assertThat(a.takeEvent()).isInstanceOf<CallStart>()
    assertThat(a.eventSequence).isEmpty()
  }

  /** Make sure we didn't mess up our special case for combining aggregates. */
  @Test
  fun moreThanTwoAggregation() {
    val a = EventRecorder(enforceOrder = false)
    val b = EventRecorder(enforceOrder = false)
    val c = EventRecorder(enforceOrder = false)
    val d = EventRecorder(enforceOrder = false)