diff --git a/tests/test_gui.py b/tests/test_gui.py
index 0f089aa4..10123e7e 100644
--- a/tests/test_gui.py
+++ b/tests/test_gui.py
@@ -15,6 +15,7 @@ def close_figures_on_teardown():
 
 
 @pytest.mark.parametrize('root', ["./tests/example_data/pc",
+                                  "./tests/example_data/mn",
                                   "./tests/example_data/un"])
 def test_gui(root):
     if 'un' in root and 'h5py' not in sys.modules:
@@ -63,6 +64,7 @@ def test_gui(root):
 
 
 @pytest.mark.parametrize('root', ["./tests/example_data/pc",
+                                  "./tests/example_data/mn",
                                   "./tests/example_data/un"])
 def test_gui_params(root):
     if 'un' in root and 'h5py' not in sys.modules:
@@ -77,6 +79,7 @@ def test_gui_params(root):
 
 
 @pytest.mark.parametrize('root', ["./tests/example_data/pc",
+                                  "./tests/example_data/mn",
                                   "./tests/example_data/un"])
 def test_slider_reset_range(root):
     if 'un' in root and 'h5py' not in sys.modules: