PR Summary

• Removal of @group foobar annotation from Test_Modal_Manager class
  We have taken out a special label ('@group foobar') from the 'Test_Modal_Manager' class, which was no longer needed.
• Introduction of a new file and class
  A new file named 'class-test-modal.php' has been added, which introduces a class called 'Test_Modal'.
• Test of setup_hooks method
  The 'Test_Modal' class now includes a method for checking if the 'setup_hooks' function works as expected within the 'Modal' class. It achieves this by confirming the right filters are registered during setup.
• Validation of hooks associated with Modal class
  To guarantee the 'Modal' class functions as expected, we've established a list of expected hooks in the 'test_setup_hooks' method. This will ensure all the connections in the 'Modal' class are valid and successfully registered.