Radio: improve test case

Author: jikkai

test/unit/specs/radio.spec.js

@@ -1,4 +1,4 @@
-import { createVue, destroyVM } from '../util';
+import { createVue, destroyVM, triggerKeyDown } from '../util';
 
 describe('Radio', () => {
   let vm;
@@ -258,6 +258,46 @@ describe('Radio', () => {
         done();
       }, 10);
     });
+    it('keyboard event', done => {
+      vm = createVue({
+        template: `
+          <el-radio-group v-model="radio">
+            <el-radio-button ref="radio1" :label="3">备选项</el-radio-button>
+            <el-radio-button ref="radio2" :label="6">备选项</el-radio-button>
+            <el-radio-button ref="radio3" :label="9">备选项</el-radio-button>
+          </el-radio-group>
+        `,
+        data() {
+          return {
+            radio: 6
+          };
+        }
+      }, true);
+
+      expect(vm.radio).to.be.equal(6);
+      vm.$nextTick(() => {
+        triggerKeyDown(vm.$refs.radio2.$el, 37);
+        expect(vm.radio).to.be.equal(3);
+
+        triggerKeyDown(vm.$refs.radio1.$el, 37);
+        expect(vm.radio).to.be.equal(9);
+
+        vm.$nextTick(() => {
+          triggerKeyDown(vm.$refs.radio3.$el, 39);
+          expect(vm.radio).to.be.equal(3);
+
+          triggerKeyDown(vm.$refs.radio1.$el, 39);
+          expect(vm.radio).to.be.equal(6);
+
+          vm.$nextTick(() => {
+            triggerKeyDown(vm.$refs.radio1.$el, 13);
+            expect(vm.radio).to.be.equal(6);
+
+            done();
+          });
+        });
+      });
+    });
     describe('Radio Button', () => {
       it('create', done => {
         vm = createVue({