"a"
      }
    assertThat(result).isEqualTo("b")
    assertThat(atomicTags.get()[String::class]).isEqualTo("b")
  }

  @Test
  fun computeIfAbsentOnlyComputesOnceAfterRaceLost() {
    var computeCount = 0
    val tags = EmptyTags
    val atomicTags = AtomicReference<Tags>(tags)
    val result =
      atomicTags.computeIfAbsent(String::class) {
        computeCount++