first commit

vant/test/demo.ts

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+import Vue, { CreateElement } from 'vue';
+import '../docs/site/mobile';
+import Locale from '../src/locale';
+import { mount, later } from '.';
+
+const Empty = {
+  render(h: CreateElement): ReturnType<CreateElement> {
+    return h('div', [(this as any).$slots.default]);
+  },
+  inheritAttrs: false,
+};
+
+Vue.component('demo-block', Empty);
+Vue.component('demo-section', Empty);
+
+export function snapshotDemo(Demo: any, option: any = {}) {
+  test('renders demo correctly', async () => {
+    if (option.beforeTest) {
+      option.beforeTest();
+    }
+
+    if (Demo.i18n) {
+      Locale.add(Demo.i18n);
+    }
+
+    const wrapper = mount(Demo);
+
+    await later();
+
+    expect(wrapper).toMatchSnapshot();
+
+    if (option.afterTest) {
+      option.afterTest();
+    }
+  });
+}