using NUnit.Framework;

namespace Chernobyl.Utility
{
    [TestFixture, Description("Tests for the ComparableExtensions type.")]
    public class ComparableExtensionsTests
    {
        [Test, Description("A test that ensures the ComparableExtensions.Clamp<T>(T, T, T) " + 
            "method can clamp to the minimum value.")]
        public void ClampToMin()
        {
            float x = -0.1f;
            x = x.Clamp(0, 1);
            Assert.AreEqual(0f, x, "The value was not clamped to the minimum value.");
        }

        [Test, Description("A test that ensures the ComparableExtensions.Clamp<T>(T, T, T) " +
            "method does not clamp when it is not necessary.")]
        public void NoClamp()
        {
            const float expected = 0.5f;
            float x = expected.Clamp(0, 1);
            Assert.AreEqual(expected, x, "The value was modified when it should not have been.");
        }

        [Test, Description("A test that ensures the ComparableExtensions.Clamp<T>(T, T, T) " +
            "method can clamp to the maximum value.")]
        public void ClampToMax()
        {
            float x = 1.1f;
            x = x.Clamp(0, 1);
            Assert.AreEqual(1f, x, "The value was not clamped to the maximum value.");
        }
    }
}