diff --git a/test/units/plugins/test_plugins.py b/test/units/plugins/test_plugins.py
index 3543cbc230c..e8b48afcf1f 100644
--- a/test/units/plugins/test_plugins.py
+++ b/test/units/plugins/test_plugins.py
@@ -75,7 +75,16 @@ class TestErrors(unittest.TestCase):
         #with patch('glob.glob', mock_glob):
         #    pass
 
-    def test_plugin__config(self):
+    def assertPluginLoaderConfigBecomes(self, arg, expected):
+        pl = PluginLoader('test', '', arg, 'test_plugin')
+        self.assertEqual(pl.config, expected)
+
+    def test_plugin__init_config_list(self):
         config = ['/one', '/two']
-        pl = PluginLoader('test', '', config, 'test_plugin')
-        self.assertEqual(pl.config, config)
+        self.assertPluginLoaderConfigBecomes(config, config)
+
+    def test_plugin__init_config_str(self):
+        self.assertPluginLoaderConfigBecomes('test', ['test'])
+
+    def test_plugin__init_config_none(self):
+        self.assertPluginLoaderConfigBecomes(None, [])