chore: add test for changed fn context

test/fixtures/changed.vue

@@ -0,0 +1,26 @@
+<template>
+  <div>
+    <hello-world v-if="childVisible"></hello-world>
+  </div>
+</template>
+
+<script>
+import HelloWorld from './hello-world.vue'
+
+export default {
+  components: {
+    HelloWorld
+  },
+  metaInfo() {
+    return {
+      changed: this.changed
+    }
+  },
+  data() {
+    return {
+      childVisible: false,
+      changed: () => {}
+    }
+  }
+}
+</script>