input: Write a python function to initialize a plugin engine with a given plugins_path and verbose mode, and test it with assert statements.
  ```python
  assert KavMain().init("/path/to/plugins", True) == 0
  assert KavMain().init("/another/path", False) == 0
  assert KavMain().init("/yet/another/path") == 0
output: class KavMain:
      def __init__(self):
          self.plugins_path = None
          self.verbose = False
  
      def init(self, plugins_path, verbose=False):
          self.plugins_path = plugins_path
          self.verbose = verbose
          # Assuming that the initialization is always successful and returns 0
          return 0