feat: Add testing sample

Author: HamadTheIronside

index.test.ts

@@ -0,0 +1 @@
+type A = string & number & () => {}

tsconfig.json

@@ -15,6 +15,7 @@
   },
   "exclude": [
     "node_modules",
-    "dist"
+    "dist",
+    "**.test.ts"
   ]
 }