def test_node_with_forward_diagonal_string_not_found():
string = "ABCDEFGHIIIKL"
node = Node(f=string)
assert node.count_mutant_genes() == 0
def test_node_with_backward_diagonal_string_found():
string = "AAGCCCCCCTTT"
node = Node(b=string)
assert node.count_mutant_genes() == 1
def test_node_with_vertical_string_not_found():
string = "ABCDEFGHIIIKL"
node = Node(v=string)
assert node.count_mutant_genes() == 0
def test_node_with_vertical_string_found():
string = "AAGCCCCCCTTT"
node = Node(h=string)
assert node.count_mutant_genes() == 1
def test_node_with_horizontal_string_long_enough_found():
string = "AAAA"
node = Node(h=string)
assert node.count_mutant_genes() == 1
def test_node_with_horizontal_string_too_short():
string = "AAA"
node = Node(h=string)
assert node.count_mutant_genes() == 0
def test_count_mutant_genes():
string = "AAGCCCCCCTTT"
node = Node(b=string, h=string, f=string, v=string)
assert node.count_mutant_genes() == 4