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Visual Studio 2008-使用Web配置设置进行单元测试

web-config unit-testing visual-studio-2008

Jeff Meatball Yang · 技术社区 · 16 年前

我的web应用程序依赖于web.config条目是一个特定的值(比如feature_activated=true),那么如何测试读取该web.config条目的函数呢?

我希望避免将web.config条目复制到单元测试项目中的app.config中,因为同步文件需要额外的工作。

3 回复 | 直到 16 年前

NerdFury 16 年前

拉出读取配置数据的代码,然后在测试中使用与模拟对象或模拟框架配对的依赖注入。

public interface IConfiguration
{
  bool IsAwesomeFeatureActivated { get; }
}

public class Configuration: IConfiguration
{
  public bool IsAwesomeFeatureActivated
  { 
    get { /* get config value */ }
  }
}

public class AwesomeFeature
{
  private IConfiguration _configuration;

  public AwesomeFeature(IConfiguration configuration)
  {
    _configuration = configuration;
  }

  public void ExecuteFeature()
  {
    if(! _configuration.IsAwesomeFeatureActivated) return;
    // do awesome feature functionality
  }
}

public class MockConfiguration: IConfiguration
{
  private bool _isAwesomeFeatureActivated;
  public void SetIsAwesomeFeatureEnabled(bool value)
  {
    _isAwesomeFeatureActivated = value;
  }

  public bool IsAwesomeFeatureActivated
  {
    get { return _isAwesomeFeatureActivated; }
  }
}

// with mock object
[Test]
public void ExecuteFeature_WhenNotActivated_DoNothing()
{
  var mockConfig = new MockConfiguration();
  mockConfig.SetIsAwesomeFeatureActivated(false);
  var feature = new AwesomeFeature(mockConfig);
  feature.ExecuteFeature();
  Assert.SomethingHere();
}

// or with Moq framework
[Test]
public void ExecuteFeature_WithActivated_DoSomething()
{
  var mock = new Mock<IConfiguration>();
  mock.Setup(c => c.IsAwesomeFeatureActivated).Returns(true);

  var feature = new AwesomeFeature(mock.Object);
  feature.ExecuteFeature();

  Assert.SomethingHere();
}

Oded 16 年前

我也喜欢尽可能避免使用这些代码,但有时没有其他的选择(特别是在处理遗留代码时)。

在可以的地方,创建一个用于访问配置选项的接口-将其插入正在访问配置的任何位置。

然后实现一个具体的类,将其委托给内置的配置类,这是要使用的默认实现。

为测试创建接口的模拟实现,并在测试时注入。

Page 16 年前

我总是包装配置逻辑,以便在系统测试时替换(模拟)配置。

换句话说,我的配置是这样包装的:

    public interface IConfigurationSettings
    {
        string SmtpHost { get; }
    }

    public class ConfigurationSettings : IConfigurationSettings
    {
        public string SmtpHost
        {
            get { return ConfigurationManager.AppSettings["SmtpHost"]; }
        }
    }

    public static class Settings
    {
        private static readonly IConfigurationSettings _configurationSettings;

        static Settings()
        {
            _configurationSettings = IoCHelper.Resolve<IConfigurationSettings>();
        }

        public static string SmtpHost
        {
            get { return _configurationSettings.SmtpHost; }
        }
}

然后,当系统处于测试状态时,我可以这样模拟我的配置:

var settings = new Mock<IConfigurationSettings>();
settings.SetupGet(s => s.SmtpHost).Returns("127.0.0.1");
Resolver.Setup(r => r.Resolve<IConfigurationSettings>()).Returns(settings.Object);