fun testTightRope() = runBlocking {
    fun exit(): Nothing = unreachable()
    fun ensure(precondition: Boolean): Nothing = unreachable()
    TightRopeTracker.use("test") {
        val chan = Channel<Int>(capacity = 1)

        println("Test 1 started")
        // job1 must complete as job2 is awaiting
        val job1 = launch { sendAndAwait { delay(1000).also { chan.send(1) } } }
        delay(50)
        val job2 = launch { sendAndAwait { delay(500).also { check(chan.receive() == 1) } } }
        delay(100)
        job1.cancel()

        delay(5000)
        println("Job1 ${job1.isCompleted}")
        println("Job2 ${job2.isCompleted}")
        println("Test 1 passed")

        println("Test 2 started")
        // job3 must not complete as no awaiters
        val job3 = launch { sendAndAwait { delay(1000) } }
        delay(500)
        job3.cancel()

        delay(5000)
        println("Test 2 passed")

        println("Test 3 started")
        // job4 must not complete as cancel happens before awaiters added
        val job4 = launch { sendAndAwait { delay(1000).also { exit() } } }
        delay(100)
        val job5 = launch {
            job4.cancel()
            sendAndAwait { delay(500) }
        }

        delay(5000)
        println("Test 3 passed")

        println("Test 4 started")
        // job6 must not complete as awaiters all gone
        // job7 must not enter sendAndAwait content
        val job6 = launch { sendAndAwait { delay(1000).also { exit() } } }
        val job7 = launch { sendAndAwait { delay(1000).also { exit() } } }
        delay(200)
        job6.cancel()
        job7.cancel()

        delay(5000)
        println("Test 4 passed")

        println("Test 5 started")
        // job9 ust not enter sendAndAwait content as it's cancelled before job8 completed
        val job8 = launch { sendAndAwait { delay(1000) } }
        val job9 = launch { sendAndAwait { exit() } }
        val job10 = launch { sendAndAwait { delay(1000) } }
        job9.cancel()
        delay(5000)
        println("Test 5 passed")
    }
}