Added comprehensive unit tests for DateHashPathGenerator to validate path generation
with and without directories, ensuring unique paths for identical files and proper
slugging of filenames.
- Implement tests for DiskName instantiation and validation.
- Add tests for FileStream instantiation and methods.
- Create tests for SanitizedFile instantiation and validation.
- Introduce TestDiskBackedEnum and TestDiskUnitEnum for testing purposes.
- Introduced Pest testing framework with basic test cases.
- Created TestCase and ExampleTest for unit testing.
- Updated phpunit.xml for improved test configuration.
