Odtnhj

I came across this limitation when trying to mock a class that refers to classes present in SDK >= 26 and executed the test in a device running SDK 24.
I created a test app to better understand the problem.

open class RandomStuff

 @RequiresApi(Build.VERSION_CODES.O)
 fun createDefaultNotificationChannel(): NotificationChannel 
 return NotificationChannel("test", "test", NotificationManager.IMPORTANCE_DEFAULT)
 

 fun testString(): String = "This is a test string"

Note that the RandomStuff class refers to the NotificationChannel class, only found in SDK >=26.

The test object provided via Dagger is the following:

@Module
class AppTestModule : AppModule() 

 @Provides
 override fun provideRandomStuff(): RandomStuff 

 return mock(RandomStuff::class.java)
 

mock will fail with this exception:
java.lang.IllegalArgumentException: Could not create type
at provideRandomStuff(AppTestModule.kt) ultimately caused by a
ClassNotFoundException thrown by ByteBuddy (a component used by Mockito).
I was able to work around this issue by adding some checks to my provide method:

@Module
class AppTestModule : AppModule() 

 @Provides
 override fun provideRandomStuff(): RandomStuff? 
 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) 
 return mock(RandomStuff::class.java)
 else 
 return null
 
 

This temporary solution is very intrusive since now, the production code has to take into consideration that RandomStuff may be null.
I call this a limitation since Mockito has always been promoted as a unit testing framework it does not seem that the Dagger + Espresso + Mockito is a fully supported combination.
Is there a more creative solution for this issue?