angularjs - 单元测试，当 $http 没有被调用时等待 promise

Question

我有一个单元测试，其中服务返回一个 promise 。有时该服务可能会发出 $http 请求，有时不会(它实现了某种缓存)。无论哪种情况，它都会解决 promise ，但只有在 $httpBackend.flush() 中它才真正开始进行回调。我怎样才能使已解析的 promise 像flush()那样实际调用.then()中的函数。

这个效果很好

resolved = jasmine.createSpy();
rejected = jasmine.createSpy();
employeeEventService.loadSchedules()
    .then(resolved, rejected);

$httpBackend.flush();  // This causes the promise to resolve/reject

expect(resolved).toHaveBeenCalled();
expect(rejected).not.toHaveBeenCalled();

这个不起作用，因为我无法调用flush()(因为该服务从未调用过$http)

resolved = jasmine.createSpy();
rejected = jasmine.createSpy();
employeeEventService.loadSchedules()
    .then(resolved, rejected);

//$httpBackend.flush();  // Can't call this because this call is "cached"

expect(resolved).toHaveBeenCalled();
expect(rejected).not.toHaveBeenCalled();

---

服务代码:

if(loaded.startOn <= params.startOn && loaded.endOn >= params.endOn
   && new Date() - lastFetch < 60000) {
     deferred.resolve(loaded.schedules);
} else {
    service.loading +=1;
    config = {params: params, timeout:30*1000};
    $http.get('/api/employee-schedules/', config)
        .then(function(response) {
            ...
            process the json response
            ...
            deferred.resolve(loaded.schedules);
         }, function(reason, status) {
            $log.error("Failed to get schedules", reason, status);
            deferred.reject(reason, status);
         })
         .finally(function() {
              service.loading -=1;
         });
}
return deferred.promise;

Answer 1

所有的 promise ，无论它们采用什么模式，都会在您调用 $scope.$digest(); 时得到解析