Kotlin Mock Data Class. One of the most common issues for Kotlin as we talked about in a previous article is that all classes and functions are closed by default This means that if you want to mock a class (something that may be quite common in Java testing) you need to either open it with the reserved keyword open or extract an interface .
All Kotlin Classes are Final by default Now there are two ways to do it Let’s talk about them one by one Firstly we can make the Utility class open and then can we test the class using the above codeThis can be a problem as because now we have to change the code base Secondly and most importantly Mockito 210 provided a new update where we can mock the final classes.
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Kotlin Test Libraries Kotest for Assertions Mock Handling Final By Default Use MockK Create Mocks Once Handle Classes with State Utilize Data Classes Data Classes for Assertions Single Objects Lists Other Useful Kotests Assertions Group Assertions With Kotest’s asClue Data Classes for Parameterized Tests Helper Functions.
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A fake is a concrete class instance filled with inconsequential data Nullables are null Booleans are false Numerics are 0 Strings are “” Enums are their first declared value You can only.
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I had this problem just now and solved it with an inline argumentCaptor from mockitokotlin argumentCaptor ()apply { verify (myClass times (2))setItems (capture ()) assertEquals (2 allValuessize) assertEquals (“test” firstValue) } firstValue is a reference to the first captured object.
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When you declare an object in Kotlin what is happening is that a class ( IntentGenerator in this case) is created with a private constructor and a static INSTANCE method That is a singleton Replace IntentGeneratorINSTANCE value with your own mocked instance The full method would look like thisCode sampleval intent Intent = mock()whenever(intentaction)thenReturn(“meow”)objectMockk(IntentGenerator)use { every { IntentGeneratornewIntent(any()) } returns intent AssertassertEquals(“meow” IntentGeneratornewIntent(mock())action)Was this helpful?Thanks! 2018060720160410.