def test_previous(self):
#
# New HalfEdge
#
v1 = Vertex((0,0))
v2 = Vertex((2,2))
v3 = Vertex((3,4))
previous_half_edge = HalfEdge(v1, v2)
half_edge = HalfEdge(v2, v3, previous=previous_half_edge)
# Check
self.assertEqual(half_edge.previous(),previous_half_edge,\
'Previous HalfEdge incorrect.')
def test_assign_previous(self):
#
# New HalfEdge
#
v1 = Vertex((0,0))
v2 = Vertex((2,2))
v3 = Vertex((3,4))
h = HalfEdge(v1, v2)
#
# Incompatible previous half_edge
#
bad_h_prev = HalfEdge(v1, v3)
self.assertRaises(Exception, h.assign_previous, (bad_h_prev))
#
# Assign good next half-edge
#
good_h_previous = HalfEdge(v2, v1)
h.assign_previous(good_h_previous)
# Check
self.assertEqual(h.previous(),good_h_previous,\
'Next HalfEdge incorrect.')
self.assertEqual(h.base(), h.previous().head(), \
'Bases and heads should align.')
