def test_get_direction_of_vertex_pair_down_left(self):
"""Ensures correct output from _get_direction_of_vertex_pair.
In this case the direction is down-left.
"""
this_direction = polygons._get_direction_of_vertex_pair(
FIRST_VERTEX_ROW, SECOND_VERTEX_ROW_DOWN_LEFT, FIRST_VERTEX_COLUMN,
SECOND_VERTEX_COLUMN_DOWN_LEFT)
self.assertTrue(this_direction == polygons.DOWN_LEFT_DIRECTION_NAME)
def test_get_direction_of_vertex_pair_up_right(self):
"""Ensures correct output from _get_direction_of_vertex_pair.
In this case the direction is up-right.
"""
this_direction = polygons._get_direction_of_vertex_pair(
FIRST_VERTEX_ROW, SECOND_VERTEX_ROW_UP_RIGHT, FIRST_VERTEX_COLUMN,
SECOND_VERTEX_COLUMN_UP_RIGHT)
self.assertTrue(this_direction == polygons.UP_RIGHT_DIRECTION_NAME)