test: add e2e tests

fix: boolean attributes client side

test/components/keep-alive.vue

@@ -0,0 +1,28 @@
+<template>
+  <div>
+    <keep-alive>
+      <hello-world v-if="childVisible"></hello-world>
+    </keep-alive>
+  </div>
+</template>
+
+<script>
+import HelloWorld from './hello-world.vue'
+
+export default {
+  components: {
+    HelloWorld
+  },
+  metaInfo() {
+    return {
+      title: this.title,
+    }
+  },
+  data() {
+    return {
+      childVisible: true,
+      title: 'Alive World'
+    }
+  }
+}
+</script>