.NET-Community-Toolkit/tests/CommunityToolkit.HighPerformance.UnitTests/Helpers/Test_ParallelHelper.ForEach.Ref2D.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using CommunityToolkit.HighPerformance.Helpers;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace CommunityToolkit.HighPerformance.UnitTests.Helpers;

public partial class Test_ParallelHelper
{
    [TestMethod]
    [DataRow(1, 1, 0, 0, 1, 1)]
    [DataRow(1, 2, 0, 0, 1, 2)]
    [DataRow(2, 3, 0, 0, 2, 3)]
    [DataRow(2, 3, 0, 1, 2, 2)]
    [DataRow(3, 3, 1, 1, 2, 2)]
    [DataRow(12, 12, 2, 4, 3, 3)]
    [DataRow(64, 64, 0, 0, 32, 32)]
    [DataRow(64, 64, 13, 14, 23, 22)]
    public void Test_ParallelHelper_ForEach_Ref2D(
        int sizeY,
        int sizeX,
        int row,
        int column,
        int height,
        int width)
    {
        int[,] data = CreateRandomData2D(sizeY, sizeX);
        int[,] copy = (int[,])data.Clone();

        // Prepare the target data iteratively
        foreach (ref int n in copy.AsSpan2D(row, column, height, width))
        {
            n = unchecked(n * 397);
        }

        Memory2D<int> memory = data.AsMemory2D(row, column, height, width);

        Assert.AreEqual(memory.Length, height * width);
        Assert.AreEqual(memory.Height, height);
        Assert.AreEqual(memory.Width, width);

        // Do the same computation in parallel, then compare the two arrays
        ParallelHelper.ForEach(memory, new Multiplier(397));

        CollectionAssert.AreEqual(data, copy);
    }
}