def test_burn__burnable_calls_add_erosion(mocker):
    mocker.patch('components.material.MaterialComponent.add_erosion')
    m = MaterialComponent('WOOD', 'BURN')
    m.burn()
    m.add_erosion.assert_called_once()
def test_burn__nonburnable_returns_False():
    m = MaterialComponent('IRON', 'RUST')
    assert m.burn() is False
def test_burn__burnable_returns_True():
    m = MaterialComponent('WOOD', 'BURN')
    assert m.burn()