MockFileStreamFactory.cs

using System.Security.AccessControl;
using Microsoft.Win32.SafeHandles;

namespace System.IO.Abstractions.TestingHelpers;

/// <inheritdoc />
#if FEATURE_SERIALIZABLE
[Serializable]
#endif
public class MockFileStreamFactory : IFileStreamFactory
{
    private readonly IMockFileDataAccessor mockFileSystem;

    /// <inheritdoc />
    public MockFileStreamFactory(IMockFileDataAccessor mockFileSystem)
        => this.mockFileSystem = mockFileSystem ?? throw new ArgumentNullException(nameof(mockFileSystem));
        
    /// <inheritdoc />
    public IFileSystem FileSystem
        => mockFileSystem;

    /// <inheritdoc />
    public FileSystemStream New(SafeFileHandle handle, FileAccess access)
        => new MockFileStream(mockFileSystem, handle.ToString(), FileMode.Open, access: access);

    /// <inheritdoc />
    public FileSystemStream New(SafeFileHandle handle, FileAccess access, int bufferSize)
        => new MockFileStream(mockFileSystem, handle.ToString(), FileMode.Open, access: access);

    /// <inheritdoc />
    public FileSystemStream New(SafeFileHandle handle, FileAccess access, int bufferSize, bool isAsync)
        => new MockFileStream(mockFileSystem, handle.ToString(), FileMode.Open, access: access);

    /// <inheritdoc />
    public FileSystemStream New(string path, FileMode mode)
        => new MockFileStream(mockFileSystem, path, mode);

    /// <inheritdoc />
    public FileSystemStream New(string path, FileMode mode, FileAccess access)
        => new MockFileStream(mockFileSystem, path, mode, access);

    /// <inheritdoc />
    public FileSystemStream New(string path, FileMode mode, FileAccess access, FileShare share)
        => new MockFileStream(mockFileSystem, path, mode, access);

    /// <inheritdoc />
    public FileSystemStream New(string path, FileMode mode, FileAccess access, FileShare share, int bufferSize)
        => new MockFileStream(mockFileSystem, path, mode, access);

    /// <inheritdoc />
    public FileSystemStream New(string path, FileMode mode, FileAccess access, FileShare share, int bufferSize, bool useAsync)
        => new MockFileStream(mockFileSystem, path, mode, access);

    /// <inheritdoc />
    public FileSystemStream New(string path, FileMode mode, FileAccess access, FileShare share, int bufferSize,
        FileOptions options)
        => new MockFileStream(mockFileSystem, path, mode, access, options);

#if FEATURE_FILESTREAM_OPTIONS
    /// <inheritdoc />
    public FileSystemStream New(string path, FileStreamOptions options)
        => new MockFileStream(mockFileSystem, path, options.Mode, options.Access, options.Options);
#endif

    /// <inheritdoc />
    public FileSystemStream Wrap(FileStream fileStream)
        => throw new NotSupportedException("You cannot wrap an existing FileStream in the MockFileSystem instance!");
}