c# - 在C#中使用FakeItEasy伪造INI配置文件设置

我有一个从抽象Configuration类继承的类，然后每个类为INI文件，XML，conf或专有格式实现读取器。我在使用FakeItEasy创建要测试的对象时遇到问题。

我尝试测试的对象通过依赖注入使用配置对象，因此它可以通过调用ReadString（），ReadInteger（）等函数，然后通过位置文本（Section，Key for例如，使用INI的实例）可以以任何格式的配置文件（INI，XML，conf等）从相应的节中检索。

使用的示例代码：

public class TestFile
{
    private readonly ConfigurationSettings ConfigurationController_ ;

    ...

    public TestFile(ConfigurationSettings ConfigObject)
    {
        this.ConfigurationController_ = ConfigObject;
    }

    public TestFile(XMLFile ConfigObject)
    {
        this.ConfigurationController_ = ConfigObject;
    }

    public TestFile(INIFile ConfigObject)
    {
        this.ConfigurationController_ = ConfigObject;
    }

    ...

    private List<string> GetLoginSequence()
    {
        List<string> ReturnText = new List<string>();
        string SignOnFirst = ConfigurationController_.ReadString("SignOn", "SignOnKeyFirst", "Y");
        string SendEnterClear = ConfigurationController_.ReadString("SignOn", "SendEnterClear", "N");

        if (SendEnterClear.Equals("Y", StringComparison.CurrentCultureIgnoreCase))
        {
            ReturnText.Add("enter");
            ReturnText.Add("clear");
        }

        if (SignOnFirst.Equals("N", StringComparison.CurrentCultureIgnoreCase))
        {
            ReturnText.AddRange(MacroUserPassword("[$PASS]"));
            ReturnText.Add("sign_on");
        }
        else
        {
            ReturnText.Add("sign_on");
            ReturnText.AddRange(MacroUserId("[$USER]"));
            ReturnText.AddRange(MacroUserPassword("[$PASS]"));
        }
        return ReturnText;
    }

一个简单的测试示例：

    [TestMethod]
    public void TestSignOnSequence()

        IniReader FakeINI = A.Fake<IniReader>();

        //Sample Reads:
        //Config.ReadString("SignOn", "SignOnKeyFirst", "Y");
        //Config.ReadString("SignOn", "SendEnterClear", "N");  // Section, Key, Default

        A.CallTo(() => FakeINI.ReadString(A<string>.That.Matches(s => s == "SignOn"), A<string>.That.Matches(s => s == "SendEnterClear"))).Returns("N");
        A.CallTo(() => FakeINI.ReadString(A<string>.That.Matches(s => s == "SignOn"), A<string>.That.Matches(s => s == "SignOnKeyFirst"))).Returns("N");

        A.CallTo(FakeINI).Where( x => x.Method.Name == "ReadInteger").WithReturnType<int>().Returns(1000);

        TestFile TestFileObject = new TestFile(FakeINI);

        List<string> ReturnedKeys = TestFileObject.GetLoginSequence();
        Assert.AreEqual(2, ReturnedKeys.Count, "Ensure all keystrokes are returned");

这样编译就可以了，但是当我执行代码时，出现以下异常：

Test threw Exception:
FakeItEasy.Configuration.FakeConfigurationException:
    The current proxy generator can not intercept the specified method for the following reason:
    - Non virtual methods can not be intercepted.

如果我更改了创建伪造品的方式，该伪造品将毫无例外地工作，那么对于同一函数的各种调用，我将无法获得不同的值。

A.CallTo(FakeINI).Where( x => x.Method.Name == "ReadString").WithReturnType<string>().Returns("N");

上面的方法不允许我控制该函数用于INI的不同调用的返回。

如何结合这两种方法，参数的位置和测试？

要求的其他定义：

public abstract class ConfigurationSettings
{
    ...

    abstract public int ReadInteger(string Section, string Key, int Default);
    abstract public string ReadString(string Section, string Key, string Default);

    public int ReadInteger(string Section, string Key)
    {   return ReadInteger(Section, Key, 0);    }

    public int ReadInteger(string Key, int Default)
    {   return ReadInteger("", Key, Default);   }

    public int ReadInteger(string Key)
    {   return ReadInteger(Key, 0);             }

    public string ReadString(string Section, string Key)
    {   return ReadString(Section, Key, null);  }
}

public class IniReader : ConfigurationSettings
{
    ...

    public IniReader()
    {
    }

    public IniReader(string PathAndFile)
    {
        this.PathAndFileName = PathAndFile;
    }

    public override int ReadInteger(string Section, string Key, int Default)
    {
        return GetPrivateProfileInt(Section, Key, Default, PathAndFileName);
    }

    public override string ReadString(string Section, string Key, string Default)
    {
        StringBuilder WorkingString = new StringBuilder(MAX_ENTRY);
        int Return = GetPrivateProfileString(Section, Key, Default, WorkingString, MAX_ENTRY, PathAndFileName);
        return WorkingString.ToString();
    }
}

最佳答案

你正在


  由于以下原因，当前代理生成器无法拦截指定的方法：
  -无法拦截非虚拟方法。


错误，因为您试图伪造ReadString的2参数版本。 Only virtual members, abstract members, or interface members can be faked。由于您的两个参数ReadString都不是，因此不能伪造。我认为您应该具有虚拟的2参数ReadString或伪造3参数ReadString。

您的示例将我推向伪造3参数ReadString的角色，尤其是因为GetLoginSequence使用该参数。然后，我认为您可以只使用表达式（而不是方法名称字符串）来约束，并且都可以解决。

我对您的代码进行了一些测试（大部分来自更新之前），并成功伪造了三参数ReadString：

[Test]
public void BlairTest()
{
    IniReader FakeINI = A.Fake<IniReader>();

    A.CallTo(() => FakeINI.ReadString("SignOn", "SendEnterClear", A<string>._)).Returns("N");
    A.CallTo(() => FakeINI.ReadString("SignOn", "SignOnKeyFirst", A<string>._)).Returns("N");

    // Personally, I'd use the above syntax for this one too, but I didn't
    // want to muck too much.
    A.CallTo(FakeINI).Where(x => x.Method.Name == "ReadInteger").WithReturnType<int>().Returns(1000);


    TestFile TestFileObject = new TestFile(FakeINI);

    List<string> ReturnedKeys = TestFileObject.GetLoginSequence();
    Assert.AreEqual(2, ReturnedKeys.Count, "Ensure all keystrokes are returned");
}