[new feature] Field: add size prop (#2936)

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

@@ -44,3 +44,11 @@ exports[`render textarea 1`] = `
   </div>
 </div>
 `;
+
+exports[`size prop 1`] = `
+<div class="van-cell van-cell--large van-field">
+  <div class="van-cell__value van-cell__value--alone">
+    <div class="van-field__body"><input type="text" class="van-field__control"></div>
+  </div>
+</div>
+`;

packages/field/test/index.spec.js

@@ -187,3 +187,12 @@ test('render right icon with icon prop for old version', () => {
   });
   expect(wrapper).toMatchSnapshot();
 });
+
+test('size prop', () => {
+  const wrapper = mount(Field, {
+    propsData: {
+      size: 'large'
+    }
+  });
+  expect(wrapper).toMatchSnapshot();
+});