import os.path
import subprocess
import unittest


class TestAPICompat(unittest.TestCase):

    # path to dump-api script
    SCRIPT = os.path.relpath(os.path.dirname(__file__) + '/../../devtools/check-api')

    # base api data, as generated by dump-api
    BASE = os.path.relpath(os.path.dirname(__file__) + '/data/api.json')

    def test_api_compat(self):
        cmd = [self.SCRIPT, self.BASE]
        proc = subprocess.Popen(cmd, stderr=subprocess.PIPE)
        (_, err) = proc.communicate()
        status = proc.wait()
        errors = 0
        for line in err.decode().splitlines():
            if line.startswith('ERROR'):
                print(line)
                errors += 1
        if errors or status != 0:
            print('Command failed: %s' % ' '.join(cmd))
            raise Exception('API verification failed')


# the end