step4Waiter.awaitReturned();
    assertThat(getFinalValue(step4)).isEqualTo("value 4");

    // Step 4's closeable is now closed.
    assertClosed(closeable4);
    // Step 3 still never ran, so its closeable should still be open.
    assertStillOpen(closeable3);
  }

  public void testTransform() throws Exception {
    ClosingFuture<String> closingFuture =

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