}
          log += "scheduledTasks=${redQueue.scheduledTasks}"
          return -1L
        }
      }
    redQueue.schedule(task, 100.µs)

    redQueue.execute("task two", 200.µs) {
      log += "scheduledTasks=${redQueue.scheduledTasks}"
    }

    taskFaker.advanceUntil(100.µs)
    assertThat(log).containsExactly(
      "scheduledTasks=[task two, task one]",
    )

  /**
   * Returns a snapshot of tasks currently scheduled for execution. Does not include the
   * currently-executing task unless it is also scheduled for future execution.
   */
  val scheduledTasks: List<Task>
    get() = taskRunner.lock.withLock { futureTasks.toList() }

  /**
   * Schedules [task] for execution in [delayNanos]. A task may only have one future execution