Refactor some unit test code with 'rstest'

[utilForever]

This revision includes:

• Refactor some unit test code with 'rstest' (Resolves 일부 유닛 테스트를 rstest로 대체 #43)

[Copilot]

Pull Request Overview

This PR refactors unit tests to use the rstest crate for parameterized testing instead of individual test functions with repetitive assertions. The change improves test maintainability by consolidating multiple similar test cases into single parameterized test functions.

• Replaced four individual test functions with four parameterized test functions using rstest
• Added rstest dependency to enable parameterized testing functionality

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/file_manager/models.rs	Refactored unit tests from individual functions to parameterized tests using rstest
Cargo.toml	Added rstest crate as a dev dependency

Comments suppressed due to low confidence (2)

src/file_manager/models.rs:99

• [nitpick] The function name 'fail_to_parse_language_from_invalid_filename' is inconsistent with the original 'fails_to_parse_language_from_invalid_filename'. Consider using 'fails_to_parse_language_from_invalid_filename' to maintain consistency with the original naming convention.

    fn fail_to_parse_language_from_invalid_filename(

src/file_manager/models.rs:126

• [nitpick] The function name 'fail_to_parse_language_from_invalid_extension' is inconsistent with the original 'fails_to_parse_language_from_invalid_extension'. Consider using 'fails_to_parse_language_from_invalid_extension' to maintain consistency with the original naming convention.

    fn fail_to_parse_language_from_invalid_extension(

[w8385]

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