[new feature] Cell: add label slot (#2956)

packages/cell/test/__snapshots__/index.spec.js.snap

@@ -0,0 +1,13 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`arrow direction 1`] = `
+<div class="van-cell van-cell--clickable"><i class="van-icon van-icon-arrow-down van-cell__right-icon">
+    <!----></i></div>
+`;
+
+exports[`render slot 1`] = `
+<div class="van-cell">
+  <div class="van-cell__title">Custom Title<div class="van-cell__label">Custom Label</div>
+  </div>Custom Extra
+</div>
+`;

packages/cell/test/index.spec.js

@@ -14,3 +14,31 @@ test('click event', () => {
   wrapper.trigger('click');
   expect(click.mock.calls.length).toBeTruthy();
 });
+
+test('arrow direction', () => {
+  const wrapper = mount(Cell, {
+    propsData: {
+      isLink: true,
+      arrowDirection: 'down'
+    }
+  });
+
+  expect(wrapper).toMatchSnapshot();
+});
+
+test('render slot', () => {
+  const wrapper = mount({
+    template: `
+      <cell>
+        <template v-slot:title>Custom Title</template>
+        <template v-slot:label>Custom Label</template>
+        <template v-slot:extra>Custom Extra</template>
+      </cell>
+    `,
+    components: {
+      Cell
+    }
+  });
+
+  expect(wrapper).toMatchSnapshot();
+});