Re: [whatwg/streams] Add tests for TransformStream backpressure (#773)

domenic commented on this pull request.



> +
+promise_test(() => {
+  const ts = new TransformStream();
+  const writer = ts.writable.getWriter();
+  const reader = ts.readable.getReader();
+  const events = [];
+  writer.write('a').then(() => events.push('a'));
+  writer.write('b').then(() => events.push('b'));
+  writer.close().then(() => events.push('closed'));
+  return flushAsyncEvents().then(() => {
+    assert_array_equals(events, [], 'no writes should have resolved yet');
+    return reader.read();
+  }).then(({ value, done }) => {
+    assert_false(done, 'done should not be true');
+    assert_equals('a', value, 'value should be "a"');
+    return delay(0);

Those are pretty great explanations.

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