tests/common/parametrize.py

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# Fixture parametrizations should go here, not in conftest.py.

import pytest

from tests.common.patterns import is_valid_impala_identifier


class UniqueDatabase(object):

  @staticmethod
  def parametrize(name_prefix=None, sync_ddl=False, num_dbs=1):
    named_params = {}
    if name_prefix is not None:
      name_prefix = str(name_prefix)
      if not is_valid_impala_identifier(name_prefix):
        raise ValueError('name_prefix "{0}" is not a valid Impala identifier; check '
                         'value for long length or invalid '
                         'characters.'.format(name_prefix))
      named_params["name_prefix"] = name_prefix
    if not isinstance(sync_ddl, bool):
      raise ValueError('value {0} of sync_ddl is be a boolean'.format(sync_ddl))
    named_params["sync_ddl"] = sync_ddl
    if not isinstance(num_dbs, int) or num_dbs <= 0:
      raise ValueError("num_dbs must be an integer >= 1 but '{0}' given".format(num_dbs))
    named_params["num_dbs"] = num_dbs
    return pytest.mark.parametrize('unique_database', [named_params], indirect=True)