[bugfix] Tab: can swipe to disabled tab (#2064)

packages/tab/test/index.spec.js

@@ -0,0 +1,63 @@
+import Tab from '..';
+import Tabs from '../../tabs';
+import { mount, later, triggerDrag } from '../../../test/utils';
+
+function createWrapper(options) {
+  return mount({
+    template: `
+      <tabs @change="onChange" swipeable>
+        <tab title="title1">Text</tab>
+        <tab title="title2">Text</tab>
+        <tab title="title3" disabled>Text</tab>
+      </tabs>
+    `,
+    components: {
+      Tab,
+      Tabs
+    },
+    ...options
+  });
+}
+
+test('click to switch tab', async() => {
+  const onChange = jest.fn();
+  const wrapper = createWrapper({
+    methods: {
+      onChange
+    }
+  });
+
+  await later();
+  expect(wrapper).toMatchSnapshot();
+
+  const tabs = wrapper.findAll('.van-tab');
+  tabs.at(1).trigger('click');
+  tabs.at(2).trigger('click');
+  await later();
+  expect(wrapper).toMatchSnapshot();
+  expect(onChange.mock.calls.length).toEqual(1);
+});
+
+test('swipe to switch tab', async() => {
+  const onChange = jest.fn();
+  const wrapper = createWrapper({
+    methods: {
+      onChange
+    }
+  });
+
+  const content = wrapper.find('.van-tabs__content');
+  await later();
+  expect(wrapper).toMatchSnapshot();
+  triggerDrag(content, -100, 0);
+  expect(wrapper).toMatchSnapshot();
+  expect(onChange.mock.calls.length).toEqual(1);
+  triggerDrag(content, -100, 0);
+  expect(wrapper).toMatchSnapshot();
+  triggerDrag(content, 100, 0);
+  triggerDrag(content, 100, 0);
+  expect(wrapper).toMatchSnapshot();
+
+  await later();
+  wrapper.destroy();
+});