public void AddingMatrix()
 {
     double[,] a =
     {
         { 2, 3 },
         { 4, 2 }
     };
     double[,] pom =
     {
         { 4, 6 },
         { 8, 4 }
     };
     double[,] r = mo.AddMatrix(a, a);
     for (int i = 0; i < 2; i++)
     {
         for (int j = 0; j < 2; j++)
         {
             Assert.AreEqual(pom[i, j], r[i, j]);
         }
     }
 }