Simplify plugin test cleanup

satpy/tests/test_config.py

@@ -118,6 +118,8 @@ def fake_plugin_etc_path(
     with mock.patch("satpy._config.entry_points", fake_iter_entry_points), \
             mock.patch("satpy._config.impr_files", fake_importlib_files):
         yield etc_path
+    # if this path was used to load entry points then we need to clear the cache
+    cached_entry_point.cache_clear()
 
 
 def _get_entry_points_and_etc_paths(
@@ -289,19 +291,6 @@ def _create_yamlbased_plugin(
 class TestPluginsConfigs:
     """Test that plugins are working."""
 
-    @classmethod
-    def setup_class(cls):
-        """Set up the class of tests with a clean environment."""
-        cached_entry_point.cache_clear()
-
-    def teardown_method(self):
-        """Tear down the test.
-
-        Make sure we leave every test the way we started.
-
-        """
-        cached_entry_point.cache_clear()
-
     def test_get_plugin_configs(self, fake_composite_plugin_etc_path):
         """Check that the plugin configs are looked for."""
         from satpy._config import get_entry_points_config_dirs