def test_env_get_defaults():
"""Verify the rather complex rules for env.get("<envvar>",default) value when envvar is not defined."""
env = Env(TEST1=0)
env.register("TEST_REG", default="abc")
env.register("TEST_REG_DNG", default=DefaultNotGiven)
# var is defined, registered is don't-care => value is defined value
assert env.get("TEST1", 22) == 0
# var not defined, not registered => value is immediate default
assert env.get("TEST2", 22) == 22
assert "TEST2" not in env
# var not defined, is registered, reg default is not sentinel => value is *registered* default
assert env.get("TEST_REG", 22) == "abc"
assert "TEST_REG" in env
# var not defined, is registered, reg default is sentinel => value is *immediate* default
assert env.get("TEST_REG_DNG", 22) == 22
assert "TEST_REG_DNG" not in env
