diff --git a/tests/when.scm b/tests/when.scm
new file mode 100644
index 00000000..8a8a2089
--- /dev/null
+++ b/tests/when.scm
@@ -0,0 +1,9 @@
+(import (scheme base) (scheme write))
+(define-syntax when
+  (syntax-rules ()
+    ((when test result1 result2 ...)
+     (if test
+         (begin result1 result2 ...)))))
+
+(write
+  (when #t 1))