean locked getter');
      assert_equals(typeof rs.cancel, 'function', 'has a cancel method');
      assert_equals(typeof rs.getReader, 'function', 'has a getReader method');
      assert_equals(typeof rs.pipeThrough, 'function', 'has a pipeThrough method');
      assert_equals(typeof rs.pipeTo, 'function', 'has a pipeTo method');
      assert_equals(typeof rs.tee, 'function', 'has a tee method');
  
    }, 'instances have the correct methods and properties');
  
    test(() => {
      const rs = factory();
  
      assert_throws(new RangeError(), () => rs.getReader({ mode: '' }), 'empty string mode should throw');
      assert_throws(new RangeError(), () => rs.getReader({ mode: null }), 'null mode should throw');
      assert_throws(new RangeError(), () => rs.getReader({ mode: 'asdf' }), 'asdf mode should throw');
      assert_throws(new TypeError(), () => rs.getReader(null), 'null should throw');
  
    }, 'calling getReader with invalid arguments should throw appropriate errors');
  };
  
  self.templatedRSClosed = (label, factory) => {
    test(() => {}, 'Running templatedRSClosed with ' + label);
  
    promise_test(() => {
  
      const rs = factory();
      const cancelPromise1 = rs.cancel();
      const cancelPromise2 = rs.cancel();
  
      assert_not_equals(cancelPromise1, cancelPromise2, 'cancel() calls should return distinct promises');
  
      return Promise.all([
        cancelPromise1.then(v => assert_equals(v, undefined, 'first cancel() call should fulfill with undefined')),
        cancelPromise2.then(v => assert_equals(v, undefined, 'second cancel() call should fulfill with undefined'))
      ]);
  
    }, 'cancel() should return a distinct fulfilled promise each time');
  
    test(() => {
  
      const rs = factory();
      assert_false(rs.locked, 'locked getter should return false');
  
    }, 'locked should be false');
  
    test(() => {
  
      const rs = factory();
      rs.getReader(); // getReader() should not throw.
  
    }, 'getReader() should be OK');
  
    test(() => {
  
      const rs = factory();
  
      const reader = rs.getReader();
      reader.releaseLock();
  
      const reader2 = rs.getReader(); // Getting a second reader should not throw.
      reader2.releaseLock();
  
      rs.getReader(); // Getting a third reader should not throw.
  
    }, 'should be able to acquire multiple readers if they are released in succession');
  
    test(() => {
  
      const rs = factory();
  
      rs.getReader();
  
      assert_throws(new TypeError(), () => rs.getReader(), 'getting a second reader should throw');
      assert_throws(new TypeError(), () => rs.getReader(), 'getting a third reader should throw');
  
    }, 'should not be able to acquire a second reader if we don\'t release the first one');
  };
  
  self.templatedRSErrored = (label, factory, error) => {
    test(() => {}, 'Running templatedRSErrored with ' + label);
  
    promise_test(t => {
  
      const rs = factory();
      const reader = rs.getReader();
  
      return Promise.all([
        promise_rejects(t, error, reader.closed),
        promise_rejects(t, error, reader.read())
      ]);
  
    }, 'getReader() should return a reader that acts errored');
  
    promise_test(t => {
  
      const rs = factory();
      const reader = rs.getReader();
  
      return Promise.all([
        promise_rejects(t, error, reader.read()),
        promise_rejects(t, error, reader.read()),
        promise_rejects(t, error, reader.closed)
      ]);
  
    }, 'read() twice should give the error each time');
  
    test(() => {
      const rs = factory();
  
      assert_false(rs.locked, 'locked getter should return false');
    }, 'locked should be false');
  };
  
  self.templatedRSErroredSyncOnly = (label, factory, error) => {
    test(() => {}, 'Running templatedRSErroredSyncOnly with ' + label);
  
    promise_test(t => {
  
      const rs = factory();
      rs.getReader().releaseLock();
      const reader = rs.getReader(); // Calling getReader() twice does not throw (the stream is not locked).
  
      return promise_rejects(t, error, reader.closed);
  
    }, 'should be able to obtain a second reader, with the correct closed promise');
  
    test(() => {
  
      const rs = factory();
      rs.getReader();
  
      assert_throws(new TypeError(), () => rs.getReader(), 'getting a second reader should throw a TypeError');
      assert_throws(new TypeError(), () => rs.getReader(), 'getting a third reader should throw a TypeError');
  
    }, 'should not be able to obtain additional readers if we don\'t release the first lock');
  
    promise_test(t => {
  
      const rs = factory();
      const cancelPromise1 = rs.cancel();
      const cancelPromise2 = rs.cancel();
  
      assert_not_equals(cancelPromise1, cancelPromise2, 'cancel() calls should return distinct promises');
  
      return Promise.all([
        promise_rejects(t, error, cancelPromise1),
        promise_rejects(t, error, cancelPromise2)
      ]);
  
    }, 'cancel() should return a distinct rejected promise each time');
  
    promise_test(t => {
  
      const rs = factory();
      const reader = rs.getReader();
      const cancelPromise1 = reader.cancel();
      const cancelPromise2 = reader.cancel();
  
      assert_not_equals(cancelPromise1, cancelPromise2, 'cancel() calls should return distinct promises');
  
      return Promise.all([
        promise_rejects(t, error, cancelPromise1),
        promise_rejects(t, error, cancelPromise2)
      ]);
  
    }, 'reader cancel() should return a distinct rejected promise each time');
  };
  
  self.templatedRSEmptyReader = (label, factory) => {
    test(() => {}, 'Running templatedRSEmptyReader with ' + label);
  
    test(() => {
  
      const reader = factory().reader;
  
      assert_true('closed' in reader, 'has a closed property');
      assert_equals(typeof reader.closed.then, 'function', 'closed property is thenable');
  
      assert_equals(typeof reader.cancel, 'function', 'has a cancel method');
      assert_equals(typeof reader.read, 'function', 'has a read method');
      assert_equals(typeof reader.releaseLock, 'function', 'has a releaseLock method');
  
    }, 'instances have the correct methods and properties');
  
    test(() => {
  
      const stream = factory().stream;
  
      assert_true(stream.locked, 'locked getter should return true');
  
    }, 'locked should be true');
  
    promise_test(t => {
  
      const reader = factory().reader;
  
      reader.read().then(
        t.unreached_func('read() should not fulfill'),
        t.unreached_func('read() should not reject')
      );
  
      return delay(500);
  
    }, 'read() should never settle');
  
    promise_test(t => {
  
      const reader = factory().reader;
  
      reader.read().then(
        t.unreached_func('read() should not fulfill'),
        t.unreached_func('read() should not reject')
      );
  
      reader.read().then(
        t.unreached_func('read() should not fulfill'),
        t.unreached_func('read() should not reject')
      );
  
      return delay(500);
  
    }, 'two read()s should both never settle');
  
    test(() => {
  
      const reader = factory().reader;
      assert_not_equals(reader.read(), reader.read(), 'the promises returned should be distinct');
  
    }, 'read() should return distinct promises each time');
  
    test(() => {
  
      const stream = factory().stream;
      assert_throws(new TypeError(), () => stream.getReader(), 'stream.getReader() should throw a TypeError');
  
    }, 'getReader() again on the stream should fail');
  
    promise_test(t => {
  
      const streamAndReader = factory();
      const stream = streamAndReader.stream;
      const reader = streamAndReader.reader;
  
      reader.read().then(
        t.unreached_func('first read() should not fulfill'),
        t.unreached_func('first read() should not reject')
      );
  
      reader.read().then(
        t.unreached_func('second read() should not fulfill'),
        t.unreached_func('second read() should not reject')
      );
  
      reader.closed.then(
        t.unreached_func('closed should not fulfill'),
        t.unreached_func('closed should not reject')
      );
  
      assert_throws(new TypeError(), () => reader.releaseLock(), 'releaseLock should throw a TypeError');
  
      assert_true(stream.locked, 'the stream should still be locked');
  
      return delay(500);
  
    }, 'releasing the lock with pending read requests should throw but the read requests should stay pending');
  
    promise_test(t => {
  
      const reader = factory().reader;
      reader.releaseLock();
  
      return Promise.all([
        promise_rejects(t, new TypeError(), reader.read()),
        promise_rejects(t, new TypeError(), reader.read())
      ]);
  
    }, 'releasing the lock should cause further read() calls to reject with a TypeError');
  
    promise_test(t => {
  
      const reader = factory().reader;
  
      const closedBefore = reader.closed;
      reader.releaseLock();
      const closedAfter = reader.closed;
  
      assert_equals(closedBefore, closedAfter, 'the closed promise should not change identity');
  
      return promise_rejects(t, new TypeError(), closedBefore);
  
    }, 'releasing the lock should cause closed calls to reject with a TypeError');
  
    test(() => {
  
      const streamAndReader = factory();
      const stream = streamAndReader.stream;
      const reader = streamAndReader.reader;
  
      reader.releaseLock();
      assert_false(stream.locked, 'locked getter should return false');
  
    }, 'releasing the lock should cause locked to become false');
  
    promise_test(() => {
  
      const reader = factory().reader;
      reader.cancel();
  
      return reader.read().then(r => {
        assert_object_equals(r, { value: undefined, done: true }, 'read()ing from the reader should give a done result');
      });
  
    }, 'canceling via the reader should cause the reader to act closed');
  
    promise_test(t => {
  
      const stream = factory().stream;
      return promise_rejects(t, new TypeError(), stream.cancel());
  
    }, 'canceling via the stream should fail');
  };
  
  self.templatedRSClosedReader = (label, factory) => {
    test(() => {}, 'Running templatedRSClosedReader with ' + label);
  
    promise_test(() => {
  
      const reader = factory().reader;
  
      return reader.read().then(v => {
        assert_object_equals(v, { value: undefined, done: true }, 'read() should fulfill correctly');
      });
  
    }, 'read() should fulfill with { value: undefined, done: true }');
  
    promise_test(() => {
  
      const reader = factory().reader;
  
      return Promise.all([
        reader.read().then(v => {
          assert_object_equals(v, { value: undefined, done: true }, 'read() should fulfill correctly');
        }),
        reader.read().then(v => {
          assert_object_equals(v, { value: undefined, done: true }, 'read() should fulfill correctly');
        })
      ]);
  
    }, 'read() multiple times should fulfill with { value: undefined, done: true }');
  
    promise_test(() => {
  
      const reader = factory().reader;
  
      return reader.read().then(() => reader.read()).then(v => {
        assert_object_equals(v, { value: undefined, done: true }, 'read() should fulfill correctly');
      });
  
    }, 'read() should work when used within another read() fulfill callback');
  
    promise_test(() => {
  
      const reader = factory().reader;
  
      return reader.closed.then(v => assert_equals(v, undefined, 'reader closed should fulfill with undefined'));
  
    }, 'closed should fulfill with undefined');
  
    promise_test(t => {
  
      const reader = factory().reader;
  
      const closedBefore = reader.closed;
      reader.releaseLock();
      const closedAfter = reader.closed;
  
      assert_not_equals(closedBefore, closedAfter, 'the closed promise should change identity');
  
      return Promise.all([
        closedBefore.then(v => assert_equals(v, undefined, 'reader.closed acquired before release should fulfill')),
        promise_rejects(t, new TypeError(), closedAfter)
      ]);
  
    }, 'releasing the lock should cause closed to reject and change identity');
  
    promise_test(() => {
  
      const reader = factory().reader;
      const cancelPromise1 = reader.cancel();
      const cancelPromise2 = reader.cancel();
      const closedReaderPromise = reader.closed;
  
      assert_not_equals(cancelPromise1, cancelPromise2, 'cancel() calls should return distinct promises');
      assert_not_equals(cancelPromise1, closedReaderPromise, 'cancel() promise 1 should be distinct from reader.closed');
      assert_not_equals(cancelPromise2, closedReaderPromise, 'cancel() promise 2 should be distinct from reader.closed');
  
      return Promise.all([
        cancelPromise1.then(v => assert_equals(v, undefined, 'first cancel() should fulfill with undefined')),
        cancelPromise2.then(v => assert_equals(v, undefined, 'second cancel() should fulfill with undefined'))
      ]);
  
    }, 'cancel() should return a distinct fulfilled promise each time');
  };
  
  self.templatedRSErroredReader = (label, factory, error) => {
    test(() => {}, 'Running templatedRSErroredReader with ' + label);
  
    promise_test(t => {
  
      const reader = factory().reader;
      return promise_rejects(t, error, reader.closed);
  
    }, 'closed should reject with the error');
  
    promise_test(t => {
  
      const reader = factory().reader;
      const closedBefore = reader.closed;
  
      return promise_rejects(t, error, closedBefore).then(() => {
        reader.releaseLock();
  
        const closedAfter = reader.closed;
        assert_not_equals(closedBefore, closedAfter, 'the closed promise should change identity');
  
        return promise_rejects(t, new TypeError(), closedAfter);
      });
  
    }, 'releasing the lock should cause closed to reject and change identity');
  
    promise_test(t => {
  
      const reader = factory().reader;
      return promise_rejects(t, error, reader.read());
  
    }, 'read() should reject with the error');
  };
  
  self.templatedRSTwoChunksOpenReader = (label, factory, chunks) => {
    test(() => {}, 'Running templatedRSTwoChunksOpenReader with ' + label);
  
    promise_test(() => {
  
      const reader = factory().reader;
  
      return Promise.all([
        reader.read().then(r => {
          assert_object_equals(r, { value: chunks[0], done: false }, 'first result should be correct');
        }),
        reader.read().then(r => {
          assert_object_equals(r, { value: chunks[1], done: false }, 'second result should be correct');
        })
      ]);
  
    }, 'calling read() twice without waiting will eventually give both chunks (sequential)');
  
    promise_test(() => {
  
      const reader = factory().reader;
  
      return reader.read().then(r => {
        assert_object_equals(r, { value: chunks[0], done: false }, 'first result should be correct');
  
        return reader.read().then(r2 => {
          assert_object_equals(r2, { value: chunks[1], done: false }, 'second result should be correct');
        });
      });
  
    }, 'calling read() twice without waiting will eventually give both chunks (nested)');
  
    test(() => {
  
      const reader = factory().reader;
      assert_not_equals(reader.read(), reader.read(), 'the promises returned should be distinct');
  
    }, 'read() should return distinct promises each time');
  
    promise_test(() => {
  
      const reader = factory().reader;
  
      const promise1 = reader.closed.then(v => {
        assert_equals(v, undefined, 'reader closed should fulfill with undefined');
      });
  
      const promise2 = reader.read().then(r => {
        assert_object_equals(r, { value: chunks[0], done: false },
                             'promise returned before cancellation should fulfill with a chunk');
      });
  
      reader.cancel();
  
      const promise3 = reader.read().then(r => {
        assert_object_equals(r, { value: undefined, done: true },
                             'promise returned after cancellation should fulfill with an end-of-stream signal');
      });
  
      return Promise.all([promise1, promise2, promise3]);
  
    }, 'cancel() after a read() should still give that single read result');
  };
  
  self.templatedRSTwoChunksClosedReader = function (label, factory, chunks) {
    test(() => {}, 'Running templatedRSTwoChunksClosedReader with ' + label);
  
    promise_test(() => {
  
      const reader = factory().reader;
  
      return Promise.all([
        reader.read().then(r => {
          assert_object_equals(r, { value: chunks[0], done: false }, 'first result should be correct');
        }),
        reader.read().then(r => {
          assert_object_equals(r, { value: chunks[1], done: false }, 'second result should be correct');
        }),
        reader.read().then(r => {
          assert_object_equals(r, { value: undefined, done: true }, 'third result should be correct');
        })
      ]);
  
    }, 'third read(), without waiting, should give { value: undefined, done: true } (sequential)');
  
    promise_test(() => {
  
      const reader = factory().reader;
  
      return reader.read().then(r => {
        assert_object_equals(r, { value: chunks[0], done: false }, 'first result should be correct');
  
        return reader.read().then(r2 => {
          assert_object_equals(r2, { value: chunks[1], done: false }, 'second result should be correct');
  
          return reader.read().then(r3 => {
            assert_object_equals(r3, { value: undefined, done: true }, 'third result should be correct');
          });
        });
      });
  
    }, 'third read(), without waiting, should give { value: undefined, done: true } (nested)');
  
    promise_test(() => {
  
      const streamAndReader = factory();
      const stream = streamAndReader.stream;
      const reader = streamAndReader.reader;
  
      assert_true(stream.locked, 'stream should start locked');
  
      const promise = reader.closed.then(v => {
        assert_equals(v, undefined, 'reader closed should fulfill with undefined');
        assert_true(stream.locked, 'stream should remain locked');
      });
  
      reader.read();
      reader.read();
  
      return promise;
  
    }, 'draining the stream via read() should cause the reader closed promise to fulfill, but locked stays true');
  
    promise_test(() => {
  
      const streamAndReader = factory();
      const stream = streamAndReader.stream;
      const reader = streamAndReader.reader;
  
      const promise = reader.closed.then(() => {
        assert_true(stream.locked, 'the stream should start locked');
        reader.releaseLock(); // Releasing the lock after reader closed should not throw.
        assert_false(stream.locked, 'the stream should end unlocked');
      });
  
      reader.read();
      reader.read();
  
      return promise;
  
    }, 'releasing the lock after the stream is closed should cause locked to become false');
  
    promise_test(t => {
  
      const reader = factory().reader;
  
      reader.releaseLock();
  
      return Promise.all([
        promise_rejects(t, new TypeError(), reader.read()),
        promise_rejects(t, new TypeError(), reader.read()),
        promise_rejects(t, new TypeError(), reader.read())
      ]);
  
    }, 'releasing the lock should cause further read() calls to reject with a TypeError');
  
    promise_test(() => {
  
      const streamAndReader = factory();
      const stream = streamAndReader.stream;
      const reader = streamAndReader.reader;
  
      const readerClosed = reader.closed;
  
      assert_equals(reader.closed, readerClosed, 'accessing reader.closed twice in succession gives the same value');
  
      const promise = reader.read().then(() => {
        assert_equals(reader.closed, readerClosed, 'reader.closed is the same after read() fulfills');
  
        reader.releaseLock();
  
        assert_equals(reader.closed, readerClosed, 'reader.closed is the same after releasing the lock');
  
        const newReader = stream.getReader();
        return newReader.read();
      });
  
      assert_equals(reader.closed, readerClosed, 'reader.closed is the same after calling read()');
  
      return promise;
  
    }, 'reader\'s closed property always returns the same promise');
  };
  