diff --git a/able-script-test/hello_world.able b/able-script-test/hello-world.able
similarity index 100%
rename from able-script-test/hello_world.able
rename to able-script-test/hello-world.able
diff --git a/able-script-test/pass-by-reference.able b/able-script-test/pass-by-reference.able
new file mode 100644
index 0000000..2787104
--- /dev/null
+++ b/able-script-test/pass-by-reference.able
@@ -0,0 +1,17 @@
+owo Pass-by-reference test
+
+owo Swap two variables.
+functio swap(left, right) {
+    var tmp = left;
+    left = right;
+    right = tmp;
+}
+
+var foo = "hello";
+var bar = "world";
+
+swap(foo, bar);
+
+owo Should print "hello", then "world"
+bar print;
+foo print;