set("b", "b", "b")
    while (taskFaker.isIdle()) {
      assertValue("a", "a", "a")
      assertValue("b", "b", "b")
    }
  }

  @ParameterizedTest
  @ArgumentsSource(FileSystemParamProvider::class)
  fun rebuildJournalOnRepeatedEdits(parameters: Pair<FileSystem, Boolean>) {
    setUp(parameters.first, parameters.second)
    while (taskFaker.isIdle()) {
      set("a", "a", "a")
      set("b", "b", "b")

      sink: MutableCollection<in T>,
      maxElements: Int,
    ) = error("unsupported")
  }

  /** Returns true if no tasks have been scheduled. This runs the coordinator for confirmation. */
  fun isIdle() = taskRunner.activeQueues().isEmpty()

  override fun close() {
    tasksExecutor.shutdownNow()
  }

  companion object {
    var instance = 0

    @JvmField