diff --git a/tests/basics/string-format.py b/tests/basics/string-format.py
index 290030a9e3..8049c6f73b 100644
--- a/tests/basics/string-format.py
+++ b/tests/basics/string-format.py
@@ -58,6 +58,9 @@ test("{:10.4f}", 123.456)
 test("{:10.4f}", -123.456)
 test("{:10.4g}", 123.456)
 test("{:10.4g}", -123.456)
+test("{:e}", 100)
+test("{:f}", 200)
+test("{:g}", 300)
 
 test("{:10.4E}", 123.456)
 test("{:10.4E}", -123.456)