def test_next(self):
#
# New HalfEdge
#
v1 = Vertex((0,0))
v2 = Vertex((2,2))
v3 = Vertex((3,4))
next_half_edge = HalfEdge(v1, v2)
half_edge = HalfEdge(v3, v1, nxt=next_half_edge)
# Check
self.assertEqual(half_edge.next(),next_half_edge,\
'Next HalfEdge incorrect.')
def test_assign_next(self):
#
# New HalfEdge
#
v1 = Vertex((0,0))
v2 = Vertex((2,2))
v3 = Vertex((3,4))
h = HalfEdge(v1, v2)
#
# Incompatible next half_edge
#
bad_h_next = HalfEdge(v1, v3)
self.assertRaises(Exception, h.assign_next, (bad_h_next))
#
# Assign good next half-edge
#
good_h_next = HalfEdge(v2, v3)
h.assign_next(good_h_next)
# Check
self.assertEqual(h.next(),good_h_next,\
'Next HalfEdge incorrect.')
self.assertEqual(h.head(), h.next().base(), \
'Bases and heads should align.')
