public void MatrixUtilities_Test()
        {
            var arr = MatrixTestsGenerator.GetTestArray();

            var result = MatrixUtilities.ToString(arr);

            Assert.AreEqual(result, @"1, 2, 3, 4, 5, 
6, 7, 8, 9, 10, 
11, 12, 13, 14, 15, 
16, 17, 18, 19, 20, 
21, 22, 23, 24, 25, 
");
        }