Hey peepz, how are you? I have a question regardi...

# getting-started

[Daniel Branco]

Hey peepz, how are you?

I have a question regarding Tests, @Nested, inner classes, ParametrizedTests + MethodSource

I have the following

class MyServiceTest {
   data class TestData(...)

   @Nested
   inner class MyServiceSpecific{
      private fun prepareTestData() = Stream.of(...)

      @ParameterizedTest
      @MethodSource("prepareTestData")
      fun `GIVEN this example WHEN executing test THEN should run`(data: Testdata) {
         // EVERYTHING I WANT TO TEST
      }
   }
}

With this structure I get the following error

Cannot invoke non-static method [private final java.util.stream.Stream... on a null target.

How can I gave all this working, I am missing a glue probably

[Daniel Branco]

I found the solution I need to tell JUnit that needs to create my inner class using

@TestInstance(TestInstance.Lifecycle.PER_CLASS)

But I thought that Nested annotation were doing that already from the enclosing class

[Benoît Liessens]

Have you tried removing the inner keyword?

[Daniel Branco]

According to @Nested documentation says that it should be a non static class, and inner do that for you