diff --git a/.gitignore b/.gitignore
index b4b3f518..f119c327 100644
--- a/.gitignore
+++ b/.gitignore
@@ -59,3 +59,8 @@ tmp/
 
 # Local files
 Gemini Starter.rtf
+
+# Test harness scratch directories
+tests/.tmp/
+tests/reports/*
+!tests/reports/.gitkeep
diff --git a/tests/reports/.gitkeep b/tests/reports/.gitkeep
new file mode 100644
index 00000000..e69de29b