diff --git a/tests/testutil.py b/tests/testutil.py
index c021e21493e6d04aa804501ff42fd25dfec36bec..d0cfc6698da34f8374d5c57eb41be5db422d3d5e 100644
--- a/tests/testutil.py
+++ b/tests/testutil.py
@@ -98,8 +98,14 @@ class Transaction:
 
 
 class TestConfig:
+    TESTS_DIR = Path(__file__).parent
+
     def __init__(self, repo_path=None):
-        self.repo_path = None if repo_path is None else Path(repo_path)
+        if repo_path is not None:
+            repo_path = Path(repo_path)
+            if not repo_path.is_absolute():
+                repo_path = Path(self.TESTS_DIR, repo_path)
+        self.repo_path = repo_path
 
     def repository_path(self):
         return self.repo_path