AmiReel/AmiReel.Tests/Models/SourceCropSelectionTests.cs

using AmiReel.Models;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace AmiReel.Tests.Models;

[TestClass]
public class SourceCropSelectionTests
{
    [TestMethod]
    public void FitUniform_WiderContainer_LetterboxesHorizontally()
    {
        // Act
        (double offsetX, double offsetY, double width, double height) =
            SourceCropSelection.FitUniform(400, 200, 100, 100);

        // Assert
        Assert.AreEqual(100, offsetX);
        Assert.AreEqual(0, offsetY);
        Assert.AreEqual(200, width);
        Assert.AreEqual(200, height);
    }

    [TestMethod]
    public void FitUniform_TallerContainer_LetterboxesVertically()
    {
        // Act
        (double offsetX, double offsetY, double width, double height) =
            SourceCropSelection.FitUniform(200, 400, 100, 100);

        // Assert
        Assert.AreEqual(0, offsetX);
        Assert.AreEqual(100, offsetY);
        Assert.AreEqual(200, width);
        Assert.AreEqual(200, height);
    }

    [TestMethod]
    public void ToInsets_FullFrameSelection_ReturnsEmptyInsets()
    {
        // Act
        PixelInsets insets = SourceCropSelection.ToInsets(640, 512, 640, 512, 0, 0, 640, 512);

        // Assert
        Assert.IsTrue(insets.IsEmpty);
    }

    [TestMethod]
    public void ToInsets_CenteredSelection_ComputesAllFourEdges()
    {
        // Act
        PixelInsets insets = SourceCropSelection.ToInsets(100, 100, 100, 100, 10, 20, 70, 50);

        // Assert
        Assert.AreEqual(10, insets.Left);
        Assert.AreEqual(20, insets.Right);
        Assert.AreEqual(20, insets.Top);
        Assert.AreEqual(30, insets.Bottom);
    }

    [TestMethod]
    public void ToInsets_DraggedUpAndLeft_NormalizesTheRectangle()
    {
        // Act
        PixelInsets insets = SourceCropSelection.ToInsets(100, 100, 100, 100, 80, 70, -70, -50);

        // Assert
        Assert.AreEqual(10, insets.Left);
        Assert.AreEqual(20, insets.Right);
        Assert.AreEqual(20, insets.Top);
        Assert.AreEqual(30, insets.Bottom);
    }

    [TestMethod]
    public void ToDisplayRect_RoundTripsKnownInsets()
    {
        // Arrange
        PixelInsets insets = new(20, 20, 10, 10);

        // Act
        (double x, double y, double width, double height) =
            SourceCropSelection.ToDisplayRect(100, 100, 200, 200, insets);

        // Assert
        Assert.AreEqual(40, x);
        Assert.AreEqual(20, y);
        Assert.AreEqual(120, width);
        Assert.AreEqual(160, height);
    }

    [TestMethod]
    public void ClampToDisplay_OutsideBounds_ClampsToEdges()
    {
        // Act
        (double x, double y) = SourceCropSelection.ClampToDisplay(-8, 90, 80, 60);

        // Assert
        Assert.AreEqual(0, x);
        Assert.AreEqual(60, y);
    }
}