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1# Copyright 2018 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"""Tests for forward and backwards compatibility utilities."""
16
17import datetime
18import os
19from tensorflow.python.compat import compat
20from tensorflow.python.platform import test
21
22
23class CompatTest(test.TestCase):
24
25  def _compatibility_date(self):
26    date = compat._FORWARD_COMPATIBILITY_HORIZON  # pylint: disable=protected-access
27    return (date.year, date.month, date.day)
28
29  def _n_days_after(self, n):
30    date = compat._FORWARD_COMPATIBILITY_HORIZON + datetime.timedelta(days=n)  # pylint: disable=protected-access
31    return (date.year, date.month, date.day)
32
33  def test_basic(self):
34    compatibility_date = self._compatibility_date()
35    one_day_before = self._n_days_after(-1)
36    self.assertTrue(compat.forward_compatible(*one_day_before))
37    self.assertFalse(compat.forward_compatible(*compatibility_date))
38
39  def test_past(self):
40    with compat.forward_compatibility_horizon(2018, 9, 18):
41      self.assertTrue(compat.forward_compatible(2020, 4, 4))
42
43  def test_decorator(self):
44    compatibility_date = self._compatibility_date()
45    one_day_after = self._n_days_after(1)
46    with compat.forward_compatibility_horizon(*one_day_after):
47      self.assertTrue(compat.forward_compatible(*compatibility_date))
48      self.assertFalse(compat.forward_compatible(*one_day_after))
49
50    # After exiting context manager, value should be reset.
51    self.assertFalse(compat.forward_compatible(*compatibility_date))
52
53  def test_decorator_with_failure(self):
54    compatibility_date = self._compatibility_date()
55    one_day_after = self._n_days_after(1)
56
57    class DummyError(Exception):
58      pass
59
60    try:
61      with compat.forward_compatibility_horizon(*one_day_after):
62        raise DummyError()
63    except DummyError:
64      pass  # silence DummyError
65
66    # After exiting context manager, value should be reset.
67    self.assertFalse(compat.forward_compatible(*compatibility_date))
68
69  def test_environment_override(self):
70    var_name = 'TF_FORWARD_COMPATIBILITY_DELTA_DAYS'
71
72    def remove_os_environment_var():
73      try:
74        del os.environ[var_name]
75      except KeyError:
76        pass
77
78    self.addCleanup(remove_os_environment_var)
79
80    compatibility_date = self._compatibility_date()
81    one_day_before = self._n_days_after(-1)
82    one_day_after = self._n_days_after(1)
83    ten_days_after = self._n_days_after(10)
84    nine_days_after = self._n_days_after(9)
85
86    self.assertTrue(compat.forward_compatible(*one_day_before))
87    self.assertFalse(compat.forward_compatible(*compatibility_date))
88    self.assertFalse(compat.forward_compatible(*one_day_after))
89    self.assertFalse(compat.forward_compatible(*nine_days_after))
90    self.assertFalse(compat.forward_compatible(*ten_days_after))
91
92    os.environ[var_name] = '10'
93    compat._update_forward_compatibility_date_number()
94    self.assertTrue(compat.forward_compatible(*one_day_before))
95    self.assertTrue(compat.forward_compatible(*compatibility_date))
96    self.assertTrue(compat.forward_compatible(*one_day_after))
97    self.assertTrue(compat.forward_compatible(*nine_days_after))
98    self.assertFalse(compat.forward_compatible(*ten_days_after))
99
100    del os.environ[var_name]
101    compat._update_forward_compatibility_date_number()
102    self.assertTrue(compat.forward_compatible(*one_day_before))
103    self.assertFalse(compat.forward_compatible(*compatibility_date))
104    self.assertFalse(compat.forward_compatible(*one_day_after))
105    self.assertFalse(compat.forward_compatible(*nine_days_after))
106    self.assertFalse(compat.forward_compatible(*ten_days_after))
107
108    # Now test interaction between environment variable and context func.
109    os.environ[var_name] = '10'
110    compat._update_forward_compatibility_date_number()
111    self.assertTrue(compat.forward_compatible(*one_day_after))
112    with compat.forward_compatibility_horizon(*one_day_after):
113      self.assertTrue(compat.forward_compatible(*one_day_before))
114      self.assertTrue(compat.forward_compatible(*compatibility_date))
115      self.assertFalse(compat.forward_compatible(*one_day_after))
116      self.assertFalse(compat.forward_compatible(*nine_days_after))
117      self.assertFalse(compat.forward_compatible(*ten_days_after))
118    self.assertTrue(compat.forward_compatible(*one_day_after))
119
120
121if __name__ == '__main__':
122  test.main()
123