public void CheckToString() { var matrix = new matrix("1 2 3;4 5 6;7 8 9"); string matrixAsString = matrix.ToString(); Assert.IsTrue(matrixAsString.Contains("matrix([[1, 2, 3]")); Assert.IsTrue(matrixAsString.Contains("[4, 5, 6]")); Assert.IsTrue(matrixAsString.Contains("[7, 8, 9]")); }