Start tests for PluginManager

tests/unit/test_plugin_manager.py

@@ -0,0 +1,13 @@
+"""Tests for flake8.plugins.manager.PluginManager."""
+import mock
+
+from flake8.plugins import manager
+
+
+@mock.patch('pkg_resources.iter_entry_points')
+def test_calls_pkg_resources_on_instantiation(iter_entry_points):
+    """Verify that we call iter_entry_points when we create a manager."""
+    iter_entry_points.return_value = []
+    manager.PluginManager(namespace='testing.pkg_resources')
+
+    iter_entry_points.assert_called_once_with('testing.pkg_resources')