22   const rs = new ReadableStream();  constant
23   new ReadableStreamDefaultReader(rs); // Constructing directly the first time should be fine.
24   assert_throws_js(TypeError, () => new ReadableStreamDefaultReader(rs),
32   const rs = new ReadableStream();  constant
33   new ReadableStreamDefaultReader(rs); // Constructing directly should be fine.
34   assert_throws_js(TypeError, () => rs.getReader(), 'getReader() should fail');
41   const rs = new ReadableStream();  constant
42   rs.getReader(); // getReader() should be fine.
43 …assert_throws_js(TypeError, () => new ReadableStreamDefaultReader(rs), 'constructing directly shou…
49   const rs = new ReadableStream();  constant
50   rs.getReader(); // getReader() should be fine.
51   assert_throws_js(TypeError, () => rs.getReader(), 'getReader() should fail');
57   const rs = new ReadableStream({  constant
63   new ReadableStreamDefaultReader(rs); // Constructing directly should not throw.
70   const rs = new ReadableStream({  constant
76   new ReadableStreamDefaultReader(rs); // Constructing directly should not throw.
83   const rs = new ReadableStream({  constant
88   const reader = rs.getReader();
103   const rs = new ReadableStream({  constant
105       assert_true(rs.locked, 'the stream should still be locked');
106       assert_throws_js(TypeError, () => rs.getReader(), 'should not be able to get another reader');
112   const reader = rs.getReader();
120   const rs = new ReadableStream({  constant
126   const reader = rs.getReader();
137   const rs = new ReadableStream({  constant
143   const reader1 = rs.getReader();
147   const reader2 = rs.getReader();
160   const rs = new ReadableStream({  constant
166   const reader = rs.getReader();
186   const rs = new ReadableStream({  constant
192   const reader = rs.getReader();
210   const rs = new ReadableStream({  constant
218   const reader1 = rs.getReader();
224   const reader2 = rs.getReader();
235   const rs = new ReadableStream({  constant
241   const reader1 = rs.getReader();
244   const reader2 = rs.getReader();
258   const rs = new ReadableStream({  constant
267   const reader = rs.getReader();
271   const reader2 = rs.getReader();
289   const rs = new ReadableStream({  constant
295   const reader1 = rs.getReader();
302 …assert_throws_js(TypeError, () => rs.getReader(), 'trying to get another reader before erroring sh…
308   const reader2 = rs.getReader();
322   const rs = new ReadableStream({  constant
328   const promise = rs.getReader().closed.then(
343   const rs = new ReadableStream({  constant
349   return rs.getReader().read().then(
363   const rs = new ReadableStream({  constant
369   const promise = promise_rejects_exactly(t, theError, rs.getReader().closed);
380   const rs = new ReadableStream({  constant
389   rs.getReader().releaseLock();
391   return promise_rejects_exactly(t, theError, rs.getReader().closed);
398   const rs = new ReadableStream({  constant
403   const reader = rs.getReader();
423   const rs = new ReadableStream({  constant
430   const reader = rs.getReader();
447   const rs = new ReadableStream({  constant
456   const reader = rs.getReader();
469   const rs = new ReadableStream({  constant
476   const reader = rs.getReader();
490   const rs = new ReadableStream();  constant
498   assert_throws_js(TypeError, () => rs.getReader({ mode }), 'getReader() should throw');
503   const rs = new ReadableStream({  constant
509   const reader = rs.getReader();
519   const rs = new ReadableStream({  constant
525   const reader1 = rs.getReader();
531   const reader2 = rs.getReader();