Add unit tests for `benchmark.py` basic scenarios

[panagiotisbellias]

Description:
Add unit tests for common usage scenarios in benchmark.py.

Steps:

• Create a new test file (e.g., tests/test_benchmark.py)
• Write tests for typical use cases of benchmark functions
• Run tests and confirm they pass

Acceptance Criteria:

• At least 3 new unit tests added
• All tests pass in CI

[akarlaraytu]

Excellent suggestion! A solid test suite is key to the project's long-term stability. I agree that adding unit tests for the benchmark scenarios is a high-priority goal.