switch to beforemount hook & improve test timing logic

test/basic.spec.js

@@ -1,25 +1,29 @@
 import Vue from 'vue'
 import Meta from 'vue-meta'
 
+import { Promise } from 'es6-promise'
+
 Vue.use(Meta)
 
-before(() => {
-  new Vue({
-    template: `
-      <div id="app">
-      </div>
-    `,
-    metaInfo: {
-      title: 'Foo'
-    }
-  }).$mount()
-})
-
 describe('basic', () => {
-  it('sets the document title', (done) => {
-    setTimeout(() => {
-      expect(document.title).to.equal('Foo')
-      done()
-    }, 100)
+  const container = document.createElement('div')
+  let vm
+
+  function setMetaInfo (metaInfo) {
+    return new Promise((resolve) => {
+      vm = new Vue({ el: container, metaInfo })
+      vm.$on('vue-meta-update', resolve)
+    })
+  }
+
+  afterEach(() => vm.$destroy())
+
+  it('sets a title', () => setMetaInfo({ title: 'Foo' })
+    .then(() => expect(document.title).to.equal('Foo')))
+
+  it('sets a title with a template', () => setMetaInfo({
+    title: 'Foo',
+    titleTemplate: '%s Bar'
   })
+    .then(() => expect(document.title).to.equal('Foo Bar')))
 })