def testPaths(self):
nodes = [ Node(read) for read in ["AAA", "AGG", "GTT", "TCA"]]
graph = Graph(nodes)
edge = Edge(1, nodes[0], nodes[1])
self.assertFalse(graph.will_create_cycle(edge))
nodes[0].out_edges.append(edge)
nodes[1].in_edges.append(edge)
other_edge = Edge(0, nodes[1], nodes[0])
self.assertTrue(graph.will_create_cycle(other_edge))
def testWillCycle(self):
reads = ["AAA", "AGG", "GTT"]
first_node = Node("AAA")
second_node = Node("AGG")
third_node = Node("GGT")
graph = Graph([first_node, second_node, third_node])
# add edges
fs_edge = Edge(0, first_node, second_node)
first_node.out_edges.append(fs_edge)
second_node.in_edges.append(fs_edge)
st_edge = Edge(0, second_node, third_node)
second_node.out_edges.append(st_edge)
third_node.in_edges.append(st_edge)
# cycle edge
tf_edge = Edge(0, third_node, first_node)
self.assertTrue(graph.will_create_cycle(tf_edge))
