import unittest.mock as mock
import pytest
import os

from mlagents.trainers.demo_loader import load_demonstration, make_demo_buffer


def test_load_demo():
    path_prefix = os.path.dirname(os.path.abspath(__file__))
    brain_parameters, brain_infos, total_expected = load_demonstration(
        path_prefix + "/test.demo"
    )
    assert brain_parameters.brain_name == "Ball3DBrain"
    assert brain_parameters.vector_observation_space_size == 8
    assert len(brain_infos) == total_expected

    demo_buffer = make_demo_buffer(brain_infos, brain_parameters, 1)
    assert len(demo_buffer.update_buffer["actions"]) == total_expected - 1