Constructor injected closable resource in a ParameterResolver

[roded]

Hello,
I have a TypeBasedParameterResolver which I use to inject an object borrowed from a pool (FTP connections) into a test class' constructor.

This test class's test methods are running in parallel, so for every test method, JUnit is creating a new instance of the test class and injecting it with a borrowed object.

I have a problem though: It seems like the ExtensionContext at the constructor injection point is relevant for the entire test class and not the specific test method. So I can't seem to get a method related context onto which to attach a CloseableResource so that when the method's exection is done, will return the borrowed object to the pool. Is this the intended behaviour: values injected into the constructor of a test class should be applicable to the test class context?

I imagine that this is an issue only for constructor injection and that if I used @BeforeEach, then the ExtensionContext will be applicable to the currently executing test method. However, I do enjoy my fields being final.

Any input much appreciated.
Cheers.

[marcphilipp]

Your description is accurate. In #4057, we've just implemented an opt-in solution to address this issue, but it's not released, yet.