fix checkbox test

test/unit/specs/directives/model_spec.js

@@ -158,15 +158,13 @@ if (_.inBrowser) {
       el.firstChild.click()
       expect(vm.test).toBe('aFalseValue')
       expect(el.firstChild.checked).toBe(false)
-      vm.test = 'aTrueValue'
       _.nextTick(function () {
-        // the updated value of 'test' is not being passed
-        // into the 'update' method of v-model in this environment
-        // works fine in manual test
-        // expect(el.firstChild.checked).toBe(true)
-        done()
+        vm.test = 'aTrueValue'
+        _.nextTick(function () {
+          expect(el.firstChild.checked).toBe(true)
+          done()
+        })
       })
-
     })
 
     it('select', function (done) {