C#为对象列表创建Mock Configuration.GetSection“ Section:SubSection”

问题描述

客观

使用Moq和XUnit创建一个模拟对象,以加载特定的“字符/技能”部分以增强单元测试的覆盖范围。

SUT(在某些情况下)以某种方式加载设置

var skills = Configuration.GetSection(“Character:Skills”);

通过以下appSetting:

{
    "dummyConfig1": {
        "Description": "bla bla bla...",},"Character": {
    "Name": "John Wick","Description": "A retired hitman seeking vengeance for the killing of the dog given to him...","Skills": [
        {
        "Key": "CQC Combat","Id": "15465"
        },{
        "Key": "Firearms","Id": "14321"
        },{
        "Key": "Stealth","Id": "09674"
        },{
        "Key": "Speed","Id": "10203"
        }
    ],"DummyConf2": "more bla bla bla..."
}

以前的阅读

在阅读这些文章(以及其他由于Googling导致的结果)时,我注意到我们只能使用原始的“字符串”数据类型,或者使用 new Mock 对象(无设置) :

约束::将appSetting文件复制到TestProject(或创建MemoryStream)以加载实际设置可以解决这种情况,但是测试将是“集成”而不是“单元”;因为存在I / O依赖性。

方法

代码的想法(如下所示)是模拟每个属性(键/ id),然后将它们合并到类似于以下的树中:

  • “字符” ------要读取的配置,先使用GetSection(),然后使用Get<T>()
    • “技能” ------具有合并属性的配置列表
      • “键”-“ CQC战斗” ------原始值1
      • “ Id”-“ 15465” ------原始值2

代码

var skillsConfiguration = new List<SkillsConfig>
{
    new SkillsConfig { Key = "CQC Combat",Id = "15465" },new SkillsConfig { Key = "Firearms",Id = "14321" },new SkillsConfig { Key = "Stealh",Id = "09674" },new SkillsConfig { Key = "Speed",Id = "10203" },};

var configurationMock = new Mock<IConfiguration>();
var mockConfSections = new List<IConfigurationSection>();

foreach (var skill in skillsConfiguration)
{
    var index = skillsConfiguration.IndexOf(skill);

    //Set the Key string value
    var mockConfSectionKey = new Mock<IConfigurationSection>();
    mockConfSectionKey.Setup(s => s.Path).Returns($"Character:Skills:{index}:Key");
    mockConfSectionKey.Setup(s => s.Key).Returns("Key");
    mockConfSectionKey.Setup(s => s.Value).Returns(skill.Key);

    //Set the Id string value
    var mockConfSectionId = new Mock<IConfigurationSection>();
    mockConfSectionId.Setup(s => s.Path).Returns($"Character:Skills:{index}:Id");
    mockConfSectionId.Setup(s => s.Key).Returns("Id");
    mockConfSectionId.Setup(s => s.Value).Returns(skill.Id);

    //Merge the attribute "key/id" as Configuration section list
    var mockConfSection = new Mock<IConfigurationSection>();                
    mockConfSection.Setup(s => s.Path).Returns($"Character:Skills:{index}");
    mockConfSection.Setup(s => s.Key).Returns(index.ToString());
    mockConfSection.Setup(s => s.GetChildren()).Returns(new List<IConfigurationSection> { mockConfSectionKey.Object,mockConfSectionId.Object });    
    
    //Add the skill object with merged attributes
    mockConfSections.Add(mockConfSection.Object);
}

// Add the Skill's list
var skillsMockSections = new Mock<IConfigurationSection>();
skillsMockSections.Setup(cfg => cfg.Path).Returns("Character:Skills");
skillsMockSections.Setup(cfg => cfg.Key).Returns("Skills");
skillsMockSections.Setup(cfg => cfg.GetChildren()).Returns(mockConfSections);

//Mock the whole section,for using GetSection() method withing SUT
configurationMock.Setup(cfg => cfg.GetSection("Character:Skills")).Returns(skillsMockSections.Object);

预期结果

运行原始系统,我得到了带有其各自实例的实例化列表 这是屏幕截图:

appsetting loaded sucessfully

模拟结果

上面的代码,我只得到实例化列表,但是所有属性都返回null。 这是屏幕截图:

appsetting mocked with null values

解决方法

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