feat: vuejs#149 add test for v-model.lazy

Author: thewei

src/directives/on.ts

@@ -78,4 +78,8 @@ export const on: Directive = ({ el, get, exp, arg, modifiers }) => {
   }
 
   listen(el, arg, handler, modifiers)
+
+  return () => {
+    el.removeEventListener(arg!, handler, modifiers)
+  }
 }

tests/model.html

@@ -22,6 +22,10 @@ <h2>Text Input</h2>
   {{ text }}
   <input v-model.trim="text" />
 
+  <h2>Text Input w/ lazy</h2>
+  {{ text }}
+  <input v-model.lazy="text" />
+
   <h2>TextArea</h2>
   {{ text }}
   <textarea v-model.trim="text"></textarea>