if (queue.futureTasks.isNotEmpty()) {
      readyQueues.add(queue)
    }
  }

  /**
   * Returns an immediately-executable task for the calling thread to execute, sleeping as necessary
   * until one is ready. If there are no ready queues, or if other threads have everything under
   * control this will return null. If there is more than a single task ready to execute immediately

import okhttp3.OkHttpClient
import okhttp3.TestUtil.threadFactory

/**
 * Runs a [TaskRunner] in a controlled environment so that everything is sequential and
 * deterministic.
 *
 * This class ensures that at most one thread is running at a time. This is initially the JUnit test
 * thread, which yields its execution privilege while calling [runTasks], [runNextTask], or
 * [advanceUntil]. These functions don't return until the task threads are all idle.

      "scheduledTasks=[task two, task one]",
    )

    taskFaker.advanceUntil(200.µs)
    assertThat(log).containsExactly(
      "scheduledTasks=[task two, task one]",
      "scheduledTasks=[task one]",
    )

    taskFaker.advanceUntil(300.µs)
    assertThat(log).containsExactly(
      "scheduledTasks=[task two, task one]",
      "scheduledTasks=[task one]",
      "scheduledTasks=[]",
    )