How to use the watchmaker.utils.copytree function in watchmaker

def test_copytree_no_force(mock_copy, mock_rm, mock_exists):
    """Test that copytree results in correct calls without force option."""
    random_src = 'aba51e65-afd2-5020-8117-195f75e64258'
    random_dst = 'f74d03de-7c1d-596f-83f3-73748f2e238f'

    watchmaker.utils.copytree(random_src, random_dst)
    mock_copy.assert_called_with(random_src, random_dst)
    assert mock_rm.call_count == 0
    assert mock_exists.call_count == 0

    watchmaker.utils.copytree(random_src, random_dst, force=False)
    mock_copy.assert_called_with(random_src, random_dst)
    assert mock_rm.call_count == 0
    assert mock_exists.call_count == 0

def test_copytree_no_force(mock_copy, mock_rm, mock_exists):
    """Test that copytree results in correct calls without force option."""
    random_src = 'aba51e65-afd2-5020-8117-195f75e64258'
    random_dst = 'f74d03de-7c1d-596f-83f3-73748f2e238f'

    watchmaker.utils.copytree(random_src, random_dst)
    mock_copy.assert_called_with(random_src, random_dst)
    assert mock_rm.call_count == 0
    assert mock_exists.call_count == 0

    watchmaker.utils.copytree(random_src, random_dst, force=False)
    mock_copy.assert_called_with(random_src, random_dst)
    assert mock_rm.call_count == 0
    assert mock_exists.call_count == 0

def test_copytree_force(mock_copy, mock_rm, mock_exists):
    """Test that copytree results in correct calls with force option."""
    random_src = '44b6df59-db6f-57cb-a570-ccd55d782561'
    random_dst = '72fe7962-a7af-5f2f-899b-54798bc5e79f'

    watchmaker.utils.copytree(random_src, random_dst, force=True)
    mock_copy.assert_called_with(random_src, random_dst)
    mock_rm.assert_called_with(random_dst)
    mock_exists.assert_called_with(random_dst)

def _get_formulas_conf(self):

        # Append Salt formulas bundled with Watchmaker package.
        formulas_path = os.sep.join((static.__path__[0], 'salt', 'formulas'))
        for formula in os.listdir(formulas_path):
            formula_path = os.path.join(self.salt_formula_root, '', formula)
            watchmaker.utils.copytree(
                os.sep.join((formulas_path, formula)),
                formula_path,
                force=True
            )

        # Obtain & extract any Salt formulas specified in user_formulas.
        for formula_name, formula_url in self.user_formulas.items():
            filename = os.path.basename(formula_url)
            file_loc = os.sep.join((self.working_dir, filename))

            # Download the formula
            self.retrieve_file(formula_url, file_loc)

            # Extract the formula
            formula_working_dir = self.create_working_dir(
                self.working_dir,