I'm trying to synchronize some calls in an okhttp ...

# coroutines

[Michal Klimczak]

I'm trying to synchronize some calls in an okhttp authenticator and it works fine, but I'm having troubles testing it. To simplify things I reduced it to such test (in 🧵)- the important part is that anImportantBlockingCall resembles okhttp.Authenticator.uthenticate - it's a blocking call, which in my case will run a runBlocking coroutine which will synchronise a few things and wait for them. So it really is important that in this test case this remains blocking. 🧵

[Michal Klimczak]

The test works fine if I wrap anImportantBlockingCall into thread instead of launch and do some Thread.sleeps instead of advancing virtual coroutine time. but this is what I'm trying to avoid.

concurrentTestScope was me trying to hack it, but it doesn't seem to do it concurrently to the testScope this way 😉

Any hints?

@Test
    fun test() {

        val testScope = TestCoroutineScope()
        val concurrentTestScope = TestCoroutineScope()

        fun anImportantBlockingCall() {
            runBlocking(concurrentTestScope.coroutineContext) {
                delay(100)
                println("C")
            }
        }
        
        testScope.runBlockingTest {
            println("A")
            launch {
                anImportantBlockingCall()
            }
            println("B")
        }

    }