[fix] Stepper: not fire event on changing the value prop #545 (#546)

test/unit/specs/stepper.spec.js

@@ -79,13 +79,11 @@ describe('Stepper', () => {
     });
 
     expect(wrapper.hasClass('van-stepper')).to.be.true;
-    const eventStub = sinon.stub(wrapper.vm, '$emit');
 
     wrapper.vm.value = 2;
     wrapper.update();
     wrapper.vm.$nextTick(() => {
-      expect(eventStub.calledWith('input'));
-      expect(eventStub.calledWith('change'));
+      expect(wrapper.vm.currentValue).to.equal(2);
       done();
     });
   });
@@ -135,4 +133,20 @@ describe('Stepper', () => {
       done();
     });
   });
+
+  it('should not fire any event on props changed', (done) => {
+    wrapper = mount(Stepper, {
+      propsData: {
+        value: 1
+      }
+    });
+    const eventStub = sinon.stub(wrapper.vm, '$emit');
+
+    wrapper.vm.value = 2;
+    wrapper.update();
+    wrapper.vm.$nextTick(() => {
+      expect(eventStub.called).to.be.false;
+      done();
+    });
+  });
 });