chore: split function call (#8424)

src/image-preview/test/function-call.spec.ts

@@ -0,0 +1,13 @@
+import { createApp } from 'vue';
+import { ImagePreview } from '../function-call';
+import ImagePreviewComponent from '../ImagePreview';
+
+test('should expose ImagePreviewComponent in ImagePreview.Component', () => {
+  expect(ImagePreview.Component.name).toEqual('van-image-preview');
+});
+
+test('should register component to app', () => {
+  const app = createApp(document.body);
+  app.use(ImagePreview);
+  expect(app.component(ImagePreviewComponent.name)).toBeTruthy();
+});