[Improvement] Optimize demo test (#1053)

packages/sku/test/__snapshots__/demo.spec.js.snap

@@ -1,3 +1,3 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`renders sku correctly 1`] = `""`;
+exports[`renders demo correctly 1`] = `""`;

packages/sku/test/demo.spec.js

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