def test_matrix_hfind(): m, n = 3, 3 matrix = Matrix(m, n) matrix.colorize(0, 0, 'X') matrix.colorize(0, 2, 'X') matrix.colorize(1, 2, 'X') assert 0 in matrix.hfind(0, 'X') assert 0 in matrix.hfind(2, 'X') assert 1 in matrix.hfind(2, 'X')