clear out some ds_store files
diff --git a/tests/visual_tests/.gitignore b/tests/visual_tests/.gitignore
index 04bf55b..7d7bcad 100644
--- a/tests/visual_tests/.gitignore
+++ b/tests/visual_tests/.gitignore
@@ -7,3 +7,4 @@
 *.synctex.gz
 *.lot
 *.docx
+.DS_store