diff --git a/tests/test_monitor.py b/tests/test_monitor.py
index 8b34c11..2b26431 100644
--- a/tests/test_monitor.py
+++ b/tests/test_monitor.py
@@ -21,9 +21,11 @@ def test_parse_modes(test_data):
     m = Monitor(data)
     assert len(m.modes) == 9
     assert m.enabled
+    assert m.primary
 
 
 def test_disabled_monitor(test_data):
     data = test_data.read("disabled_monitor.txt", deserialize=False).splitlines()
     m = Monitor(data)
     assert m.enabled is False
+    assert m.primary is False