chore: adjust path of test utils (#4997)

src/picker/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/picker/test/index.spec.js

@@ -1,6 +1,6 @@
 import Picker from '..';
 import PickerColumn from '../PickerColumn';
-import { mount, triggerDrag, later } from '../../../test/utils';
+import { mount, triggerDrag, later } from '../../../test';
 
 const simpleColumn = ['1990', '1991', '1992', '1993', '1994', '1995'];
 const columns = [