测试项目和配置文件

 public interface IMyConfig
 {
      string MyProperty { get; }
      int MyIntProperty { get; }
 }

 public class MyConfig : IMyConfig
 {
      public string MyProperty
      {
         get { ...lazy load from the actual config... }
      }

      public int MyIntProperty
      {
         get { ... }
      }
  }

 public class MyLibClass
 {
      private IMyConfig config;

      public MyLibClass() : this(null) {}

      public MyLibClass( IMyConfig config )
      {
           this.config = config ?? new MyConfig();
      }

      public void MyMethod()
      {
          string property = this.config.MyProperty;

          ...
      }
 }

测试

 public void TestMethod()
 {
      IMyConfig config = MockRepository.GenerateMock<IMyConfig>();
      config.Expect( c => c.MyProperty ).Return( "stringValue" );

      var cls = new MyLib( config );

      cls.MyMethod();

      config.VerifyAllExpectations();
 }