Re: [whatwg/streams] Port remaining TransformStream tests to wpt (#762)

tyoshino commented on this pull request.



> +      t.step(() => assert_unreached('transform must never be called if start() fails'));
+    },
+    flush() {
+      t.step(() => assert_unreached('flush must never be called if start() fails'));
+    }
+  });
+
+  const writer = ts.writable.getWriter();
+  writer.write('a').then(t.step_func(() => {
+    assert_unreached('writer should be errored if start() fails');
+  }))
+  .catch(t.step_func(e => assert_equals(e, thrownError, 'writer rejects with same error')));
+  writer.close().then(t.step_func(() => {
+    assert_unreached('writer should be errored if start() fails');
+  }))
+  .catch(t.step_func(e => assert_equals(e, thrownError, 'writer rejects with same error')));

OK. Great!

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