当一个成员被调用时，也可。

1     public interface ICalculator 2     { 3       int Add(int a, int b); 4       string Mode { get; set; } 5     } 6  7     [TestMethod] 8     [ExpectedException(typeof(Exception))] 9     public void Test_ThrowingExceptions_ForVoid()10     {11       var calculator = Substitute.For
     
      ();12 13       // 对无返回值函数14       calculator.Add(-1, -1).Returns(x => { throw new Exception(); });15 16       // 抛出异常17       calculator.Add(-1, -1);18     }19 20     [TestMethod]21     [ExpectedException(typeof(Exception))]22     public void Test_ThrowingExceptions_ForNonVoidAndVoid()23     {24       var calculator = Substitute.For
      
       ();25 26       // 对有返回值或无返回值函数27       calculator28         .When(x => x.Add(-2, -2))29         .Do(x => { throw new Exception(); });30 31       // 抛出异常32       calculator.Add(-2, -2);33     }
      
     

NSubstitute 完全手册