FileAccess parameter in File.Open() is ignored when the FileMode is Create or CreateNew.

[willson556]

Describe the bug

FileAccess parameter in File.Open() is ignored when the FileMode is Create or CreateNew. Bug can be observed by checking the CanRead property of the returned Stream with FileAccess.ReadWrite.

To Reproduce
Below code snippet compares actual behavior to the mock:

var tempFile = Path.GetTempFileName();
using var fs = File.Open(tempFile, FileMode.Create);
Console.WriteLine(fs.CanRead);

var mock = new MockFileSystem();
var mockFile = mock.Path.GetTempFileName();
using var mockFs = mock.File.Open(mockFile, FileMode.Create);
Console.WriteLine(mockFs.CanRead);

Output:

True
False

Expected behavior

Mock behavior should match the .NET type.

[github-actions]

This is addressed in release v13.2.25.