infiniteScroll: add infiniteScroll component (#15567)

test/unit/specs/infiniteScroll.spec.js

@@ -0,0 +1,32 @@
+import { createVue, wait, destroyVM } from '../util';
+
+describe('InfiniteScroll', () => {
+  let vm;
+  afterEach(() => {
+    destroyVM(vm);
+  });
+
+  it('create', async() => {
+    vm = createVue({
+      template: `
+      <ul ref="scrollTarget" v-infinite-scroll="load" style="height: 300px;overflow: auto;">
+        <li v-for="i in count" style="display: flex;height: 50px;">{{ i }}</li>
+      </ul>
+      `,
+      data() {
+        return {
+          count: 0
+        };
+      },
+      methods: {
+        load() {
+          this.count += 2;
+        }
+      }
+    }, true);
+    vm.$refs.scrollTarget.scrollTop = 2000;
+    await wait();
+    expect(vm.$el.innerText.indexOf('2') > -1).to.be.true;
+  });
+});
+