Micronaut is unable to inject dependencies into nested tests when using KSP

[cainecridland]

Expected Behavior

If a @MicronautTest test and its injected dependencies are within a nested class, the dependencies are injected when the test in the nested class runs.

Actual Behaviour

The dependencies are not injected, leading to the following error: kotlin.UninitializedPropertyAccessException: lateinit property has not been initialized

Steps To Reproduce

Reproduction steps are available in the README of the example application below, but generally:

1. Create a test class that uses the @MicronautTest annotation
2. Create a nested inner class (with the @Nested annotation) containing dependencies injected using the @Inject annotation
3. Create a test within the inner class that uses the injected dependencies.
4. The test will fail, but will pass if you move everything outside of the nested inner class.

Environment Information

• Kotlin 2.0
• JDK 17

Example Application

https://github.com/cainecridland/micronaut-nested-test-injection-problem-example

Version

4.4.0

[nilols]

A workaround seems to be constructor-based injection