茉莉花中没有解决的角承诺 [英] Angular promise not resolving in jasmine

问题描述

我有以下茉莉花测试:

it('should resolve promise', inject(function ($q, $rootScope) {

    function getPromise(){
        var deferred = $q.defer();
        setTimeout(function(){
            deferred.resolve(true);
        }, 1000);
        return deferred.promise;
    }

    var p = getPromise();
    var cb = jasmine.createSpy();

    runs(function(){
        expect(cb).not.toHaveBeenCalled();

        p.then(cb);

        $rootScope.$apply();
    });

    waitsFor(function(){
        return cb.callCount == 1;
    });

    runs(function(){
        expect(cb).toHaveBeenCalled();

        $rootScope.$apply();
    });

}));

我认为 $rootScope.$apply 应该解决所有未完成的承诺，但不知何故，它在这个测试中没有发生.

I thought $rootScope.$apply was supposed to resolve all outstanding promises, but somehow it does not happen in this test.

如何在这样的测试中触发 Promise 解析?请帮忙！

How do i trigger promise resolving in a test like this? please help!

推荐答案

我认为 $rootScope.$apply() 在你的情况下被调用得太早了.这应该有效:

I think the $rootScope.$apply() is being called too soon in your case. This should work:

function getPromise(){
    var deferred = $q.defer();
    setTimeout(function(){
        deferred.resolve(true);
        $rootScope.$apply();
    }, 1000);
    return deferred.promise;
}

更新

您可以注入 模拟 $timeout 服务 并解决其中的承诺显式使用 $timeout.flush().

it('should resolve promise', inject(function ($q, $timeout, $rootScope) {

    function getPromise(){
        var deferred = $q.defer();
        $timeout(function(){
            deferred.resolve(true);
        }, 1000); 
        return deferred.promise;
    }

    // ...

    $timeout.flush();

    // ...

这篇关于茉莉花中没有解决的角承诺的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！