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kotlinlang

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

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

Have you tried removing the `inner` keyword? 

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