[bugfix] Tab: click event param missing (#3866)

src/tab/test/index.spec.js

@@ -146,6 +146,34 @@ test('border props', async () => {
   expect(wrapper).toMatchSnapshot();
 });
 
+
+test('click event', async () => {
+  const onClick = jest.fn();
+  const onDisabled = jest.fn();
+
+  const wrapper = mount({
+    template: `
+      <van-tabs @click="onClick" @disabled="onDisabled">
+        <van-tab title="title1">Text</van-tab>
+        <van-tab title="title2" disabled>Text</van-tab>
+      </van-tabs>
+    `,
+    methods: {
+      onClick,
+      onDisabled
+    }
+  });
+
+  const tabs = wrapper.findAll('.van-tab');
+
+  tabs.at(0).trigger('click');
+  expect(onClick).toHaveBeenCalledWith(0, 'title1');
+
+  tabs.at(1).trigger('click');
+  expect(onDisabled).toHaveBeenCalledWith(1, 'title2');
+});
+
+
 test('name prop', async () => {
   const onClick = jest.fn();
   const onChange = jest.fn();