Fix uploader test and refactor makeTestWrapper to accept data fn

js/test_utils/component_test_helpers.js

@@ -16,7 +16,7 @@ to be passed as a prop to checkboxinput at mount time
     v-bind:initial-checked='initialvalue'
     >
 */
-const makeTestWrapper = ({ components, templatePath }) => {
+const makeTestWrapper = ({ components, templatePath, data }) => {
   const templateString = fs.readFileSync(
     `js/test_templates/${templatePath}`,
     'utf-8'
@@ -27,11 +27,7 @@ const makeTestWrapper = ({ components, templatePath }) => {
     components,
     template: templateString,
     props: ['initialData'],
-    data: function() {
-      return {
-        initialvalue: this.initialData,
-      }
-    },
+    data,
   }
 
   return WrapperComponent