def testFirst(self):
envs = Environments()
self.assertIsNone(envs.first())
envs.add(envs.new(), persist=False)
first = envs._items[0]
self.assertEqual(envs.first(), first)
def testAdd(self):
envs = Environments()
before_count = len(envs.all())
self.assertTrue(envs.add(envs.new(), persist=False))
after_count = len(envs.all())
self.assertGreater(after_count, before_count)
self.assertEqual(before_count + 1, after_count)
