diff --git a/.gitignore b/.gitignore
index 369e759..05622b7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,6 +37,7 @@ pip-log.txt
 pip-delete-this-directory.txt
 
 # Unit test / coverage reports
+test-cert/
 htmlcov/
 .tox/
 .nox/