QWERTYkez.Mensura/QWERTYkez.Mensura.Tests/CollectionsPow3ExtensionsTest.cs

namespace QWERTYkez.Mensura.Tests;

public class CollectionsPow3ExtensionsTest
{
    [Fact]
    public void Pow3_Array_CalculatesCorrectly()
    {
        // Arrange: 2^3=8, 3^3=27, 4^3=64
        Length[] source = [new(2), new(3), new(4)];

        // Act
        Length[] result = source.Pow3<Length, Length>();

        // Assert
        Assert.Equal(8, result[0]._Value);
        Assert.Equal(27, result[1]._Value);
        Assert.Equal(64, result[2]._Value);
    }

    [Fact]
    public void Pow3_NullableArray_HandlesNulls()
    {
        // Arrange
        Length?[] source = [new(5), null, new(10)];

        // Act
        Length?[] result = source.Pow3<Length, Length>();

        // Assert
        Assert.Equal(125, result[0]?._Value);
        Assert.Null(result[1]);
        Assert.Equal(1000, result[2]?._Value);
    }

    [Fact]
    public void Pow3_List_ReturnsCorrectResult()
    {
        // Arrange
        var source = new List<Length> { new(2), new(5) };

        // Act
        var result = source.Pow3<Length, Length>();

        // Assert
        Assert.Equal(8, result[0]._Value);
        Assert.Equal(125, result[1]._Value);
    }

    [Fact]
    public void Pow3_DestinationTooShort_ThrowsArgumentException()
    {
        // Arrange
        Length[] source = [new(2), new(3)];
        Length[] dest = new Length[1];

        // Act & Assert
        Assert.Throws<ArgumentException>(() => source.Pow3(dest));
    }
}