diff --git a/test/mod/test_util_path.py b/test/mod/test_util_path.py
new file mode 100644
index 00000000..537b0375
--- /dev/null
+++ b/test/mod/test_util_path.py
@@ -0,0 +1,20 @@
+#
+# Tests for the 'osbuild.util.path' module
+#
+import os
+
+from osbuild.util import path
+
+def test_in_tree():
+    cases = {
+        ("/tmp/file", "/tmp", False): True,  # Simple, non-existent
+        ("/etc", "/", True): True,  # Simple, should exist
+        ("/tmp/../../file", "/tmp", False): False,  # Relative path escape
+        ("/very/fake/directory/and/file", "/very", False): True,  # non-existent, OK
+        ("/very/fake/directory/and/file", "/very", True): False,  # non-existent, not-OK
+        ("../..", os.path.abspath("."), False): False,  # Relative path escape from cwd
+        (".", os.path.abspath("../.."), False): True,  # cwd inside parent of parent
+    }
+
+    for args, expected in cases.items():
+        assert path.in_tree(*args) == expected, args