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1# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#     http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14# ==============================================================================
15"""Unit tests for tf_contextlib."""
16
17# pylint: disable=unused-import
18from __future__ import absolute_import
19from __future__ import division
20from __future__ import print_function
21
22from tensorflow.python.platform import test
23from tensorflow.python.util import tf_contextlib
24from tensorflow.python.util import tf_decorator
25from tensorflow.python.util import tf_inspect
26
27
28@tf_contextlib.contextmanager
29def test_yield_append_before_and_after_yield(x, before, after):
30  x.append(before)
31  yield
32  x.append(after)
33
34
35@tf_contextlib.contextmanager
36def test_yield_return_x_plus_1(x):
37  yield x + 1
38
39
40@tf_contextlib.contextmanager
41def test_params_and_defaults(a, b=2, c=True, d='hello'):
42  return [a, b, c, d]
43
44
45class TfContextlibTest(test.TestCase):
46
47  def testRunsCodeBeforeYield(self):
48    x = []
49    with test_yield_append_before_and_after_yield(x, 'before', ''):
50      self.assertEqual('before', x[-1])
51
52  def testRunsCodeAfterYield(self):
53    x = []
54    with test_yield_append_before_and_after_yield(x, '', 'after'):
55      pass
56    self.assertEqual('after', x[-1])
57
58  def testNestedWith(self):
59    x = []
60    with test_yield_append_before_and_after_yield(x, 'before', 'after'):
61      with test_yield_append_before_and_after_yield(x, 'inner', 'outer'):
62        with test_yield_return_x_plus_1(1) as var:
63          x.append(var)
64    self.assertEqual(['before', 'inner', 2, 'outer', 'after'], x)
65
66  def testMultipleCallsOfSeparateInstances(self):
67    x = []
68    with test_yield_append_before_and_after_yield(x, 1, 2):
69      pass
70    with test_yield_append_before_and_after_yield(x, 3, 4):
71      pass
72    self.assertEqual([1, 2, 3, 4], x)
73
74  def testReturnsResultFromYield(self):
75    with test_yield_return_x_plus_1(3) as result:
76      self.assertEqual(4, result)
77
78  def testUnwrapContextManager(self):
79    decorators, target = tf_decorator.unwrap(test_params_and_defaults)
80    self.assertEqual(1, len(decorators))
81    self.assertTrue(isinstance(decorators[0], tf_decorator.TFDecorator))
82    self.assertEqual('contextmanager', decorators[0].decorator_name)
83    self.assertFalse(isinstance(target, tf_decorator.TFDecorator))
84
85  def testGetArgSpecReturnsWrappedArgSpec(self):
86    argspec = tf_inspect.getargspec(test_params_and_defaults)
87    self.assertEqual(['a', 'b', 'c', 'd'], argspec.args)
88    self.assertEqual((2, True, 'hello'), argspec.defaults)
89
90
91if __name__ == '__main__':
92  test.main()
93