ImageSharp/tests/ImageSharp.Tests/Image/MockImageFormatDetector.cs

// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

using System.Diagnostics.CodeAnalysis;
using SixLabors.ImageSharp.Formats;

namespace SixLabors.ImageSharp.Tests;

/// <summary>
///  You can't mock the "DetectFormat" method due to the  ReadOnlySpan{byte} parameter.
/// </summary>
public class MockImageFormatDetector : IImageFormatDetector
{
    private readonly IImageFormat localImageFormatMock;

    public MockImageFormatDetector(IImageFormat imageFormat)
        => this.localImageFormatMock = imageFormat;

    public int HeaderSize => 1;

    public bool TryDetectFormat(ReadOnlySpan<byte> header, [NotNullWhen(true)] out IImageFormat? format)
    {
        format = this.localImageFormatMock;

        return true;
    }
}