def test_default_attributes():
""" Test the default attributes when no environment variables are set. """
env = LightningEnvironment()
assert not env.creates_children()
assert env.master_address() == "127.0.0.1"
assert isinstance(env.master_port(), int)
assert env.world_size() == 1
assert env.local_rank() == 0
assert env.node_rank() == 0
def test_manual_user_launch(environ, creates_children):
""" Test that the environment switches to manual user mode when LOCAL_RANK env variable detected. """
with mock.patch.dict(os.environ, environ):
env = LightningEnvironment()
assert env.creates_children() == creates_children
