visual-studio-2008 - Visual Studio 2008 - 使用 Web 配置设置进行单元测试

Question

我的 Web 应用程序依赖于 web.config 条目为特定值(例如 FEATURE_ACTIVATED=true)，那么如何测试读取此 web.config 条目的函数？

我希望避免将 web.config 条目复制到单元测试项目中的 app.config，因为同步文件需要付出额外的努力。

Answer 1

提取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(inject)。

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();
}