diff --git a/tests/test_configuration.py b/tests/test_configuration.py
index 668c57b6..ba30f83d 100644
--- a/tests/test_configuration.py
+++ b/tests/test_configuration.py
@@ -71,7 +71,7 @@ class TestConfig(TestCase):
 
 	def test_bash(self):
 		from powerline.shell import ShellPowerline
-		args = Args(last_exit_code=1, ext=['shell'], renderer_module='bash_prompt', config=[('ext', {'shell': {'theme': 'default_leftonly'}})])
+		args = Args(last_exit_code=1, ext=['shell'], renderer_module='bash_prompt', config={'ext': {'shell': {'theme': 'default_leftonly'}}})
 		with ShellPowerline(args, run_once=False) as powerline:
 			powerline.render(segment_info={'args': args})
 		with ShellPowerline(args, run_once=False) as powerline: