# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Tests for misc module."""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

from tensorflow.contrib.py2tf.utils import misc
from tensorflow.python.framework import constant_op
from tensorflow.python.ops import variables
from tensorflow.python.platform import test


class ContextManagersTest(test.TestCase):

  def test_alias_single_tensor(self):
    a = constant_op.constant(1)

    new_a = misc.alias_tensors(a)
    self.assertFalse(new_a is a)
    with self.test_session() as sess:
      self.assertEqual(1, sess.run(new_a))

  def test_alias_tensors(self):
    a = constant_op.constant(1)
    v = variables.Variable(2)
    s = 'a'
    l = [1, 2, 3]

    new_a, new_v, new_s, new_l = misc.alias_tensors(a, v, s, l)

    self.assertFalse(new_a is a)
    self.assertTrue(new_v is v)
    self.assertTrue(new_s is s)
    self.assertTrue(new_l is l)
    with self.test_session() as sess:
      self.assertEqual(1, sess.run(new_a))


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