Implemented unit tests for Forum Parser class.
Added and integrated OHHTTPStubs.
Started Forum Category Repository unit test implementation.
Implemented some changes to the String extensions.
Implemented unit tests for Forum Category repository with fake data.
Implemented unit tests for Forum Thread repository with fake data.
Small refactoring of Forum Category repository tests.
Implemented unit tests for Forum Post repository with fake data.
Added file path checks to forum repository tests to prevent false positives.
Merge branch 'feature/forum-tests' into develop