TriangleTests.cs

namespace Geometry.Tests {
    using NUnit.Framework;
    using static NUnit.Framework.Assert;

    [TestFixture]
    public class TriangleTests {
        [Test]
        public void Triangle_Area_OfSixBaseAndThreeHeight_IsNine_Test () {
            // Arrange
            const double @base = 6;
            const double height = 3;
            var triangle = new Triangle ();

            // Act
            var result = triangle.Area (@base, height);

            // Assert
            AreEqual (9.0d, result);
        }
    }
}