QWERTYkez.Mensura/QWERTYkez.Mensura.Tests/CollectionsRootOfSquareExtensionsTest.cs

namespace QWERTYkez.Mensura.Tests;

public class CollectionsRootOfSquareExtensionsTest
{
    [Fact]
    public void Sqrt_Array_ShouldCalculateCorrectly()
    {
        // Arrange
        Length[] source = [new(4), new(9), new(16)];

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

        // Assert
        Assert.Equal(2, result[0]._Value);
        Assert.Equal(3, result[1]._Value);
        Assert.Equal(4, result[2]._Value);
    }

    [Fact]
    public void Sqrt_NullableArray_ShouldHandleNulls()
    {
        // Arrange
        Length?[] source = [new(25), null, new(100)];

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

        // Assert
        Assert.Equal(5, result[0]?._Value);
        Assert.Equal(0, result[1]?._Value);
        Assert.Equal(10, result[2]?._Value);
    }

    [Fact]
    public void Sqrt_List_ShouldReturnCorrectList()
    {
        // Arrange
        var source = new List<Length> { new(1), new(4), new(9) };

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

        // Assert
        Assert.Equal(3, result.Count);
        Assert.Equal(1, result[0]._Value);
        Assert.Equal(2, result[1]._Value);
        Assert.Equal(3, result[2]._Value);
    }

    [Fact]
    public void Sqrt_DestinationTooShort_ShouldThrowArgumentException()
    {
        // Arrange
        Length[] source = [new(4), new(9)];
        Length[] dest = new Length[1]; // Слишком мало

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

    [Fact]
    public void Sqrt_IEnumerable_ShouldWorkWithGenericCollection()
    {
        // Arrange
        IEnumerable<Length> source = new HashSet<Length> { new(16), new(64) };

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

        // Assert
        Assert.Contains(result, x => x._Value == 4);
        Assert.Contains(result, x => x._Value == 8);
    }
}