Javascript 如何测试&x27；私人'；与业力和茉莉花一起在角度服务中发挥作用

我的angular应用程序中有一项服务，看起来像这样：

angular.module('BracketService', []).factory('BracketService', [function() {
    function compareByWeight(a, b) {
        return a.weight - b.weight;
    }
    function filterWeightGroup(competitors, lowWeight, highWeight) {
        //filter stuff
    }
    function createBracketsByWeightGroup(weightGroup) {
        //create some brackets
    }
    //set some base line values
    var SUPER_HEAVY_WEIGHT = 500;
    var SUPER_LIGHT_WEIGHT = 20;
    return {
        //create brackets from a list of competitors
        returnBrackets: function(competitors) {
            var brackets = {};
            //get super light weights
            brackets.superLightWeights = createBracketsByWeightGroup(
                filterWeightGroup(competitors, 0, SUPER_LIGHT_WEIGHT)
                .sort(compareByWeight)
            );
            brackets.superHeavyWeights = createBracketsByWeightGroup(
                filterWeightGroup(competitors, SUPER_HEAVY_WEIGHT, Infinity)
                .sort(compareByWeight)
            );
            brackets.middleWeights = createBracketsByWeightGroup(
                filterWeightGroup(competitors, SUPER_LIGHT_WEIGHT, SUPER_HEAVY_WEIGHT)
                .sort(compareByWeight)
            );
            return brackets;
        }
    };

}]);

describe('BracketService', function() {
    beforeEach(module('bracketManager'));

    it('calling return brackets with no competitors will return 3 empty weight classes', inject(function(BracketService) {
        var mockCompetitors = [];
        var mockBracketResult = {superHeavyWeights: [[]], superLightWeights: [[]], middleWeights: [[]]};
        expect(BracketService.returnBrackets(mockCompetitors)).toEqual(mockBracketResult);
    }));
});

我不仅想对return语句中公开的函数/属性进行单元测试，还想对return语句之外的函数进行单元测试

我的测试当前设置如下：

angular.module('BracketService', []).factory('BracketService', [function() {
    function compareByWeight(a, b) {
        return a.weight - b.weight;
    }
    function filterWeightGroup(competitors, lowWeight, highWeight) {
        //filter stuff
    }
    function createBracketsByWeightGroup(weightGroup) {
        //create some brackets
    }
    //set some base line values
    var SUPER_HEAVY_WEIGHT = 500;
    var SUPER_LIGHT_WEIGHT = 20;
    return {
        //create brackets from a list of competitors
        returnBrackets: function(competitors) {
            var brackets = {};
            //get super light weights
            brackets.superLightWeights = createBracketsByWeightGroup(
                filterWeightGroup(competitors, 0, SUPER_LIGHT_WEIGHT)
                .sort(compareByWeight)
            );
            brackets.superHeavyWeights = createBracketsByWeightGroup(
                filterWeightGroup(competitors, SUPER_HEAVY_WEIGHT, Infinity)
                .sort(compareByWeight)
            );
            brackets.middleWeights = createBracketsByWeightGroup(
                filterWeightGroup(competitors, SUPER_LIGHT_WEIGHT, SUPER_HEAVY_WEIGHT)
                .sort(compareByWeight)
            );
            return brackets;
        }
    };

}]);

describe('BracketService', function() {
    beforeEach(module('bracketManager'));

    it('calling return brackets with no competitors will return 3 empty weight classes', inject(function(BracketService) {
        var mockCompetitors = [];
        var mockBracketResult = {superHeavyWeights: [[]], superLightWeights: [[]], middleWeights: [[]]};
        expect(BracketService.returnBrackets(mockCompetitors)).toEqual(mockBracketResult);
    }));
});

但是，如何测试返回语句未公开的compare、filter和create括号函数呢

---

谢谢

没有办法测试这些功能。它们的范围是组成您的BracketService工厂的功能，它们在任何其他地方都是不可见的。如果你想测试它们，那么你必须以某种方式暴露它们

您可以将它们移动到它们自己的服务中（这似乎有些过分），也可以使用足够的数据组合对BracketService服务进行黑盒测试，以确保内部功能正常工作。这可能是最明智的方法

如果您不想将它们放在一个单独的服务中，但仍然觉得需要测试这些内部功能，只需将它们与return括号一起从工厂返回即可

当我有许多助手函数可以直接进行单独测试时，我可能会这样做，但会打开一个组合的潘多拉盒子到黑盒子测试。我通常在这些函数的前面加上一个“\ux”来表示它们是辅助函数，并且仅用于测试

return {
    //create brackets from a list of competitors
    returnBrackets: function(competitors) {...},
    _filterWeightGroup: filterWeightGroup,
    _createBracketsByWeightGroup: createBracketsByWeightGroup
   };

---

如果不以某种方式公开这些函数，您将无法调用它们。但是，IMHO，私有方法不应该有单元测试，而应该在测试调用它们的公共方法时进行测试。您应该做的是模拟您的私有函数将接收的对象，并且您将能够对它们执行预期操作。

在当前设置中测试它们的唯一方法是测试返回的函数，因为它们当前位于

BracketService

内的作用域中。如果希望它们可以单独测试，则需要在return语句中将它们作为

BracketService

的属性公开