根据Michal Charemza的帖子编辑。
我有一个代表angularui模态对话框的服务:
app.factory("dialogFactory", function($modal, $window, $q) {
function confirmDeleteDialog() {
var modalInstance = $modal.open({
templateUrl: "../application/factories/confirmDeleteDialog.htm",
controller: function($scope, $modalInstance) {
$scope.ok = function() {
$modalInstance.close("true");
};
$scope.cancel = function() {
$modalInstance.dismiss("false");
};
}
});
return modalInstance.result.then(function(response) {
return 'My other success result';
}, function(response) {
return $q.reject('My other failure reason');
});
};
return {
confirmDeleteDialog: confirmDeleteDialog
};
});
如果用户已从对话框requestNotificationChannel.deleteMessage(id)
中单击确定,则调用delete方法。
$scope.deleteMessage = function(id) {
var result = dialogFactory.confirmDeleteDialog();
result.then(function(response) {
requestNotificationChannel.deleteMessage(id);
});
};
问题是我无法对此进行单元测试。
这是我的考试。我已经正确地注入了q服务,但我不确定应该从"confirmDeleteDialog"
spy ...
describe("has a delete method that should call delete message notification", function() {
var deferred = $q.defer();
spyOn(dialogFactory, "confirmDeleteDialog").and.returnValue(deferred.promise);
spyOn(requestNotificationChannel, "deleteMessage");
$scope.deleteMessage(5);
deferred.resolve();
it("delete message notification is called", function() {
expect(requestNotificationChannel.deleteMessage).toHaveBeenCalled();
});
});
但我收到了expected spy deleteMessage to have been called
。这意味着result.then
...部分未执行。我错过了什么?
答案 0 :(得分:40)
要模拟一个返回promise的函数,它还需要返回一个promise,然后需要将其解析为一个单独的步骤。
在您的情况下,传递给间谍的deferred.resolve()
需要替换为deferred.promise
,而deferred.resolve()需要单独执行。
beforeEach(function() {
var deferred = $q.defer();
spyOn(dialogFactory, "confirmDeleteDialog").and.returnValue(deferred.promise);
spyOn(requestNotificationChannel, "deleteMessage");
$scope.deleteMessage(5);
deferred.resolve();
$rootScope.$digest();
});
it("delete message notification is called", function() {
expect(requestNotificationChannel.deleteMessage).toHaveBeenCalled();
});
我怀疑您还需要致电$rootScope.$digest()
,因为Angular的承诺实施与摘要循环相关联。
此外,与您的问题略有不同,但我认为您不需要在confirmDeleteDialog
中创建自己的延迟对象。您使用的(反)模式已标记为“遗忘承诺”,如http://taoofcode.net/promise-anti-patterns/
什么时候更简单,使用更少的代码,我认为这样可以更好地处理错误,您只需返回$modal
服务创建的承诺:
var modalInstance = $modal.open({...});
return modalInstance.result;
如果要根据已解析/拒绝的值修改调用函数所看到的内容,可以通过返回then
的结果来创建链式承诺:
var modalInstance = $modal.open({...});
return modalInstance.result.then(function(successResult) {
return 'My other success result';
}, function(failureReason) {
return $q.reject('My other failure reason');
});
如果您不想将函数的内部工作暴露给其调用者,通常会这样做。这类似于在同步编程中重新抛出异常的概念。