withTimeout always fails when using runTest

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1

I am writing unit tests for Android which use coroutines. I am using StandardTestDispatcher and runTest for that. At some point in my code there is a call to withTimeout(Long) function. All tests that call this function fail with TimeoutCancellationException. However everything works when I use runBlocking instead of runTest.

How can I avoid the exception and make tests pass?

Example declaration for unit tests is as follows:

class ExampleTest {

    @get:Rule
    val testInstantTaskExecutorRule: TestRule = InstantTaskExecutorRule()

    val mainDispatcher = StandardTestDispatcher()

    @Before
    open fun setUp() {
        Dispatchers.setMain(mainDispatcher)
    }

    @Test
    fun `example test`() = runTest {
        // code that calls withTimeout
    }

    @After
    open fun tearDown() {
        Dispatchers.resetMain()
    }
}