c#-Parallel.ForEach中的Mock方法始终返回null
作者：互联网
我有以下代码：
public int LoadFilesAndSaveInDatabase(string filesPath)
{
var calls = new ConcurrentStack<GdsCallDto>();
var filesInDirectory = this._directoryProxy.GetFiles(filesPath);
if (filesInDirectory.Any())
{
Parallel.ForEach(filesInDirectory, file =>
{
var lines = this._fileProxy.ReadAllLines(file, Encoding.Unicode);
if (lines.Any())
{
// Reads the file and setup a new DTO.
var deserializedCall = this._fileManager.DeserializeFileContent(lines, Path.GetFileName(file));
// Insert the DTO in the database.
this._gdsCallsData.InsertOrUpdateGdsCall(deserializedCall);
// We keep track of the dto to count the number of restored items.
calls.Push(deserializedCall);
}
});
}
return calls.Count;
}
我有以下单元测试：
[TestMethod]
public void ShouldLoadFilesAndSaveInDatabase()
{
// Arrange
var path = RandomGenerator.GetRandomString(56);
var encoding = Encoding.Unicode;
var fileNameEnvironment = RandomGenerator.GetRandomString();
var fileNameModule = RandomGenerator.GetRandomString();
var fileNameRecordLocator = RandomGenerator.GetRandomString(6);
var fileNameTimestamp = RandomGenerator.GetRandomDateTime().ToString("O").Replace(':', 'o');
// We simulate the presence of 4 files.
var files = new List<string>
{
RandomGenerator.GetRandomString(255),
RandomGenerator.GetRandomString(255),
RandomGenerator.GetRandomString(255),
RandomGenerator.GetRandomString(255)
}.ToArray();
var expectedResult = 4;
this._directoryProxy.Expect(d => d.GetFiles(path))
.Return(files);
this._fileProxy.Expect(f => f.ReadAllLines(path, encoding))
.Return(files).Repeat.Times(files.Length);
// Act
var result = this._databaseReloadManager.LoadFilesAndSaveInDatabase(path);
// Assert
Assert.AreEqual(result, expectedResult);
this._directoryProxy.AssertWasCalled(d => d.GetFiles(path));
this._fileProxy.AssertWasCalled(f => f.ReadAllLines(path, Encoding.Unicode));
}
问题在以下行中：
var lines = this._fileProxy.ReadAllLines(file, Encoding.Unicode);
即使我设置了期望值和返回值,但在运行单元测试时,它始终返回null.
我正在使用Rhino.Mocks,它在其他地方也可以正常工作,但不在那儿.
我在这里看了一些讨论,但没有一个有帮助.可能是由于使用Parallel.ForEach吗？有没有办法做这样的模拟？
如果您需要其他任何信息,请告诉我.
解决方法:
我认为并行化没有问题.看来您的问题与Rhino Mock的代理实例设置有关.
确保传递给ReadAllLines的参数与在生产代码中运行时所调用的参数相同.
this._fileProxy.Expect(f => f.ReadAllLines(path, encoding))
.Return(files).Repeat.Times(files.Length);
例如,如果您设置了不同的路径,并且在执行测试时该路径的值不同,那么您可能会看到NULL.但是,如果没有在代码中看到完整的安装程序/构造函数,就很难说出来.还要检查随机生成器,看看每次都使用了什么.
以下是我整理并为我工作的内容.
工作意味着我不会因以下原因而得到NULL：
var lines = this._fileProxy.ReadAllLines(file, Encoding.Unicode);
//some dummy code so I can compile
public interface IProxyDir
{
IEnumerable<string> GetFiles(string path);
}
public class GdsCallDto
{
}
public class Proxy : IProxyDir
{
public IEnumerable<string> GetFiles(string path)
{
throw new NotImplementedException();
}
}
public interface IFileDir
{
IEnumerable<string> ReadAllLines(string path, Encoding encoding);
}
public class FileProxy : IFileDir
{
public IEnumerable<string> ReadAllLines(string path, Encoding encoding)
{
throw new NotImplementedException();
}
}
public interface IFileMgr
{
string DeserializeFileContent(IEnumerable<string> lines, string content);
}
public class FileMgr : IFileMgr
{
public string DeserializeFileContent(IEnumerable<string> lines, string content)
{
throw new NotImplementedException();
}
}
//system under test
public class Sut
{
private IProxyDir _directoryProxy;
private IFileDir _fileProxy;
private IFileMgr _fileManager;
public Sut(IProxyDir proxyDir, IFileDir fileProxy, IFileMgr mgr)
{
_fileManager = mgr;
_directoryProxy = proxyDir;
_fileProxy = fileProxy;
}
public int LoadFilesAndSaveInDatabase(string filesPath)
{
var calls = new ConcurrentStack<GdsCallDto>();
var filesInDirectory = this._directoryProxy.GetFiles(filesPath);
if (filesInDirectory.Any())
{
Parallel.ForEach(filesInDirectory, file =>
{
var lines = this._fileProxy.ReadAllLines("ssss", Encoding.Unicode);
if (lines.Any())
{
// Reads the file and setup a new DTO.
var deserializedCall = this._fileManager.DeserializeFileContent(lines, Path.GetFileName("file"));
// Insert the DTO in the database.
//this._gdsCallsData.InsertOrUpdateGdsCall(deserializedCall);
// We keep track of the dto to count the number of restored items.
//calls.Push(deserializedCall);
}
});
}
return 1;
}
}
样品单元测试
[TestClass]
public class UnitTest1
{
private IProxyDir _directoryProxy;
private IFileDir _fileProxy;
private IFileMgr _fileMgr;
private Sut _sut;
public UnitTest1()
{
_directoryProxy = MockRepository.GenerateMock<IProxyDir>();
_fileProxy = MockRepository.GenerateMock<IFileDir>();
_fileMgr = MockRepository.GenerateMock<IFileMgr>();
}
[TestMethod]
public void ShouldLoadFilesAndSaveInDatabase()
{
// Arrange
var path = RandomGenerator.GetRandomString(56);
var encoding = Encoding.Unicode;
var fileNameEnvironment = RandomGenerator.GetRandomString(5);
var fileNameModule = RandomGenerator.GetRandomString(5);
var fileNameRecordLocator = RandomGenerator.GetRandomString(6);
var fileNameTimestamp = RandomGenerator.GetRandomDateTime().ToString("O").Replace(':', 'o');
// We simulate the presence of 4 files.
var files = new List<string>
{
RandomGenerator.GetRandomString(255),
RandomGenerator.GetRandomString(255),
RandomGenerator.GetRandomString(255),
RandomGenerator.GetRandomString(255)
}.ToArray();
var expectedResult = 4;
this._directoryProxy.Expect(d => d.GetFiles(path))
.Return(files);
this._fileProxy.Expect(f => f.ReadAllLines(path, encoding))
.Return(files).Repeat.Times(files.Length);
_sut = new Sut(_directoryProxy, _fileProxy, _fileMgr);
// Act
var result = this._sut.LoadFilesAndSaveInDatabase(path);
// Assert
Assert.AreEqual(result, expectedResult);
this._directoryProxy.AssertWasCalled(d => d.GetFiles(path));
this._fileProxy.AssertWasCalled(f => f.ReadAllLines(path, Encoding.Unicode));
}
}
internal class RandomGenerator
{
public static string GetRandomString(int number)
{
return "ssss";
}
public static DateTime GetRandomDateTime()
{
return new DateTime();
}
}
标签：parallel-foreach,unit-testing,c,rhino-mocks 来源： https://codeday.me/bug/20191027/1940671.html