OpenWrite doesn't prevent writing

[Benjamin-Berry]

Describe the bug Stream.CopyTpAsync still works with a write only stream.

To Reproduce var fs = new MockFileSystem();

...

using var estream = entry.Open(); using var fstream = file.OpenWrite(); var temp = fstream.CanRead; // false await fstream.CopyToAsync(estream);

Expected behavior MockFileSystem and FileSystem would behave the same.

Additional context I'm writing into a ZipArchive but that shouldn't matter. Swapping to use FileSystem in the Unit test does throw a permissions exception.

[vbreuss]

@Benjamin-Berry : Could you please provide a complete repro example as it is unclear from your description what entry and file should be or what settings you applied.

[Benjamin-Berry]

I can't give you any proprietary code.

var fs = new MockFileSystem(); var directory = fs.DirectoryInfo.New("somepath"); foreach (var file in directory.GetFiles(".", SearchOption.AllDirectories)) { using var estream = new MemoryStream(); using var fstream = file.OpenWrite(); var temp = fstream.CanRead; // false await fstream.CopyToAsync(estream); }

[github-actions[bot]]

This is addressed in release v21.1.2.