message: test v-model select with circular reference
diff: @@ -445,4 +445,30 @@ describe('Directive v-model select', () => {
  done()
  }, 0)
  })
  +
  + it('should work with option value that has circular reference', done => {
  + const circular = {}
  + circular.self = circular
  +
  + const vm = new Vue({
  + data: {
  + test: 'b',
  + circular
  + },
  + template:
  + '<select v-model="test">' +
  + '<option :value="circular">a</option>' +
  + '<option>b</option>' +
  + '<option>c</option>' +
  + '</select>'
  + }).$mount()
  + document.body.appendChild(vm.$el)
  + expect(vm.test).toBe('b')
  + expect(vm.$el.value).toBe('b')
  + expect(vm.$el.childNodes[1].selected).toBe(true)
  + vm.test = circular
  + waitForUpdate(function () {
  + expect(vm.$el.childNodes[0].selected).toBe(true)
  + }).then(done)
  + })
  })
  