Modified: refactored add_metabox to remove else expression
Modified: refactored add_help_tab to remove else expression
Removed: property overloading
Added: missing tests
Updated: PHPUnit configuration
Renamed to adhere to WordPress Coding Standards
Updated: comments
Removed: unnecessary properties and associated getters
Modified: removed static declaration from deprecated()
Renamed: base_model => class-base-model.php to adhere to WordPress Coding Standards