docs: update rate demo

Author: tangjinzhou

components/rate/__tests__/__snapshots__/demo.test.js.snap

@@ -229,8 +229,7 @@ exports[`renders ./components/rate/demo/clear.md correctly 1`] = `
             </svg></i></div>
       </div>
     </li>
-  </ul> allowClear: true
-  <br>
+  </ul> <span class="ant-rate-text">allowClear: true</span> <br>
   <ul tabindex="0" role="radiogroup" class="ant-rate">
     <li class="ant-rate-star ant-rate-star-full">
       <div role="radio" aria-checked="true" aria-posinset="1" aria-setsize="5" tabindex="0">
@@ -282,8 +281,7 @@ exports[`renders ./components/rate/demo/clear.md correctly 1`] = `
             </svg></i></div>
       </div>
     </li>
-  </ul> allowClear: false
-  <br>
+  </ul> <span class="ant-rate-text">allowClear: false</span>
 </div>
 `;
 

components/rate/__tests__/index.test.js

@@ -1,6 +1,8 @@
 import Rate from '..';
 import focusTest from '../../../tests/shared/focusTest';
+import mountTest from '../../../tests/shared/mountTest';
 
 describe('Rate', () => {
   focusTest(Rate);
+  mountTest(Rate);
 });

components/rate/demo/clear.md

@@ -11,10 +11,11 @@ Support set allow to clear star when click again.
 ```tpl
 <template>
   <div>
-    <a-rate :defaultValue="3" /> allowClear: true
-    <br />
-    <a-rate :allowClear="false" :defaultValue="3" /> allowClear: false
+    <a-rate :defaultValue="3" />
+    <span class="ant-rate-text">allowClear: true</span>
     <br />
+    <a-rate :allowClear="false" :defaultValue="3" />
+    <span class="ant-rate-text">allowClear: false</span>
   </div>
 </template>
 ```

components/rate/index.jsx

@@ -31,17 +31,17 @@ const Rate = {
     configProvider: { default: () => ConfigConsumerProps },
   },
   methods: {
+    characterRender(node, { index }) {
+      const { tooltips } = this.$props;
+      if (!tooltips) return node;
+      return <Tooltip title={tooltips[index]}>{node}</Tooltip>;
+    },
     focus() {
       this.$refs.refRate.focus();
     },
     blur() {
       this.$refs.refRate.blur();
     },
-    characterRender(node, { index }) {
-      const { tooltips } = this.$props;
-      if (!tooltips) return node;
-      return <Tooltip title={tooltips[index]}>{node}</Tooltip>;
-    },
   },
   render() {
     const { prefixCls: customizePrefixCls, ...restProps } = getOptionProps(this);