c# - OO 中的单元测试和访问修饰符

Question

我注意到，为了对我的 OO 代码中的每个单元进行单元测试，我需要将访问修饰符设置为 public，即使在应该 protected 或可能是私有(private)的方法上也是如此。这是正确的做法吗？

public class EnforceBusinessRules
{
    BusinessState m_state;

    public EnforceBusinessRules()
    {
        m_state = START;
    }


    public bool isInputcurrentlyFormatted(string input)
    {
        //code goes here to ensure the input passes formatting test
        //modify m_state appropriately
    }


    public bool InputContainsValidStartAndEndTokens(string input)
    {
        //code goes here to ensure that the start and end tokens of the input are of the type available in the system
        //modify m_state appropriately
    }


    public bool StartEndCommandisValidAccordingtoCurrentSystemSettings(string input)
    {
        //code goes here to check the start and End codes match the current start and end codes for the day
        //modify m_state appropriately
    }

    // and so on 
}

Answer 1

单元测试是“黑盒”测试。您应该只测试外部可见的元素。如果您测试所有内部工作原理，那么如果不修改所有单元测试就无法正确重构代码。