diff --git a/flake8/plugins/manager.py b/flake8/plugins/manager.py
index 4a06c75..02a136c 100644
--- a/flake8/plugins/manager.py
+++ b/flake8/plugins/manager.py
@@ -152,16 +152,6 @@ class PluginManager(object):
         self.names = []
         self._load_all_plugins()
 
-    def __contains__(self, name):
-        """Check if the entry-point name is in this plugin manager."""
-        LOG.debug('Checking for "%s" in plugin manager.', name)
-        return name in self.plugins
-
-    def __getitem__(self, name):
-        """Retrieve a plugin by its entry-point name."""
-        LOG.debug('Retrieving plugin for "%s".', name)
-        return self.plugins[name]
-
     def _load_all_plugins(self):
         LOG.debug('Loading entry-points for "%s".', self.namespace)
         for entry_point in pkg_resources.iter_entry_points(self.namespace):
@@ -203,6 +193,16 @@ class PluginTypeManager(object):
         self.manager = PluginManager(self.namespace)
         self.plugins_loaded = False
 
+    def __contains__(self, name):
+        """Check if the entry-point name is in this plugin type manager."""
+        LOG.debug('Checking for "%s" in plugin type manager.', name)
+        return name in self.plugins
+
+    def __getitem__(self, name):
+        """Retrieve a plugin by its name."""
+        LOG.debug('Retrieving plugin for "%s".', name)
+        return self.plugins[name]
+
     @property
     def names(self):
         """Proxy attribute to underlying manager."""
diff --git a/tests/unit/test_plugin_manager.py b/tests/unit/test_plugin_manager.py
index 05073cf..8991b96 100644
--- a/tests/unit/test_plugin_manager.py
+++ b/tests/unit/test_plugin_manager.py
@@ -36,32 +36,6 @@ def test_calls_pkg_resources_creates_plugins_automaticaly(iter_entry_points):
     assert isinstance(plugin_mgr.plugins['T200'], manager.Plugin)
 
 
-@mock.patch('pkg_resources.iter_entry_points')
-def test_proxies_contains_to_plugins_dictionary(iter_entry_points):
-    """Verify that we can use the PluginManager like a dictionary."""
-    iter_entry_points.return_value = [
-        create_entry_point_mock('T100'),
-        create_entry_point_mock('T200'),
-    ]
-    plugin_mgr = manager.PluginManager(namespace='testing.pkg_resources')
-
-    assert 'T100' in plugin_mgr
-    assert 'T200' in plugin_mgr
-
-
-@mock.patch('pkg_resources.iter_entry_points')
-def test_proxies_getitem_to_plugins_dictionary(iter_entry_points):
-    """Verify that we can use the PluginManager like a dictionary."""
-    iter_entry_points.return_value = [
-        create_entry_point_mock('T100'),
-        create_entry_point_mock('T200'),
-    ]
-    plugin_mgr = manager.PluginManager(namespace='testing.pkg_resources')
-
-    assert isinstance(plugin_mgr['T100'], manager.Plugin)
-    assert isinstance(plugin_mgr['T200'], manager.Plugin)
-
-
 @mock.patch('pkg_resources.iter_entry_points')
 def test_handles_mapping_functions_across_plugins(iter_entry_points):
     """Verify we can use the PluginManager call functions on all plugins."""
@@ -71,6 +45,6 @@ def test_handles_mapping_functions_across_plugins(iter_entry_points):
     ]
     iter_entry_points.return_value = entry_point_mocks
     plugin_mgr = manager.PluginManager(namespace='testing.pkg_resources')
-    plugins = [plugin_mgr[name] for name in plugin_mgr.names]
+    plugins = [plugin_mgr.plugins[name] for name in plugin_mgr.names]
 
     assert list(plugin_mgr.map(lambda x: x)) == plugins
diff --git a/tests/unit/test_plugin_type_manager.py b/tests/unit/test_plugin_type_manager.py
index 2735dec..36fb92a 100644
--- a/tests/unit/test_plugin_type_manager.py
+++ b/tests/unit/test_plugin_type_manager.py
@@ -35,6 +35,13 @@ def create_mapping_manager_mock(plugins):
     return manager_mock
 
 
+def create_manager_with_plugins(plugins):
+    """Create a fake PluginManager with a plugins dictionary."""
+    manager_mock = mock.create_autospec(manager.PluginManager)
+    manager_mock.plugins = plugins
+    return manager_mock
+
+
 class TestType(manager.PluginTypeManager):
     """Fake PluginTypeManager."""
 
@@ -167,6 +174,32 @@ def test_provide_options(PluginManager):
                                                   extra_args)
 
 
+@mock.patch('flake8.plugins.manager.PluginManager')
+def test_proxy_contains_to_managers_plugins_dict(PluginManager):
+    """Verify that we proxy __contains__ to the manager's dictionary."""
+    plugins = {'T10%i' % i: create_plugin_mock() for i in range(8)}
+    # Return our PluginManager mock
+    PluginManager.return_value = create_manager_with_plugins(plugins)
+
+    type_mgr = TestType()
+    for i in range(8):
+        key = 'T10%i' % i
+        assert key in type_mgr
+
+
+@mock.patch('flake8.plugins.manager.PluginManager')
+def test_proxies_getitem_to_managers_plugins_dictionary(PluginManager):
+    """Verify that we can use the PluginTypeManager like a dictionary."""
+    plugins = {'T10%i' % i: create_plugin_mock() for i in range(8)}
+    # Return our PluginManager mock
+    PluginManager.return_value = create_manager_with_plugins(plugins)
+
+    type_mgr = TestType()
+    for i in range(8):
+        key = 'T10%i' % i
+        assert type_mgr[key] is plugins[key]
+
+
 class FakePluginTypeManager(manager.NotifierBuilder):
     """Provide an easy way to test the NotifierBuilder."""