using VoxelEngine.World.WorldGen;
using Xunit;

namespace VoxelEngine.Tests.WorldGen;

public class NoiseSourceTests
{
    [Fact]
    public void SameSeed_SameCoord_IsDeterministic()
    {
        var a = new NoiseSource(42);
        var b = new NoiseSource(42);
        Assert.Equal(a.Continent(10f, 20f), b.Continent(10f, 20f));
        Assert.Equal(a.Temperature(10f, 20f), b.Temperature(10f, 20f));
    }

    [Fact]
    public void Output_InMinusOneToOneRange()
    {
        var n = new NoiseSource(7);
        for (int i = 0; i < 200; i++)
        {
            float c = n.Continent(i * 3.1f, i * 1.7f);
            float t = n.Temperature(i * 2.3f, i * 0.9f);
            Assert.InRange(c, -1.001f, 1.001f);
            Assert.InRange(t, -1.001f, 1.001f);
        }
    }
}