RhinoMocks AAA语法

Question

我花了很多时间试图弄清楚为什么简单的RhinoMocks测试不会返回我在返回时设置的值.我确信我只是错过了一些非常简单的东西,但我无法弄明白.这是我的测试:

    [TestMethod]
    public void CopyvRAFiles_ShouldCallCopyvRAFiles_ShouldReturnTrue2()
    {
        FileInfo fi = new FileInfo(@"c:\Myprogram.txt");
        FileInfo[] myFileInfo = new FileInfo[2];
        myFileInfo[0] = fi;
        myFileInfo[1] = fi;
        var mockSystemIO = MockRepository.GenerateMock<ISystemIO>();
        mockSystemIO.Stub(x => x.GetFilesForCopy("c:")).Return(myFileInfo);
        mockSystemIO.Expect(y => y.FileCopyDateCheck(@"c:\Myprogram.txt", @"c:\Myprogram.txt")).Return("Test");
        CopyFiles copy = new CopyFiles(mockSystemIO);

        List<string> retValue = copy.CopyvRAFiles("c:", "c:", new AdminWindowViewModel(vRASharedData));
        mockSystemIO.VerifyAllExpectations();
    }

我有一个我的SystemIO类的接口我正在通过模拟传递给我的CopyFiles类.我在我的FileCopyDatCheck方法上设置了一个期望,并说它应该返回("测试").当我单步执行代码时,它返回一个null insteaed.我在这里缺少什么想法？

这是我的CopyFiles类方法:

    public List<string> CopyvRAFiles(string currentDirectoryPath, string destPath, AdminWindowViewModel adminWindowViewModel)
    {
        string fileCopied;
        List<string> filesCopied = new List<string>();
        try
        {
            sysIO.CreateDirectoryIfNotExist(destPath);

            FileInfo[] files = sysIO.GetFilesForCopy(currentDirectoryPath);

            if (files != null)
            {
                foreach (FileInfo file in files)
                {
                    fileCopied = sysIO.FileCopyDateCheck(file.FullName, destPath + file.Name);
                    filesCopied.Add(fileCopied);
                }
            }

            //adminWindowViewModel.CheckFilesThatRequireSystemUpdate(filesCopied);

            return filesCopied;
        }
        catch (Exception ex)
        {
            ExceptionPolicy.HandleException(ex, "vRAClientPolicy");
            Console.WriteLine("{0} Exception caught.", ex);

            ShowErrorMessageDialog(ex);
            return null;
        }
    }

我认为"fileCopied"将具有Expect设置的Return值.GetFilesForCopy返回myFileInfo中的两个文件.请帮忙.:)

提前致谢!

Answer 1

有模拟不会开始返回记录答案,直到它被切换到回放模式下使用Replay().存根和模拟不会以同样的方式工作.我写了一篇关于差异的博客文章.

另请注意,您将旧的record-replay-verify语法与新的arrange-act-assert语法混合使用.使用AAA,你不应该使用模拟和Expect.相反,使用存根,AssertWasCalled像这样:

[TestMethod]
public void CopyvRAFiles_ShouldCallCopyvRAFiles_ShouldReturnTrue2()
{
    // arrange
    FileInfo fi = new FileInfo(@"c:\Myprogram.txt");
    FileInfo[] myFileInfo = new FileInfo[2];
    myFileInfo[0] = fi;
    myFileInfo[1] = fi;

    var stubSystemIO = MockRepository.GenerateStub<ISystemIO>();
    stubSystemIO.Stub(
        x => x.GetFilesForCopy(Arg<string>.Is.Anything)).Return(myFileInfo);
    stubSystemIO.Stub(
        y => y.FileCopyDateCheck(
            Arg<string>.Is.Anything, Arg<string>.Is.Anything)).Return("Test");

    CopyFiles copy = new CopyFiles(mockSystemIO);

    // act
    List<string> retValue = copy.CopyvRAFiles(
        "c:", "c:", new AdminWindowViewModel(vRASharedData));

    // make assertions here about return values, state of objects, stub usage
    stubSystemIO.AssertWasCalled(
        y => y.FileCopyDateCheck(@"c:\Myprogram.txt", @"c:\Myprogram.txt"));
}

请注意如何在开始时设置存根的行为与最后的断言分开.Stub不设定任何期望.

分离行为和断言的优点是,您可以在每次测试中减少断言次数,从而更容易诊断测试失败的原因.