diff --git a/scripts/test/dot-chaining.toy b/scripts/test/dot-chaining.toy
index 54401e0..9231863 100644
--- a/scripts/test/dot-chaining.toy
+++ b/scripts/test/dot-chaining.toy
@@ -19,4 +19,12 @@ val
 	;
 
 
+//test the value is actually altered
+fn _increment(self) {
+	return self + 1;
+}
+
+assert 3.increment().increment() == 5, "dot chaining increment failed";
+
+
 print "All good";