[tests] ensure global styles are inlined

test/fixtures/with-config/assets/app.css

@@ -0,0 +1,3 @@
+.global-css-selector {
+  color: red;
+}

test/fixtures/with-config/nuxt.config.js

@@ -31,5 +31,8 @@ module.exports = {
     extend (config, options) {
       config.devtool = 'nosources-source-map'
     }
-  }
+  },
+  css: [
+    {src: '~/assets/app.css'}
+  ]
 }

test/with-config.test.js

@@ -24,6 +24,11 @@ test('/', async t => {
   t.true(html.includes('<h1>I have custom configurations</h1>'))
 })
 
+test('/ (global styles inlined)', async t => {
+  const { html } = await nuxt.renderRoute('/')
+  t.true(html.includes('.global-css-selector'))
+})
+
 test('/ (custom app.html)', async t => {
   const { html } = await nuxt.renderRoute('/')
   t.true(html.includes('<p>Made by Nuxt.js team</p>'))