sdks/python/apache_beam/typehints/typehints_test_py3.py

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#    http://www.apache.org/licenses/LICENSE-2.0
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"""Unit tests for the type-hint objects and decorators with Python 3 syntax not
supported by 2.7."""

from __future__ import absolute_import
from __future__ import print_function

import unittest

from apache_beam.transforms.core import DoFn
from apache_beam.typehints import KV
from apache_beam.typehints import Iterable
from apache_beam.typehints import decorators

decorators._enable_from_callable = True


class TestParDoAnnotations(unittest.TestCase):
  def test_with_side_input(self):
    class MyDoFn(DoFn):
      def process(self, element: float, side_input: str) -> \
          Iterable[KV[str, float]]:
        pass
    th = MyDoFn().get_type_hints()
    self.assertEqual(th.input_types, ((float, str), {}))
    self.assertEqual(th.output_types, ((KV[str, float],), {}))

  def test_pep484_annotations(self):
    class MyDoFn(DoFn):
      def process(self, element: int) -> Iterable[str]:
        pass

    print(MyDoFn().get_type_hints())
    th = MyDoFn().get_type_hints()
    self.assertEqual(th.input_types, ((int,), {}))
    self.assertEqual(th.output_types, ((str,), {}))


if __name__ == '__main__':
  unittest.main()