test: webfontloader loading fn

Author: TheAlexLichter

test/fixture/configs/default.js

@@ -10,6 +10,9 @@ module.exports = {
   webfontloader: {
     google: {
       families: ['Lato:400,700']
+    },
+    loading: () => {
+      window._fontsAreLoading = true
     }
   },
   build: {

test/module.test.js

@@ -14,6 +14,8 @@ describe('nuxt-webfontloader', () => {
     const window = await nuxt.server.renderAndGetWindow(url('/'))
     await new Promise(resolve => setTimeout(resolve, 2500))
 
+    expect(window._fontsAreLoading).toBe(true)
+
     const htmlClasses = Array.from(window.document.documentElement.classList)
     expect(htmlClasses).toEqual(expect.arrayContaining(['wf-loading', 'wf-lato-n4-loading', 'wf-lato-n7-loading']))
   })