如this question所述,我正在研究一种方法,该方法返回一个List<FileInfo>
中不存在于另一个List<FileInfo>
中的元素。我实现了Nawfal的解决方案如下:为什么此CollectionAssert.AreEquivalent()测试失败?
public List<FileInfo> SourceNotInDest(List<FileInfo> SourceFiles, List<FileInfo> DestFiles)
{
var notInDest = SourceFiles.Where(c => !DestFiles.Any(p => p.Name == c.Name)).ToList();
return notInDest;
}
我对SourceFiles数据集是:
u:\folder1\a.txt
u:\folder1\b.txt
u:\folder1\c.txt
u:\folder1\d.txt
DestFiles是:
u:\folder2\a.txt
u:\folder2\b.txt
u:\folder2\c.txt
当我单步执行代码,并检查清单'值,这似乎返回预期的结果。但单元测试失败,出现以下的代码:
public void SourceNotInDestTest()
{
//arrange
FileListComparer flc = new FileListComparer(); //class that has the list compare method
FolderReader fr = new FolderReader(); //class for getting FileInfo from folder
List<FileInfo> expectedResult = new List<FileInfo>();
expectedResult.Add(new FileInfo(@"U:\folder1\d.txt"));
List<FileInfo> SourceFiles = fr.fileList(@"U:\folder1"); //gets the FileInfo for each file in the folder
List<FileInfo> DestFiles = fr.fileList(@"U:\folder2");
//act
List<FileInfo> result = flc.SourceNotInDest(FTPFiles, LocalFiles);
//assert
CollectionAssert.AreEquivalent(result, expectedResult);
}
即使result
和expectedResult
具有相同的内容 - 这两个列表具有相同的文件路径和同其它特性的一个元件 - 测试失败与消息:
CollectionAssert.AreEquivalent failed. The expected collection contains 1 occurrence(s)
of <U:\folder1\d.txt>. The actual collection contains 0 occurrence(s).
expectedResult
确实有U:\folder1\d.txt
发生,虽然。我想也许问题是我比较两个对象的内存地址而不是这些对象的内容,但我认为AreEquivalent()
比较属性。情况并非如此吗?
编辑:基于有关比较,而不是地址属性中的建议,我用这个断言代替,这使得测试通过:
foreach (FileInfo fi1 in result)
{
Assert.IsNotNull(expectedResult.Find(fi2 => fi2.FullName == fi1.FullName));
}
foreach (FileInfo fi1 in expectedResult)
{
Assert.IsNotNull(result.Find(fi2 => fi2.FullName == fi1.FullName));
}