如何在需要大文件的地方测试代码

Question

我有一些视频文件，我需要每次我运行我的应用程序。它检查HD的可用空间是否小于1千兆字节，如果是真的，继续删除最旧的日期文件等，直到有足够的可用空间。

        foreach (DriveInfo drive in DriveInfo.GetDrives())
        {
            if (drive.IsReady && drive.Name == "E:\")
            {
                if (drive.TotalFreeSpace < 10000000)
                {
                    do
                    {
                        DirectoryInfo info = new DirectoryInfo(@"E:RECVideo");
                        FileInfo[] files = info.GetFiles().OrderBy(p => p.LastWriteTime).ToArray();
                        System.IO.File.Delete(@"E:RECVideo" + files[0].Name);
                    }
                    while (drive.TotalFreeSpace < 10000000);
                }
            }
        }

视频文件是在几个月的时间里自动生成(录制)的。
所以:我如何测试这段代码，而不必等到我的磁盘空间满了?

Answer 1

我会把代码放在它自己的方法中。将所需的磁盘空间放入参数中:

public class HdCleaner
{
    public static void DeleteOldestFiles(long minimumAvailableSpace, string path)
    {
        var driveLetter = Path.GetPathRoot(path);
        var drive1 = DriveInfo.GetDrives().Where(d => d.IsReady).Single(d => d.Name == driveLetter);
        while (drive1.TotalFreeSpace <= minimumAvailableSpace)
        {
            var info = new DirectoryInfo(path);
            var file = info.GetFiles().OrderBy(p => p.LastWriteTime).First();
            file.Delete();
        }
    }
}

进行单元测试:确保路径中有可以删除的文件。

    [TestMethod]
    public void DeleteOldestFilesTest()
    {
        const string driveLetter = "C:\";
        const string path = "C:\Users\user\FileCleanerTest";
        var drive = DriveInfo.GetDrives().Where(d => d.IsReady).Single(d => d.Name == driveLetter);
        var availableSpace = drive.TotalFreeSpace;
        var neededSpace = availableSpace + 10000;
        HdCleaner.DeleteOldestFiles(neededSpace,  path);
        var newAvailableSpace = drive.TotalFreeSpace;
        Assert.IsTrue(newAvailableSpace >= neededSpace);
    }

注::我做了一些重构;)

Answer 2

我测试了它，我替换了10000000，所以我右键单击驱动器并复制当前可用空间添加一些字节，它工作了，我不得不改变它一点，像这样:

            foreach (DriveInfo drive in DriveInfo.GetDrives())
        {
            if (drive.IsReady && drive.Name == "E:\")
            {
                if (drive.TotalFreeSpace <= 245000000000000)
                {
                    try
                    {
                        while (drive.TotalFreeSpace <= 245000000000000)
                        {
                            DirectoryInfo info = new DirectoryInfo(@"E:RECVideo");
                            FileInfo[] files = info.GetFiles().OrderBy(p => p.LastWriteTime).ToArray();
                            System.IO.File.Delete(@"E:RECVideo" + files[0].Name);
                        }
                    }
                    catch
                    {
                    }
                }
            }
        }