public void SetAccessControl_FileStream_FileSecurity_InvalidFileSecurityObject()
{
using var directory = new TempDirectory();
using var file = new TempFile(Path.Combine(directory.Path, "file.txt"));
using FileStream fileStream = File.Open(file.Path, FileMode.Append, FileAccess.Write, FileShare.None);
AssertExtensions.Throws <ArgumentNullException>("fileSecurity", () => FileSystemAclExtensions.SetAccessControl(fileStream, fileSecurity: null));
}