feat(Search): add action-text prop (#4501)

src/search/test/__snapshots__/index.spec.js.snap

@@ -1,5 +1,22 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`action-text prop 1`] = `
+<div class="van-search van-search--show-action" style="background: rgb(255, 255, 255);">
+  <div class="van-search__content van-search__content--square">
+    <div class="van-cell van-cell--borderless van-field">
+      <div class="van-field__left-icon"><i class="van-icon van-icon-search">
+          <!----></i></div>
+      <div class="van-cell__value van-cell__value--alone">
+        <div class="van-field__body"><input type="search" class="van-field__control"></div>
+      </div>
+    </div>
+  </div>
+  <div class="van-search__action">
+    <div>Custom Text</div>
+  </div>
+</div>
+`;
+
 exports[`label slot 1`] = `
 <div class="van-search" style="background: rgb(255, 255, 255);">
   <div class="van-search__content van-search__content--square">

src/search/test/index.spec.js

@@ -104,3 +104,14 @@ test('right-icon slot', () => {
 
   expect(wrapper).toMatchSnapshot();
 });
+
+test('action-text prop', () => {
+  const wrapper = mount(Search, {
+    propsData: {
+      actionText: 'Custom Text',
+      showAction: true
+    }
+  });
+
+  expect(wrapper).toMatchSnapshot();
+});