title: Override the class patch with method patch (decorator)
body: <p>I have several test methods in a class that use one type of patching for a object, so I have patched with class decorator. For a single another method i want to patch the same object differently. I tried the following approach, but the patch made as class decorator is in effect despite the method itself being decorated with different patch. I expected method patch to override class patch. Why is this not the case?</p>
  
  <p>In this particular case I can remove class patch and patch individual methods, but that would be repetitive. How can I implement such overriding (method overrides class patch) mechanism?  </p>
  
  <pre><code>from unittest TestCase
  from unittest import mock
  
  @mock.patch('my_module.cls.method', mock.Mock(side_effect=RuntimeError('testing'))
  class SwitchViewTest(TestCase):
  
      def test_use_class_patching(self):
          # several other methods like this
          # test code ..
  
      @mock.patch('my_module.cls.method', mock.Mock(side_effect=RuntimeError('custom'))
      def test_override_class_patching(self):
          # test code ...
  </code></pre>