diff --git a/test/overall_test.py b/test/overall_test.py
index b224671..59083d7 100644
--- a/test/overall_test.py
+++ b/test/overall_test.py
@@ -46,7 +46,7 @@ True
 'Everything seems good.'
 >>> g.plot(color='red')
 >>> g.plot(color='red', bgcolor='black')
->>> result = g.save_image("test2.png")
+>>> result = g.save_image("test2.png", depth=5)
 >>> result["status"]
 True
 >>> result["message"]