Using TestCoroutineDispatcher

What is TestCoroutineDispatcher

• This is a type of co-routine dispatcher that is used to test the coroutines.

class TestCoroutineDispatcher : CoroutineDispatcher, Delay, DelayController

• As seen above the testCoroutineDispatcher extends the classes coroutineDispatcher, delay, delayController.
• It performs immediate and lazy execution of co-routines.
• By default testCoroutineDispatcher is immediate meaning any tasks that are scheduled to run immediately is executed immediately
• If there is a delay the virtual clock is advanced by the amount of delay involved.

Usage in clean architecture

• Using this mechanism mentioned above we can swap dispatchers in use case and the test case for the corresponding use case