feat(Tabs): add click-tab event (#9037)

src/tab/test/index.spec.tsx

@@ -0,0 +1,50 @@
+import { mount, later } from '../../../test';
+import { Tab } from '..';
+import { Tabs } from '../../tabs';
+
+test('should emit click event when tab is clicked', async () => {
+  const onClick = jest.fn();
+
+  const wrapper = mount({
+    render() {
+      return (
+        <Tabs onClick={onClick}>
+          <Tab title="title1">1</Tab>
+          <Tab title="title2">2</Tab>
+        </Tabs>
+      );
+    },
+  });
+
+  await later();
+  const tabs = wrapper.findAll('.van-tab');
+
+  await tabs[0].trigger('click');
+  expect(onClick).toHaveBeenCalledWith(0, 'title1');
+});
+
+test('should emit click-tab event when tab is clicked', async () => {
+  const onClickTab = jest.fn();
+
+  const wrapper = mount({
+    render() {
+      return (
+        <Tabs onClick-tab={onClickTab}>
+          <Tab title="title1">1</Tab>
+          <Tab title="title2">2</Tab>
+        </Tabs>
+      );
+    },
+  });
+
+  await later();
+  const tabs = wrapper.findAll('.van-tab');
+
+  await tabs[0].trigger('click');
+  expect(onClickTab).toHaveBeenCalledWith(
+    expect.objectContaining({
+      name: 0,
+      title: 'title1',
+    })
+  );
+});