10   const rs = new ReadableStream();  constant
11   const result = rs.tee();
22   const rs = new ReadableStream({  constant
30   const branch = rs.tee();
59   const rs = new ReadableStream({  constant
65   const branch = rs.tee();
80   const rs = new ReadableStream({  constant
90   const branches = rs.tee();
115   const rs = new ReadableStream({  constant
123   const branches = rs.tee();
141   const rs = new ReadableStream({  constant
149   const branches = rs.tee();
200   const rs = new ReadableStream({  constant
206   const branches = rs.tee();
220   const rs = new ReadableStream({  constant
226   const branches = rs.tee();
244   const rs = new ReadableStream({  constant
250   const [reader1, reader2] = rs.tee().map(branch => branch.getReader());
274   const rs = new ReadableStream({  constant
280   const [reader1, reader2] = rs.tee().map(branch => branch.getReader());
294   const rs = new ReadableStream({});  constant
296   const [branch1, branch2] = rs.tee();
309   const rs = new ReadableStream({  constant
315   const [branch1, branch2] = rs.tee();
355   const rs = recordingReadableStream({}, { highWaterMark: 0 });  constant
359   rs.tee();
361     assert_array_equals(rs.events, ['pull'], 'pull should only be called once');
368   const rs = recordingReadableStream({  constant
374   const [reader1, reader2] = rs.tee().map(branch => branch.getReader());
377     assert_array_equals(rs.events, ['pull', 'pull'], 'pull should be called twice');
384   const rs = recordingReadableStream({}, { highWaterMark: 0 });  constant
387   rs.controller.error(theError);
389   const [reader1, reader2] = rs.tee().map(branch => branch.getReader());
392     assert_array_equals(rs.events, [], 'pull should not be called');
405     const rs = recordingReadableStream({}, { highWaterMark: 0 });  constant
408     const [reader1, reader2] = rs.tee().map(branch => branch.getReader());
411       assert_array_equals(rs.events, ['pull'], 'pull should be called once');
413       rs.controller.enqueue('a');
418       assert_array_equals(rs.events, ['pull', 'pull'], 'pull should be called twice');
420       rs.controller.error(theError);
427       assert_array_equals(rs.events, ['pull', 'pull'], 'pull should be called twice');
435   const rs = recordingReadableStream({}, { highWaterMark: 0 });  constant
438   const [reader1, reader2] = rs.tee().map(branch => branch.getReader());
441     assert_array_equals(rs.events, ['pull'], 'pull should be called once');
443     rs.controller.enqueue('a');
447     assert_array_equals(rs.events, ['pull', 'pull'], 'pull should be called twice');
449     rs.controller.error(theError);
456     assert_array_equals(rs.events, ['pull', 'pull'], 'pull should be called twice');
463   const rs = recordingReadableStream();  constant
465   const [reader1, reader2] = rs.tee().map(branch => branch.getReader());
470   rs.controller.enqueue('a');
471   rs.controller.close();