Add tests fixes

- Added filter to phpunit config
- This enables support for coverage support
- Moved unit tests to dedicated directory
- Also created constants for the locations

Add tests fixes

- Added filter to phpunit config
- This enables support for coverage support
- Moved unit tests to dedicated directory
- Also created constants for the locations of the fixtures and mocks for
testing so we do not have to use relative paths in tests
- Updated phpunit to 8
- Added type information to tests
- Added return type and parameter type declarations for tests
- Added strict types to tests
- CS fixes in tests
- Aligning arrays, consistent string concatenation, removed unused local
vars
- Added constant for test cache directory
- Make the autoloader also properly work on windows
- Windows does not care about the directory separator used so just trim
both variant from the end.

show more ...

Add dual PSR-4 compatible classes autoloader

This patch is a workaround until Composer installation step can be used
in production bugs.php.net. Once Composer can be added to the deploym

Add dual PSR-4 compatible classes autoloader

This patch is a workaround until Composer installation step can be used
in production bugs.php.net. Once Composer can be added to the deployment
step together with rsync this can be simplified and only Composer's
autoload.php will be used.

show more ...