PLEASE HELP WHY IS THIS PYTHON CODE ERRORING?

class Graph:

"""

Represents a directed graph using an adjacency list

self.graph will be a dictionary containing each node in the graph as

a key with its value set to a list of all nodes adjacent to it

For example, if self.graph was { 1: [], 2: [3], 3: [1]}

Node 1 would have a path to no other node, Node 2 would have a

path to Node 3, and Node 3 would have a path to Node 1

"""

def __init__(self):

self.graph = {} # graph will initially be empty

def __repr__(self):

return str(self.graph)

def add_edge(self, node1, node2):

if node1 not in self.graph:

self.graph[node1] = []

self.graph[node1].append(node2)

def add_node(self, node1):

if node1 not in self.graph:

self.graph[node1] = []

def is_reachable(self,node1,visited, node_to_find):

# TODO: Complete this method so that it returns True if there is

# a path from node1 to node_to_find and False otherwise

if node1 in visited:

return False

visited.append(node1)

if node1 == node_to_find:

return True

if node1 not in self.graph:

return False

for neighbor in self.graph[node1]:

if self.is_reachable(neighbor, node_to_find, visited):

return True

return False

THESE ARE MY ERRORS

FAILED tests.py::test_traverse_recursively_is_recursive - TypeError: Node.traverse_recursively() missing 1 required positional argument: 'node' FAILED tests.py::test_traverse_recursively_prints_expected_output - TypeError: Node.traverse_recursively() missing 1 required positional argument: 'node' FAILED tests.py::test_traverse_recursively_prints_expected_one_node - TypeError: Node.traverse_recursively() missing 1 required positional argument: 'node' FAILED tests.py::test_is_reachable_adjacent_nodes - TypeError: Graph.is_reachable() missing 1 required positional argument: 'node_to_find' FAILED tests.py::test_is_reachable_one_direction_only - TypeError: Graph.is_reachable() missing 1 required positional argument: 'node_to_find' FAILED tests.py::test_is_reachable_multiple_steps - TypeError: Graph.is_reachable() missing 1 required positional argument: 'node_to_find' FAILED tests.py::test_is_reachable_cycle - TypeError: Graph.is_reachable() missing 1 required positional argument: 'node_to_find' FAILED tests.py::test_not_reachable - TypeError: Graph.is_reachable() missing 1 required positional argument: 'node_to_find'

THESE ARE MY TESTS

def setup_graph():

graph = Graph()

graph.add_edge(0, 1)

graph.add_edge(0, 2)

graph.add_edge(1, 2)

graph.add_edge(2, 0)

graph.add_edge(2, 3)

graph.add_node(5)

graph.add_edge(3, 5)

graph.add_node(4)

return graph

def test_is_reachable_adjacent_nodes():

graph = setup_graph()

assert graph.is_reachable(3, 5) is True

def test_is_reachable_one_direction_only():

graph = setup_graph()

assert graph.is_reachable(5, 3) is False

def test_is_reachable_multiple_steps():

graph = setup_graph()

assert graph.is_reachable(0, 5) is True

def test_is_reachable_cycle():

graph = setup_graph()

assert graph.is_reachable(3, 3) is True

def test_not_reachable():

graph = setup_graph()

assert graph.is_reachable(0, 4) is False