Task description

Write a list of things that need to be completed to achieve the goal of this issue.

- [ ] For the sake of TDD, write a test for the NCI kernel.
The prior test is deprecated. The dG is merged, so we can use passing as the acceptance criterion.

• Create a test for compute coupling. This should also provide an easy means to create / reference geometry and fields for other interface tests

Acceptance criteria

- [ ] The test provides an expected result to compare to in order to verify NCIs. Test should fail, as kernel is not implemented.

• The test passes