def test_limit(self):
"""
Test calculating the limit.
"""
viz = Population(drawable.Drawable)
self.assertEqual((-0.75, -0.25), viz._limit(0.5))
def test_limit_height_one(self):
"""
Test that when drawing with a population height of 1, the function accepts it.
"""
viz = Population(drawable.Drawable)
self.assertTrue(viz._limit(1))
def test_limit_order(self):
"""
Test that the limit is a tuple in ascending order.
"""
viz = Population(drawable.Drawable)
limit = viz._limit(0.5)
self.assertEqual(tuple, type(limit))
self.assertLess(limit[0], limit[1])