Re: [whatwg/streams] Add TransformStreamDefaultController terminate() method (#818)

ricea commented on this pull request.



> +}, 'controller.enqueue() should throw after controller.terminate()');
+
+const error1 = new Error('error1');
+error1.name = 'error1';
+
+promise_test(t => {
+  const ts = new TransformStream({
+    start(controller) {
+      controller.enqueue(0);
+      controller.terminate();
+      controller.error(error1);
+    }
+  });
+  return Promise.all([
+    promise_rejects(t, new TypeError(), ts.writable.abort(), 'abort() should reject with a TypeError'),
+    promise_rejects(t, error1, ts.readable.cancel(), 'cancel() should reject with error1')

.cancel() is actually pretty specific. I added reader.closed to the tests just to be sure. I don't want to get into testing Readablestream itself here.

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