Create Unit Tests for gherkin_checker Project Library

[dikako]

Description:
Currently, the gherkin_checker library lacks unit tests, which are essential to ensure functionality, maintain code quality, and prevent regressions. This issue aims to add comprehensive unit tests for the main components of the library.

Tasks:

Identify key functions and classes in the gherkin_checker library that require unit tests.
Write unit tests for each function and class, covering both typical and edge cases.
Ensure tests are written with clear assertions and meaningful test names.
Verify test coverage and confirm that all tests pass without errors.
Document any setup or dependencies required for running the tests.
Adding these unit tests will improve the reliability and robustness of the gherkin_checker library.