public void Tune_AlphaIsNotValid_ThrowsException()
        {
            var expected = 9.9;

            var tree = new ScapegoatTree <int>();

            Assert.Throws <ArgumentException>(() => tree.Tune(expected));
        }
        public void Tune_AlphaIsValid_ChangesAlpha()
        {
            var expected = 0.7;

            var tree = new ScapegoatTree <int>();

            tree.Tune(expected);

            Assert.AreEqual(expected, tree.Alpha);
        }