}

    val idleLatch1 = redQueue.idleLatch()
    val idleLatch2 = redQueue.idleLatch()
    assertThat(idleLatch2).isSameAs(idleLatch1)
  }

  @Test fun cancelAllWhenEmptyDoesNotStartWorkerThread() {
    redQueue.execute("red task", 100.µs) {
      error("expected to be canceled")
    }
    assertThat(taskFaker.executeCallCount).isEqualTo(1)

    blueQueue.execute("task", 100.µs) {