#if !UNITY_5_6_OR_NEWER
using NUnit.Framework;

namespace LinearAlgebra.Test {
    using Vector3 = Vector3Float;

    public class Vector3FloatTest {

        [Test]
        public void FromSpherical() {
            Vector3 v = new(0, 0, 1);
            Spherical s = Spherical.FromVector3(v);
            Vector3 r = Vector3.FromSpherical(s);

            Assert.AreEqual(0, r.horizontal, "0 0 1");
            Assert.AreEqual(0, r.vertical, 1.0e-06, "0 0 1");
            Assert.AreEqual(1, r.depth, "0 0 1");

            v = new(0, 1, 0);
            s = Spherical.FromVector3(v);
            r = Vector3.FromSpherical(s);
            Assert.AreEqual(0, r.horizontal, "0 0 1");
            Assert.AreEqual(1, r.vertical, "0 0 1");
            Assert.AreEqual(0, r.depth, 1.0e-06, "0 0 1");

            v = new(1, 0, 0);
            s = Spherical.FromVector3(v);
            r = Vector3.FromSpherical(s);
            Assert.AreEqual(1, r.horizontal, "0 0 1");
            Assert.AreEqual(0, r.vertical, 1.0e-06, "0 0 1");
            Assert.AreEqual(0, r.depth, 1.0e-06, "0 0 1");
        }

        [Test]
        public void Magnitude() {
            Vector3 v = new(1, 2, 3);
            float m = 0;

            m = v.magnitude;
            Assert.AreEqual(3.7416575f, m, "magnitude 1 2 3");

            m = Vector3.MagnitudeOf(v);
            Assert.AreEqual(3.7416575f, m, "MagnitudeOf 1 2 3");

            v = new(-1, -2, -3);
            m = v.magnitude;
            Assert.AreEqual(3.7416575f, m, "magnitude -1 -2 -3");

            v = new(0, 0, 0);
            m = v.magnitude;
            Assert.AreEqual(0, m, "magnitude 0 0 0");

            // Infinity tests are still missing
        }

        [Test]
        public void SqrMagnitude() {
            Vector3 v = new(1, 2, 3);
            float m = 0;

            m = v.sqrMagnitude;
            Assert.AreEqual(14, m, "sqrMagnitude 1 2 3");

            m = Vector3.SqrMagnitudeOf(v);
            Assert.AreEqual(14, m, "SqrMagnitudeOf 1 2 3");

            v = new(-1, -2, -3);
            m = v.sqrMagnitude;
            Assert.AreEqual(14, m, "sqrMagnitude -1 -2 -3");

            v = new(0, 0, 0);
            m = v.sqrMagnitude;
            Assert.AreEqual(0, m, "sqrMagnitude 0 0 0");

            // Infinity tests are still missing
        }

        [Test]
        public void Normalize() {
            Vector3 v = new(0, 2, 0);
            Vector3 r;

            r = v.normalized;
            Assert.AreEqual(new Vector3(0, 1, 0), r, "normalized 0 2 0");

            r = Vector3.Normalize(v);
            Assert.AreEqual(new Vector3(0, 1, 0), r, "Normalize 0 2 0");

            v = new(0, -2, 0);
            r = v.normalized;
            Assert.AreEqual(new Vector3(0, -1, 0), r, "normalized 0 -2 0");
            v = new(0, 0, 0);
            r = v.normalized;
            Assert.AreEqual(new Vector3(0, 0, 0), r, "normalized 0 0 0");

            v = new(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity);
            r = v.normalized;
            Assert.IsTrue(float.IsNaN(r.horizontal), "normalized infinity infinity infinity");
            Assert.IsTrue(float.IsNaN(r.vertical), "normalized infinity infinity infinity");
            Assert.IsTrue(float.IsNaN(r.depth), "normalized infinity infinity infinity");

            v = new(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity);
            r = v.normalized;
            Assert.IsTrue(float.IsNaN(r.horizontal), "normalized -infinity -infinity -infinity");
            Assert.IsTrue(float.IsNaN(r.vertical), "normalized -infinity -infinity -infinity");
            Assert.IsTrue(float.IsNaN(r.depth), "normalized -infinity -infinity -infinity");
        }

        [Test]
        public void Negate() {
            Vector3 v = new(4, 5, 6);
            Vector3 r;

            r = -v;
            Assert.AreEqual(-4, r.horizontal, "- 4 5 6 H");
            Assert.AreEqual(-5, r.vertical, "- 4 5 6 V");
            Assert.AreEqual(-6, r.depth, "- 4 5 6 D");

            v = new(-4, -5, -6);
            r = -v;
            Assert.AreEqual(4, r.horizontal, "- -4 -5 -6 H");
            Assert.AreEqual(5, r.vertical, "- -4 -5 -6 V");
            Assert.AreEqual(6, r.depth, "- -4 -5 -6 D");

            v = new(0, 0, 0);
            r = -v;
            Assert.AreEqual(new Vector3(0, 0, 0), r, "- 0 0 0");
            Assert.AreEqual(0, r.horizontal, "- 0 0 0 H");
            Assert.AreEqual(0, r.vertical, "- 0 0 0 V");
            Assert.AreEqual(0, r.depth, "- 0 0 0 D");


            v = new(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity);
            r = -v;
            Assert.AreEqual(new Vector3(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity), r, "- inifinty infinity infinity");

            v = new(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity);
            r = -v;
            Assert.AreEqual(new Vector3(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity), r, "- -inifinty -infinity -infinity");
        }

        [Test]
        public void Subtract() {
            Vector3 v1 = new(4, 5, 6);
            Vector3 v2 = new(1, 2, 3);
            Vector3 r = Vector3.zero;

            r = v1 - v2;
            Assert.IsTrue(r == new Vector3(3, 3, 3), "4 5 6 - 1 2 3");

            v2 = new(-1, -2, -3);
            r = v1 - v2;
            Assert.IsTrue(r == new Vector3(5, 7, 9), "4 5 6 - -1 -2 -3");

            v2 = new(4, 5, 6);
            r = v1 - v2;
            Assert.IsTrue(r == new Vector3(0, 0, 0), "4 5 6 - 4 5 6");
            r = v1;
            r -= v2;
            Assert.AreEqual(r, new Vector3(0, 0, 0), "4 5 6 - 4 5 6");

            v2 = new(0, 0, 0);
            r = v1 - v2;
            Assert.AreEqual(r, new Vector3(4, 5, 6), "4 5 6 - 0 0 0");
            r -= v2;
            Assert.AreEqual(r, new Vector3(4, 5, 6), "4 5 6 - 0 0 0");

            // Infinity tests are still missing
        }

        [Test]
        public void Addition() {
            Vector3 v1 = new(4, 5, 6);
            Vector3 v2 = new(1, 2, 3);
            Vector3 r = Vector3.zero;

            r = v1 + v2;
            Assert.IsTrue(r == new Vector3(5, 7, 9), "4 5 6 + 1 2 3");

            v2 = new(-1, -2, -3);
            r = v1 + v2;
            Assert.IsTrue(r == new Vector3(3, 3, 3), "4 5 6 + -1 -2 -3");
            r = v1;
            r += v2;
            Assert.AreEqual(r, new Vector3(3, 3, 3), "4 5 6 + -1 -2 -3");

            v2 = new(0, 0, 0);
            r = v1 + v2;
            Assert.AreEqual(r, new Vector3(4, 5, 6), "4 5 6 + 0 0 0");
            r += v2;
            Assert.AreEqual(r, new Vector3(4, 5, 6), "4 5 6 + 0 0 0");

            // Infinity tests are still missing
        }

        [Test]
        public void Scale() {
            Vector3 v1 = new(4, 5, 6);
            Vector3 v2 = new(1, 2, 3);
            Vector3 r;

            r = Vector3.Scale(v1, v2);
            Assert.AreEqual(4, r.horizontal, "Scale 4 5 6 , 1 2 3  H");
            Assert.AreEqual(10, r.vertical, "Scale 4 5 6 , 1 2 3  V");
            Assert.AreEqual(18, r.depth, "Scale 4 5 6 , 1 2 3  D");

            v2 = new(-1, -2, -3);
            r = Vector3.Scale(v1, v2);
            Assert.AreEqual(-4, r.horizontal, "Scale 4 5 6 , -1 -2 -3  H");
            Assert.AreEqual(-10, r.vertical, "Scale 4 5 6 , -1 -2 -3  V");
            Assert.AreEqual(-18, r.depth, "Scale 4 5 6 , -1 -2 -3  D");

            v2 = new(0, 0, 0);
            r = Vector3.Scale(v1, v2);
            Assert.AreEqual(0, r.horizontal, "Scale 4 5 6 , 0 0 0  H");
            Assert.AreEqual(0, r.vertical, "Scale 4 5 6 , 0 0 0  V");
            Assert.AreEqual(0, r.depth, "Scale 4 5 6 , 0 0 0  D");

            v2 = new(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity);
            r = Vector3.Scale(v1, v2);
            Assert.AreEqual(float.PositiveInfinity, r.horizontal, "Scale 4 5 6 , inf inf inf H");
            Assert.AreEqual(float.PositiveInfinity, r.vertical, "Scale 4 5 6 , inf inf inf  V");
            Assert.AreEqual(float.PositiveInfinity, r.depth, "Scale 4 5 6 , inf inf inf  D");

            v2 = new(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity);
            r = Vector3.Scale(v1, v2);
            Assert.AreEqual(float.NegativeInfinity, r.horizontal, "Scale 4 5 6 , -inf -inf -inf H");
            Assert.AreEqual(float.NegativeInfinity, r.vertical, "Scale 4 5 6 , -inf -inf -inf  V");
            Assert.AreEqual(float.NegativeInfinity, r.depth, "Scale 4 5 6 , -inf -inf -inf  D");
        }

        [Test]
        public void Multiply() {
            Vector3 v1 = new(4, 5, 6);
            float f = 3;
            Vector3 r;

            r = v1 * f;
            Assert.AreEqual(12, r.horizontal, "4 5 6 * 3  H");
            Assert.AreEqual(15, r.vertical, "4 5 6 * 3  V");
            Assert.AreEqual(18, r.depth, "4 5 6 * 3  D");

            f = -3;
            r = v1 * f;
            Assert.AreEqual(-12, r.horizontal, "4 5 6 * -3  H");
            Assert.AreEqual(-15, r.vertical, "4 5 6 * -3  V");
            Assert.AreEqual(-18, r.depth, "4 5 6 * -3  D");

            f = 0;
            r = v1 * f;
            Assert.AreEqual(0, r.horizontal, "4 5 6 * 0  H");
            Assert.AreEqual(0, r.vertical, "4 5 6 * 0  V");
            Assert.AreEqual(0, r.depth, "4 5 6 * 0  D");

            f = float.PositiveInfinity;
            r = v1 * f;
            Assert.AreEqual(float.PositiveInfinity, r.horizontal, "4 5 6 * inf  H");
            Assert.AreEqual(float.PositiveInfinity, r.vertical, "4 5 6 * inf  V");
            Assert.AreEqual(float.PositiveInfinity, r.depth, "4 5 6 * inf  D");

            f = float.NegativeInfinity;
            r = v1 * f;
            Assert.AreEqual(float.NegativeInfinity, r.horizontal, "4 5 6 * -inf  H");
            Assert.AreEqual(float.NegativeInfinity, r.vertical, "4 5 6 * -inf  V");
            Assert.AreEqual(float.NegativeInfinity, r.depth, "4 5 6 * -inf  D");
        }

        [Test]
        public void Divide() {
            Vector3 v1 = new(4, 5, 6);
            float f = 2;
            Vector3 r;

            r = v1 / f;
            Assert.AreEqual(2, r.horizontal, "4 5 6 / 2  H");
            Assert.AreEqual(2.5, r.vertical, "4 5 6 / 2  V");
            Assert.AreEqual(3, r.depth, "4 5 6 / 2  D");

            f = -2;
            r = v1 / f;
            Assert.AreEqual(-2, r.horizontal, "4 5 6 / -2 H");
            Assert.AreEqual(-2.5, r.vertical, "4 5 6 / -2  V");
            Assert.AreEqual(-3, r.depth, "4 5 6 / -2  D");

            f = 0;
            r = v1 / f;
            Assert.AreEqual(float.PositiveInfinity, r.horizontal, "4 5 6 / 0  H");
            Assert.AreEqual(float.PositiveInfinity, r.vertical, "4 5 6 / 0  V");
            Assert.AreEqual(float.PositiveInfinity, r.depth, "4 5 6 / 0  D");

            f = float.PositiveInfinity;
            r = v1 / f;
            Assert.AreEqual(0, r.horizontal, "4 5 6 / inf  H");
            Assert.AreEqual(0, r.vertical, "4 5 6 / inf  V");
            Assert.AreEqual(0, r.depth, "4 5 6 / inf  D");

            f = float.NegativeInfinity;
            r = v1 / f;
            Assert.AreEqual(0, r.horizontal, "4 5 6 / -inf  H");
            Assert.AreEqual(0, r.vertical, "4 5 6 / -inf  V");
            Assert.AreEqual(0, r.depth, "4 5 6 / -inf  D");
        }

        [Test]
        public void Dot() {
            Vector3 v1 = new(4, 5, 6);
            Vector3 v2 = new(1, 2, 3);
            float f;

            f = Vector3.Dot(v1, v2);
            Assert.AreEqual(32, f, "Dot(4 5 6, 1 2 3)");

            v2 = new(-1, -2, -3);
            f = Vector3.Dot(v1, v2);
            Assert.AreEqual(-32, f, "Dot(4 5 6, -1 -2 -3)");

            v2 = new(0, 0, 0);
            f = Vector3.Dot(v1, v2);
            Assert.AreEqual(0, f, "Dot(4 5 6, 0 0 0)");

            v2 = new(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity);
            f = Vector3.Dot(v1, v2);
            Assert.AreEqual(float.PositiveInfinity, f, "Dot(4 5 6, inf inf inf)");

            v2 = new(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity);
            f = Vector3.Dot(v1, v2);
            Assert.AreEqual(float.NegativeInfinity, f, "Dot(4 5 6, -inf -inf -inf)");
        }

        [Test]
        public void Equality() {
            Vector3 v1 = new(4, 5, 6);
            Vector3 v2 = new(1, 2, 3);
            bool r;

            r = v1 == v2;
            Assert.IsFalse(r, "4 5 6 == 1 2 3");

            v2 = new(4, 5, 6);
            r = v1 == v2;
            Assert.IsTrue(r, "4 5 6 == 4 5 6");

            v2 = new(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity);
            r = v1 == v2;
            Assert.IsFalse(r, "4 5 6 == inf inf inf");

            v1 = new(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity);
            r = v1 == v2;
            Assert.IsFalse(r, "-inf -inf -inf == inf inf inf");
        }

        [Test]
        public void Distance() {
            Vector3 v1 = new(4, 5, 6);
            Vector3 v2 = new(1, 2, 3);
            float f;

            f = Vector3.Distance(v1, v2);
            Assert.AreEqual(5.19615221F, f, "Distance(4 5 6, 1 2 3)");

            v2 = new(-1, -2, -3);
            f = Vector3.Distance(v1, v2);
            Assert.AreEqual(12.4498997F, f, "Distance(4 5 6, -1 -2 -3)");

            v2 = new(0, 0, 0);
            f = Vector3.Distance(v1, v2);
            Assert.AreEqual(v1.magnitude, f, "Distance(4 5 6, 0 0 0)");

            v2 = new(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity);
            f = Vector3.Distance(v1, v2);
            Assert.AreEqual(float.PositiveInfinity, f, "Distance(4 5 6, inf inf inf)");

            v2 = new(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity);
            f = Vector3.Distance(v1, v2);
            Assert.AreEqual(float.PositiveInfinity, f, "Distance(4 5 6, -inf -inf -inf)");
        }

        [Test]
        public void Cross() {
            Vector3 v1 = new(4, 5, 6);
            Vector3 v2 = new(1, 2, 3);
            Vector3 r;

            r = Vector3.Cross(v1, v2);
            Assert.AreEqual(3, r.horizontal, "Cross(4 5 6, 1 2 3) H");
            Assert.AreEqual(-6, r.vertical, "Cross(4 5 6, 1 2 3)  V");
            Assert.AreEqual(3, r.depth, "Cross(4 5 6, 1 2 3)  D");

            v2 = new(-1, -2, -3);
            r = Vector3.Cross(v1, v2);
            Assert.AreEqual(-3, r.horizontal, "Cross(4 5 6, -1 -2 -3) H");
            Assert.AreEqual(6, r.vertical, "Cross(4 5 6, -1 -2 -3)  V");
            Assert.AreEqual(-3, r.depth, "Cross(4 5 6, -1 -2 -3)  D");

            v2 = new(0, 0, 0);
            r = Vector3.Cross(v1, v2);
            Assert.AreEqual(0, r.horizontal, "Cross(4 5 6, 0 0 0) H");
            Assert.AreEqual(0, r.vertical, "Cross(4 5 6, 0 0 0)  V");
            Assert.AreEqual(0, r.depth, "Cross(4 5 6, 0 0 0)  D");

            v2 = new(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity);
            r = Vector3.Cross(v1, v2);
            Assert.IsTrue(float.IsNaN(r.horizontal), "Cross(4 5 6, inf inf inf) H");
            Assert.IsTrue(float.IsNaN(r.vertical), "Cross(4 5 6, inf inf inf)  V");
            Assert.IsTrue(float.IsNaN(r.depth), "Cross(4 5 6, inf inf inf)  D");

            v2 = new(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity);
            r = Vector3.Cross(v1, v2);
            Assert.IsTrue(float.IsNaN(r.horizontal), "Cross(4 5 6, -inf -inf -inf) H");
            Assert.IsTrue(float.IsNaN(r.vertical), "Cross(4 5 6, -inf -inf -inf)  V");
            Assert.IsTrue(float.IsNaN(r.depth), "Cross(4 5 6, -inf -inf -inf)  D");
        }

        [Test]
        public void Project() {
            Vector3 v1 = new(4, 5, 6);
            Vector3 v2 = new(1, 2, 3);
            Vector3 r;

            r = Vector3.Project(v1, v2);
            Assert.AreEqual(2.28571439F, r.horizontal, "Project(4 5 6, 1 2 3) H");
            Assert.AreEqual(4.57142878F, r.vertical, "Project(4 5 6, 1 2 3)  V");
            Assert.AreEqual(6.85714293F, r.depth, "Project(4 5 6, 1 2 3)  D");

            v2 = new(-1, -2, -3);
            r = Vector3.Project(v1, v2);
            Assert.AreEqual(2.28571439F, r.horizontal, "Project(4 5 6, -1 -2 -3) H");
            Assert.AreEqual(4.57142878F, r.vertical, "Project(4 5 6, -1 -2 -3)  V");
            Assert.AreEqual(6.85714293F, r.depth, "Project(4 5 6, -1 -2 -3)  D");

            v2 = new(0, 0, 0);
            r = Vector3.Project(v1, v2);
            Assert.AreEqual(0, r.horizontal, "Project(4 5 6, 0 0 0) H");
            Assert.AreEqual(0, r.vertical, "Project(4 5 6, 0 0 0)  V");
            Assert.AreEqual(0, r.depth, "Project(4 5 6, 0 0 0)  D");

            r = Vector3.Project(v2, v1);
            Assert.AreEqual(0, r.horizontal, "Project(0 0 0, 4 5 6) H");
            Assert.AreEqual(0, r.vertical, "Project(0 0 0, 4 5 6)  V");
            Assert.AreEqual(0, r.depth, "Project(0 0 0, 4 5 6)  D");

            v2 = new(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity);
            r = Vector3.Project(v1, v2);
            Assert.IsTrue(float.IsNaN(r.horizontal), "Project(4 5 6, inf inf inf) H");
            Assert.IsTrue(float.IsNaN(r.vertical), "Project(4 5 6, inf inf inf)  V");
            Assert.IsTrue(float.IsNaN(r.depth), "Project(4 5 6, inf inf inf)  D");

            v2 = new(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity);
            r = Vector3.Project(v1, v2);
            Assert.IsTrue(float.IsNaN(r.horizontal), "Project(4 5 6, -inf -inf -inf) H");
            Assert.IsTrue(float.IsNaN(r.vertical), "Project(4 5 6, -inf -inf -inf)  V");
            Assert.IsTrue(float.IsNaN(r.depth), "Project(4 5 6, -inf -inf -inf)  D");
        }

        [Test]
        public void ProjectOnPlane() {
            Vector3 v1 = new(4, 5, 6);
            Vector3 v2 = new(1, 2, 3);
            Vector3 r;

            r = Vector3.ProjectOnPlane(v1, v2);
            Assert.AreEqual(1.71428561F, r.horizontal, "ProjectOnPlane(4 5 6, 1 2 3) H");
            Assert.AreEqual(0.428571224F, r.vertical, "ProjectOnPlane(4 5 6, 1 2 3)  V");
            Assert.AreEqual(-0.857142925F, r.depth, "ProjectOnPlane(4 5 6, 1 2 3)  D");

            v2 = new(-1, -2, -3);
            r = Vector3.ProjectOnPlane(v1, v2);
            Assert.AreEqual(1.71428561F, r.horizontal, "ProjectOnPlane(4 5 6, -1 -2 -3) H");
            Assert.AreEqual(0.428571224F, r.vertical, "ProjectOnPlane(4 5 6, -1 -2 -3)  V");
            Assert.AreEqual(-0.857142925F, r.depth, "ProjectOnPlane(4 5 6, -1 -2 -3)  D");

            v2 = new(0, 0, 0);
            r = Vector3.ProjectOnPlane(v1, v2);
            Assert.AreEqual(4, r.horizontal, "ProjectOnPlane(4 5 6, 0 0 0) H");
            Assert.AreEqual(5, r.vertical, "ProjectOnPlane(4 5 6, 0 0 0)  V");
            Assert.AreEqual(6, r.depth, "ProjectOnPlane(4 5 6, 0 0 0)  D");

            r = Vector3.ProjectOnPlane(v2, v1);
            Assert.AreEqual(0, r.horizontal, "ProjectOnPlane(0 0 0, 4 5 6) H");
            Assert.AreEqual(0, r.vertical, "ProjectOnPlane(0 0 0, 4 5 6)  V");
            Assert.AreEqual(0, r.depth, "ProjectOnPlane(0 0 0, 4 5 6)  D");

            v2 = new(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity);
            r = Vector3.ProjectOnPlane(v1, v2);
            Assert.IsTrue(float.IsNaN(r.horizontal), "ProjectOnPlane(4 5 6, inf inf inf) H");
            Assert.IsTrue(float.IsNaN(r.vertical), "ProjectOnPlane(4 5 6, inf inf inf)  V");
            Assert.IsTrue(float.IsNaN(r.depth), "ProjectOnPlane(4 5 6, inf inf inf)  D");

            v2 = new(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity);
            r = Vector3.ProjectOnPlane(v1, v2);
            Assert.IsTrue(float.IsNaN(r.horizontal), "ProjectOnPlane(4 5 6, -inf -inf -inf) H");
            Assert.IsTrue(float.IsNaN(r.vertical), "ProjectOnPlane(4 5 6, -inf -inf -inf)  V");
            Assert.IsTrue(float.IsNaN(r.depth), "ProjectOnPlane(4 5 6, -inf -inf -inf)  D");
        }

        [Test]
        public void UnsignedAngle() {
            Vector3 v1 = new(4, 5, 6);
            Vector3 v2 = new(1, 2, 3);
            AngleFloat a;

            a = Vector3.UnsignedAngle(v1, v2);
            Assert.AreEqual(12.9331379F, a.inDegrees, "Angle(4 5 6, 1 2 3)");

            v2 = new(-1, -2, -3);
            a = Vector3.UnsignedAngle(v1, v2);
            Assert.AreEqual(167.066849F, a.inDegrees, "Angle(4 5 6, -1 -2 -3)");

            v2 = new(0, 0, 0);
            a = Vector3.UnsignedAngle(v1, v2);
            Assert.AreEqual(0, a.inDegrees, "Angle(4 5 6, 0 0 0)");

            v2 = new(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity);
            a = Vector3.UnsignedAngle(v1, v2);
            Assert.IsTrue(float.IsNaN(a.inDegrees), "Angle(4 5 6, inf inf inf)");

            v2 = new(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity);
            a = Vector3.UnsignedAngle(v1, v2);
            Assert.IsTrue(float.IsNaN(a.inDegrees), "Angle(4 5 6, inf inf inf)");
        }

        [Test]
        public void SignedAngle() {
            Vector3 v1 = new(4, 5, 6);
            Vector3 v2 = new(1, 2, 3);
            Vector3 v3 = new(7, 8, -9);
            AngleFloat a;

            a = Vector3.SignedAngle(v1, v2, v3);
            Assert.AreEqual(-12.9331379F, a.inDegrees, "SignedAngle(4 5 6, 1 2 3, 7 8 -9)");

            v2 = new(-1, -2, -3);
            a = Vector3.SignedAngle(v1, v2, v3);
            Assert.AreEqual(167.066849F, a.inDegrees, "SignedAngle(4 5 6, -1 -2 -3, 7 8 -9)");

            v2 = new(0, 0, 0);
            a = Vector3.SignedAngle(v1, v2, v3);
            Assert.AreEqual(0, a.inDegrees, "SignedAngle(4 5 6, 0 0 0, 7 8 -9)");

            v2 = new(1, 2, 3);
            v3 = new(-7, -8, 9);
            a = Vector3.SignedAngle(v1, v2, v3);
            Assert.AreEqual(12.9331379F, a.inDegrees, "SignedAngle(4 5 6, 1 2 3, -7 -8 9)");

            v3 = new(0, 0, 0);
            a = Vector3.SignedAngle(v1, v2, v3);
            Assert.AreEqual(0, a.inDegrees, "SignedAngle(4 5 6, 1 2 3, 0 0 0)");

            v2 = new(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity);
            a = Vector3.SignedAngle(v1, v2, v3);
            Assert.IsTrue(float.IsNaN(a.inDegrees), "SignedAngle(4 5 6, inf inf inf, 0 0 0)");

            v2 = new(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity);
            a = Vector3.SignedAngle(v1, v2, v3);
            Assert.IsTrue(float.IsNaN(a.inDegrees), "SignedAngle(4 5 6, -inf -inf -inf, 0 0 0)");
        }

        [Test]
        public void Lerp() {
            Vector3 v1 = new(4, 5, 6);
            Vector3 v2 = new(1, 2, 3);
            Vector3 r;

            r = Vector3.Lerp(v1, v2, 0);
            Assert.AreEqual(0, Vector3.Distance(r, v1), 0);

            r = Vector3.Lerp(v1, v2, 1);
            Assert.AreEqual(0, Vector3.Distance(r, v2), 0);

            r = Vector3.Lerp(v1, v2, 0.5f);
            Assert.AreEqual(0, Vector3.Distance(r, new Vector3(2.5f, 3.5f, 4.5f)), 0);

            r = Vector3.Lerp(v1, v2, -1);
            Assert.AreEqual(0, Vector3.Distance(r, new Vector3(7, 8, 9)), 0);

            r = Vector3.Lerp(v1, v2, 2);
            Assert.AreEqual(0, Vector3.Distance(r, new Vector3(-2, -1, 0)), 0);
        }
    }
}
#endif