Update test

Author: xcatliu

examples/test.ts

@@ -1,2 +1,6 @@
-let a: undefined = null;
-let b: null = undefined;
+let xcatliu: [string, number];
+xcatliu[0] = 'Xcat Liu';
+xcatliu[1] = 25;
+
+xcatliu[0].slice(1);
+xcatliu[1].toFixed(2);