# -*- coding: utf-8 -*-

"""

 (c) 2017 - Copyright Red Hat Inc

 Authors:

   Pierre-Yves Chibon <pingou@pingoured.fr></pingou@pingoured.fr>

"""

import os

import subprocess

import unittest

REPO_PATH = os.path.abspath(

    os.path.join(os.path.dirname(__file__), '..'))

class TestAlembic(unittest.TestCase):

    """This test class contains tests pertaining to alembic."""

    def test_alembic_history(self):

        """Enforce a linear alembic history.

        This test runs the `alembic history | grep ' (head), '` command,

        and ensure it returns only one line.

        """

        proc1 = subprocess.Popen(

            ['alembic', 'history'],

            cwd=REPO_PATH, stdout=subprocess.PIPE)

        proc2 = subprocess.Popen(

            ['grep', ' (head), '],

            stdin=proc1.stdout, stdout=subprocess.PIPE)

        stdout = proc2.communicate()[0]

        stdout = stdout.strip().split('\n')

        self.assertEqual(len(stdout), 1)

if __name__ == '__main__':

    unittest.main(verbosity=2)