fix: Sanitize head to use titleTemplate as function

lib/app/App.js

@@ -15,7 +15,7 @@ layoutsKeys.forEach(function (key, i) { %>
 let resolvedLayouts = {}
 
 export default {
-  head: <%= JSON.stringify(head) %>,
+  head: <%= serialize(head).replace('titleTemplate(', 'function(') %>,
   render(h, props) {
     <% if (loading) { %>const loadingEl = h('nuxt-loading', { ref: 'loading' })<% } %>
     const layoutEl = h(this.nuxt.err ? 'nuxt' : this.layout, {

test/basic.test.js

@@ -13,7 +13,12 @@ let nuxt = null
 test.before('Init Nuxt.js', async t => {
   const options = {
     rootDir: resolve(__dirname, 'fixtures/basic'),
-    dev: false
+    dev: false,
+    head: {
+      titleTemplate (titleChunk) {
+        return titleChunk ? `${titleChunk} - Nuxt.js` : 'Nuxt.js'
+      }
+    }
   }
   nuxt = new Nuxt(options)
   await new Builder(nuxt).build()
@@ -53,7 +58,7 @@ test('/head', async t => {
   const window = await nuxt.renderAndGetWindow(url('/head'), { virtualConsole: false })
   const html = window.document.body.innerHTML
   const metas = window.document.getElementsByTagName('meta')
-  t.is(window.document.title, 'My title')
+  t.is(window.document.title, 'My title - Nuxt.js')
   t.is(metas[0].getAttribute('content'), 'my meta')
   t.true(html.includes('<div><h1>I can haz meta tags</h1></div>'))
 })
@@ -103,6 +108,7 @@ test('/redirect -> check redirected source', async t => {
 
 test('/special-state -> check window.__NUXT__.test = true', async t => {
   const window = await nuxt.renderAndGetWindow(url('/special-state'))
+  t.is(window.document.title, 'Nuxt.js')
   t.is(window.__NUXT__.test, true)
 })