Return promisse in plugin to use in tests e2e

Author: ktquez

Diff for: src/index.js

@@ -18,7 +18,5 @@ export default function install (Vue, options) {
     }
   })
 
-  Vue.nextTick(() => {
-    return checkAndReport(document)
-  })
+  return Vue.nextTick().then(() => checkAndReport(document))
 }

Diff for: src/utils.js

@@ -40,6 +40,7 @@ export function checkAndReport (node) {
     }
     deferred.resolve()
   })
+  return deferred.promise
 }
 
 function createDeferred () {