--- a
+++ b/tests/util/test_basic.py
@@ -0,0 +1,9 @@
+from pathaia.util.basic import ifnone
+
+
+def test_ifnone():
+    a = None
+    b = 1
+    assert ifnone(a, b) == b
+    a = 2
+    assert ifnone(a, b) == a