Closes #115

Proposed Approach

I'd like to take this on. Looking at the repo structure, I can see we're working with a Scarb project (Cairo toolchain) — I'll make sure the testing setup aligns with how Scarb handles test execution and respects the .tool-versions constraints.

Here's how I'd approach it:

1. Check the Makefile for existing test targets and integrate the Apply testing logic there
2. Add test cases to the relevant test modules, following the pattern I see in the current test structure
3. Wire up the Cairo test runner to handle the Apply-specific scenarios
4. Run through locally with Scarb to verify everything's wired correctly

I've worked with Scarb setups before, so I know the build/test cycle well. Can have a PR ready tomorrow.

Acceptance Criteria

Lorem...

Implementation in progress — will remove [WIP] once code is ready.