test: fix broken date-picker default-value test

test/unit/specs/date-picker.spec.js

@@ -319,23 +319,11 @@ describe('DatePicker', () => {
   });
 
   it('default value', done => {
-    const toDateStr = date => {
-      let d = new Date(date);
-      return `${d.getFullYear()}-${d.getMonth()}-${d.getDate()}`;
-    };
-    let today = new Date();
-    let nextMonth = new Date(today);
-    nextMonth.setDate(1);
-    if (nextMonth.getMonth() === 12) {
-      nextMonth.setFullYear(today.getFullYear + 1);
-      nextMonth.setMonth(1);
-    } else {
-      nextMonth.setMonth(today.getMonth() + 1);
-    }
-    let nextMonthStr = toDateStr(nextMonth);
+    let defaultValue = '2000-01-01';
+    let expectValue = new Date(2000, 0, 1);
 
     vm = createVue({
-      template: `<el-date-picker v-model="value" ref="compo" default-value="${nextMonthStr}" />`,
+      template: `<el-date-picker v-model="value" ref="compo" default-value="${defaultValue}" />`,
       data() {
         return {
           value: ''
@@ -350,10 +338,10 @@ describe('DatePicker', () => {
       const $el = vm.$refs.compo.picker.$el;
       $el.querySelector('td.current').click();
       setTimeout(_ => {
-        expect(vm.value).to.equal(nextMonthStr);
-      });
-      done();
-    });
+        expect(+vm.value).to.equal(+expectValue);
+        done();
+      }, 10);
+    }, 10);
   });
 
   describe('keydown', () => {