def show_test_stats(test_stats):
    """Print test statistics.

    :param test_stats: result of test runs.
    :type test_stats: TestStatCounter
    """
    print('\n{}'.format('_' * 50))
    print('Test Results:')
    print('{}'.format('_' * 50))
    print(test_stats),
    print('{}\n'.format('_' * 50))
