Accord.Tests.Math.BinarySearchTest.ConstructorTest C# (CSharp) Method

        public void ConstructorTest()
        {
            // https://www.wolframalpha.com/input/?i=%28x%2B1%29+*+%28x%2B1%29+*+%28x%2B1%29+%2B+2+*+%28x%2B1%29+*+%28x%2B1%29+%3D+0%2C+x+is+integer

            Func<int, double> function = x => (x + 1) * (x + 1) * (x + 1) + 2 * (x + 1) * (x + 1);

            // Possible roots are -3 or -1

            BinarySearch search;
            search = new BinarySearch(function, -2, 3);
            double r1 = search.FindRoot();
            Assert.AreEqual(-1, r1);

            search = new BinarySearch(function, -10, -2);
            double r2 = search.FindRoot();
            Assert.AreEqual(-3, r2);
        }