[REFAC] Black box full event derivation tests

[NDStrahilevitz]

Prerequisites

Select one OR another:

• [ ] I have discussed the refactoring idea with one (or another) maintainer.
• [x] I'll create a PR to implement this refactoring idea (assign to yourself).
• [ ] Someone else should implement this (describe it well).

Refactoring description

We should have black box unit tests for our event derivations. This requires adding (probably partial) interfaces to external dependencies such as containers and the kernel symbol table.