def test_has_node():
from simple_graph import SimpleGraph
new_graph = SimpleGraph()
new_graph.graph = {'A': {'A': 15}}
assert new_graph.has_node('A') is True
assert new_graph.has_node('B') is False
def test_has_node_doesnt_exist():
from simple_graph import SimpleGraph
instance = SimpleGraph()
assert instance.has_node("waffles") is False
def test_sg_has_node_false():
"""Ensure has_node returns false when called with node not in graph."""
from simple_graph import SimpleGraph
test_sg = SimpleGraph()
assert test_sg.has_node("a") is False
def test_has_node():
from simple_graph import SimpleGraph
instance = SimpleGraph()
instance.add_node("waffles")
assert instance.has_node("waffles")
def test_sg_has_node_true():
"""Ensure has_node returns true when called with node in graph."""
from simple_graph import SimpleGraph
test_sg = SimpleGraph()
test_sg.add_node("a")
assert test_sg.has_node("a") is True
