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

ricea commented on this pull request.



> @@ -0,0 +1,112 @@
+'use strict';
+
+if (self.importScripts) {
+  self.importScripts('/resources/testharness.js', '../resources/recording-streams.js', '../resources/test-utils.js');
+}
+
+promise_test(() => {
+  const ts = recordingIdentityTransformStream();
+  const writer = ts.writable.getWriter();
+  writer.write('a');
+  writer.write('b');
+  return delay(0).then(() => {
+    assert_array_equals(ts.events, ['transform', 'a'], 'transform should be called once');
+  });
+}, 'transform() should be called once with default identity transform');

It must be confusing, because the second chunk is being blocked by backpressure.

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