"name 'Scene' is not defined" error when trying to run the manim tests scenes.

when typing

"manim teste.py TestScene -pl"

it gives me this error

Traceback (most recent call last):
File "C:\Users\user\AppData\Local\Programs\Python\Python38\Scripts\manim-script.py", line 33, in
sys.exit(load_entry_point('manimlib==0.2.0', 'console_scripts', 'manim')())
File "C:\Users\user\AppData\Local\Programs\Python\Python38\lib\site-packages\manimlib\__init__.py", line 9, in main
config = manimlib.config.get_configuration(args)
File "C:\Users\user\AppData\Local\Programs\Python\Python38\lib\site-packages\manimlib\config.py", line 155, in get_configuration
module = get_module(args.file)
File "C:\Users\user\AppData\Local\Programs\Python\Python38\lib\site-packages\manimlib\config.py", line 150, in get_module
spec.loader.exec_module(module)
File "", line 848, in exec_module
File "", line 219, in _call_with_frames_removed
File "C:\Users\user\Desktop\teste.py", line 1, in
class TestScene(Scene):
NameError: name 'Scene' is not defined

it is my second day of attempts, I'm on windows 10, everything else is installed correctly