chore: Test Utils

[refcell]

Description

Increases test coverage, refactoring test utilities.

[codecov]

Codecov Report

Attention: Patch coverage is 77.95276% with 28 lines in your changes missing coverage. Please review.

Project coverage is 83.1%. Comparing base (a9dd0e7) to head (7a8c763).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/providers/src/test_utils.rs	69.5%	28 Missing ⚠️

Additional details and impacted files

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