MockFileSystem created file don't exist

Describe the bug
From version 16.0.8 of System.IO.Abstractions.TestingHelpers when I create new file in MockFileSystem property Exist return false.

To Reproduce

IFileSystem fileSystem = new MockFileSystem();
IFileInfo fileInfo = fileSystem.FileInfo.FromFileName("testFile.txt");
using (Stream fs = fileInfo.Create()) 
{
    fs.WriteByte(0);
}
Console.WriteLine($"File exist: {fileInfo.Exists}");

Version 16.0.7 return True
Version 16.0.8 return False

Expected behavior
Property Exist should return True

@milten89

@milten89 Thanks for taking the time to report this!

The behavior of MockFileInfo has changed in #791 to mirror the behavior of the real file system (see #661).

Could you please check how your code behaves with the real file system?

@fgreinacher

@fgreinacher there is difference in output for FileSystem and MockFileSystem.

public static void Main(string[] args)
{
    IFileSystem realFileSystem = new FileSystem();
    IFileSystem mockFileSystem = new MockFileSystem();
    Console.WriteLine($"Real file exist: {TestFileSystem(realFileSystem)}");
    Console.WriteLine($"Fake file exist: {TestFileSystem(mockFileSystem)}");
    Console.ReadLine();
}

private static bool TestFileSystem(IFileSystem fileSystem)
{
    IFileInfo fileInfo = null; 
    try
    {
        fileInfo = fileSystem.FileInfo.FromFileName("testFile.txt");
        using (Stream fs = fileInfo.Create()) 
            fs.WriteByte(0);

        return fileInfo.Exists;
    }
    finally
    {
        if (fileInfo != null && fileInfo.Exists)
            fileInfo.Delete();
    }
}

Starts from version 16.0.8 FileSystem return True and MockFileSystem return False.
In latest version 16.1.23 result is same.

Additional to that, there is difference in paths for FileSystem and MockFileSystem.

FileSystem:

C:\Users\Andrzej Ochodek\source\repos\FileSystemAbstractionTest\FileSystemAbstractionTest\bin\Debug\testFile.txt

MockFileSystem:

C:\testFile.txt

Are there any updates about this bug?

Are there any updates about this bug?

Sorry, I lost track of this one.

Starts from version 16.0.8 FileSystem return True and MockFileSystem return False.
In latest version 16.1.23 result is same.

Do I understand correctly that everything is working as expected in 16.1.23?

Additional to that, there is difference in paths for FileSystem and MockFileSystem.

That's expected/by-design, because the MockFileSystem is initialized with the root directory (/ on Unix, C:\ on Windows).

Do I understand correctly that everything is working as expected in 16.1.23?

Unfortunately no. Real file system returns true and mock returns false.

That's expected/by-design, because the MockFileSystem is initialized with the root directory (/ on Unix, C:\ on Windows).

Ok.

fix: MockFileInfo.Exists no longer returns stale cached data

I created a pull request to fix it, see #828

This is addressed in release v16.1.24.

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MockFileSystem created file don't exist #822

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fgreinacher commented on Mar 11, 2022

milten89 commented on Mar 15, 2022

milten89 commented on Mar 22, 2022

fgreinacher commented on Mar 22, 2022

milten89 commented on Mar 22, 2022

siprbaum commented on Mar 22, 2022

github-actions commented on Mar 23, 2022

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