chore: adjust path of test utils (#4997)

src/tab/test/demo.spec.js

@@ -1,4 +1,4 @@
 import Demo from '../demo';
-import demoTest from '../../../test/demo-test';
+import { snapshotDemo } from '../../../test/demo';
 
-demoTest(Demo);
+snapshotDemo(Demo);

src/tab/test/index.spec.js

@@ -1,7 +1,7 @@
 import Vue from 'vue';
 import Tab from '..';
 import Tabs from '../../tabs';
-import { mount, later, triggerDrag } from '../../../test/utils';
+import { mount, later, triggerDrag } from '../../../test';
 
 Vue.use(Tab);
 Vue.use(Tabs);