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"""Tools for creating tests of implementations of the Face layer."""

# unittest is referenced from specification in this module.
import unittest  # pylint: disable=unused-import

# test_interfaces is referenced from specification in this module.
from tests.unit.framework.interfaces.face import _blocking_invocation_inline_service
from tests.unit.framework.interfaces.face import _event_invocation_synchronous_event_service
from tests.unit.framework.interfaces.face import _future_invocation_asynchronous_event_service
from tests.unit.framework.interfaces.face import _invocation
from tests.unit.framework.interfaces.face import test_interfaces  # pylint: disable=unused-import

_TEST_CASE_SUPERCLASSES = (
    _blocking_invocation_inline_service.TestCase,
    _event_invocation_synchronous_event_service.TestCase,
    _future_invocation_asynchronous_event_service.TestCase,
)


def test_cases(implementation):
  """Creates unittest.TestCase classes for a given Face layer implementation.

  Args:
    implementation: A test_interfaces.Implementation specifying creation and
      destruction of a given Face layer implementation.

  Returns:
    A sequence of subclasses of unittest.TestCase defining tests of the
      specified Face layer implementation.
  """
  test_case_classes = []
  for invoker_constructor in _invocation.invoker_constructors():
    for super_class in _TEST_CASE_SUPERCLASSES:
      test_case_classes.append(
          type(invoker_constructor.name() + super_class.NAME, (super_class,),
               {'implementation': implementation,
                'invoker_constructor': invoker_constructor,
                '__module__': implementation.__module__,
               }))
  return test_case_classes
