Catalog/MaddoShared.Tests/ImageCreatorSharpTests.cs

using System.Reflection;
using MaddoShared;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using Shouldly;
using SixLabors.ImageSharp;

namespace MaddoShared.Tests;

[TestClass]
public class ImageCreatorSharpTests
{
    [TestMethod]
    public void CalculateThumbnailSize_Larghezza_UsesWidthScaling()
    {
        var size = CalculateThumbnailSize(400, 200, 200, "Larghezza");

        size.Width.ShouldBe(200);
        size.Height.ShouldBe(100);
    }

    [TestMethod]
    public void CalculateThumbnailSize_Altezza_UsesHeightScaling()
    {
        var size = CalculateThumbnailSize(200, 400, 200, "Altezza");

        size.Width.ShouldBe(100);
        size.Height.ShouldBe(200);
    }

    [TestMethod]
    public void FindBestFontSize_ConstrainsTextToBounds()
    {
        const string text = "A very long text that will not fit at the requested size";
        var method = typeof(ImageCreatorImageSharp).GetMethod(
            "FindBestFontSize",
            BindingFlags.NonPublic | BindingFlags.Static);

        method.ShouldNotBeNull();

        var size = (float)method.Invoke(null, new object[]
        {
            text,
            "Arial",
            40,
            50f,
            20f,
            6
        })!;

        size.ShouldBeInRange(6f, 40f);
        (size * text.Length * 0.6f <= 50f || size <= 6f).ShouldBeTrue();
    }

    private static Size CalculateThumbnailSize(int width, int height, int maxPixel, string sizeMode)
    {
        var method = typeof(ImageCreatorImageSharp).GetMethod(
            "CalculateThumbnailSize",
            BindingFlags.NonPublic | BindingFlags.Static);

        method.ShouldNotBeNull();
        return (Size)method.Invoke(null, new object[] { width, height, maxPixel, sizeMode })!;
    }
}