Question

我需要对类的公共接口方法进行单元测试，但是定义的行为依赖于私有状态变量。像这样：

private enum _state;

public void Connect()
{
    if (_state == AlreadyConnected)
        throw Exception;

    (... do more things ...)
}

在这种情况下，我想确保在状态已经是特定值时调用方法时抛出正确的异常，但是如果状态字段是私有的，我该如何设置它呢？

Answer 1

在您的情况下，私人状态表示对实体执行的操作的结果及其对操作的反应所以，测试看起来像：

[Test]
public void Connect_throws_exception_if_already_connected()
{
       var foo = new Foo();
       foo.Connect();


       Exception thrownExc = null;

       try
       {
            foo.Connect();
       }
       catch(InvalidOperationException exc)
       {
           thrownExc = exc;
       }

       Assert.IsNotNull(thrownExc, "It was expected to get exception on 2nd connect attempt, but nothing were thrown.");
}

如何对依赖私有状态的公共行为进行单元测试？

1 个答案: