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Project goals:

• Getting some experience writing kotlin for prod and test code
• Trying the MVVM pattern out
• Trying out how having a Android instead of a POJO prenter impacts testing
• Trying out Dagger 2
• Integrating Travis CI or some other cloud service for testing

Open questions:

• how do I mock a kotlin class with mockito? is it even possible? Something like AppPreferences::class returns a kotlin.reflect.KClass reference and not a java.lang.Class one, needed by mockito. Using AppPreferences::class.java returns the java class but the mocking does not work.

Gotchas

• when mocking a method defined in a kotlin class, the parameters must be optionals in order for the mocking to work, otherwise the tests will fail with an java.lang.IllegalStateException: any (SomeClass::class.java) must not be null
• when mocking a kotlin class it is necessary to create an interface and mock it instead of the implementation, otherwise the mocks won' work. Is there a better way to do this?

Pains

• Make the app build on Travis CI:
  • the lintVital task always failed with PermGen out of memory. The solution was to add this config line in the Travis yml file: GRADLE_OPTS="$GRADLE_OPTS -XX:MaxPermSize=256m"