Make sure that axios adapater is restored after mocking

app/assets/javascripts/lib/utils/axios_utils.js

@@ -22,3 +22,11 @@ axios.interceptors.response.use((config) => {
 });
 
 export default axios;
+
+/**
+ * @return The adapter that axios uses for dispatching requests. This may be overwritten in tests.
+ *
+ * @see https://github.com/axios/axios/tree/master/lib/adapters
+ * @see https://github.com/ctimmerm/axios-mock-adapter/blob/v1.12.0/src/index.js#L39
+ */
+export const getDefaultAdapter = () => axios.defaults.adapter;

spec/javascripts/test_bundle.js

@@ -6,6 +6,8 @@ import '~/commons';
 import Vue from 'vue';
 import VueResource from 'vue-resource';
 
+import { getDefaultAdapter } from '~/lib/utils/axios_utils';
+
 const isHeadlessChrome = /\bHeadlessChrome\//.test(navigator.userAgent);
 Vue.config.devtools = !isHeadlessChrome;
 Vue.config.productionTip = false;
@@ -59,6 +61,8 @@ beforeEach(() => {
   Vue.http.interceptors = builtinVueHttpInterceptors.slice();
 });
 
+const axiosDefaultAdapter = getDefaultAdapter();
+
 // render all of our tests
 const testsContext = require.context('.', true, /_spec$/);
 testsContext.keys().forEach(function (path) {
@@ -94,6 +98,12 @@ describe('test errors', () => {
   it('has no Vue error', () => {
     expect(hasVueErrors).toBe(false);
   });
+
+  it('restores axios adapter after mocking', () => {
+    if (getDefaultAdapter() !== axiosDefaultAdapter) {
+      fail('axios adapter is not restored! Did you forget a restore() on MockAdapter?');
+    }
+  });
 });
 
 // if we're generating coverage reports, make sure to include all files so