我正在尝试在演示中添加观察程序。我可以在类似的对象中添加手表
$scope.$watch('username',function(newvalue,oldvalue){
console.log(newvalue +":"+oldvalue);
$scope.newmessage=newvalue.toUpperCase();
})
它工作得很好。但当我尝试测试时,它给了我错误。这是我的代码
describe('value check', function() {
var $scope,
ctrl,
fac,
$httpBackend;
beforeEach(function() {
module('app');
});
afterEach(function() {
$httpBackend.verifyNoOutstandingExpectation();
$httpBackend.verifyNoOutstandingRequest();
});
beforeEach(inject(function($rootScope, $controller, _$httpBackend_) {
$scope = $rootScope.$new();
$httpBackend = _$httpBackend_;
createController = function() {
return $controller('cntrl', {
'$scope': $scope
});
};
}));
describe('watch check', function() {
beforeEach(function() {
$scope.$digest();
});
it('should init', function(){
expect($scope.newmessage).toBeUndefined();
});
it('should upper case',function() {
var controller = createController();
$scope.message='naveen';
$scope.$digest();
expect($scope.newmessage).toEqual('NAVEEN');
});
});
it("tracks that the spy was called", function() {
var response = [{
"name": "naveen"
}, {
"name": "parveen"
}]
$httpBackend.whenGET('data.json').respond(response);
var controller = createController();
$httpBackend.expectGET('data.json').respond(response);
$scope.getData();
$httpBackend.flush();
expect($scope.data[0].name).toEqual('naveen')
});
});
Plunker
http://plnkr.co/edit/NhazRDVM01DCDQWw8yzV?p=preview
第一个错误是意外请求,可以通过在should uppercase
测试用例中模拟data.json请求来解决。
第二个错误可以通过执行$scope.username = 'naveen'
而不是$scope.message = 'naveen'
来修复,因为您实际上是在关注用户名的更改,而不是消息的更改。
第三个错误是,当您初始化手表时,它被未定义的新值触发。要解决此问题,请检查控制器中是否未定义:
if (newvalue) {
$scope.newmessage = newvalue.toUpperCase();
}
参见plunker:http://plnkr.co/edit/OBUcoNGPdfRwy3hwR4KZ?p=preview