old_contents: import unittest
  
  class CollectionTests(unittest.TestCase):
  
      def cls(self):
          from statzlogger import Collection as cls
          return cls
      
      def init(self, *args, **kwargs):
          return self.cls()(*args, **kwargs)
  
new_contents: import unittest
  
  class CollectionTests(unittest.TestCase):
  
      def cls(self):
          from statzlogger import Collection as cls
          return cls
      
      def init(self, *args, **kwargs):
          return self.cls()(*args, **kwargs)
  
  if __name__ == "__main__":
      unittest.main()
  
subject: Add main().