chore: import upstream snapshot with attribution

tensorflow/python/compat/compat_test.py

@@ -0,0 +1,122 @@
+# Copyright 2018 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 forward and backwards compatibility utilities."""
+
+import datetime
+import os
+from tensorflow.python.compat import compat
+from tensorflow.python.platform import test
+
+
+class CompatTest(test.TestCase):
+
+  def _compatibility_date(self):
+    date = compat._FORWARD_COMPATIBILITY_HORIZON  # pylint: disable=protected-access
+    return (date.year, date.month, date.day)
+
+  def _n_days_after(self, n):
+    date = compat._FORWARD_COMPATIBILITY_HORIZON + datetime.timedelta(days=n)  # pylint: disable=protected-access
+    return (date.year, date.month, date.day)
+
+  def test_basic(self):
+    compatibility_date = self._compatibility_date()
+    one_day_before = self._n_days_after(-1)
+    self.assertTrue(compat.forward_compatible(*one_day_before))
+    self.assertFalse(compat.forward_compatible(*compatibility_date))
+
+  def test_past(self):
+    with compat.forward_compatibility_horizon(2018, 9, 18):
+      self.assertTrue(compat.forward_compatible(2020, 4, 4))
+
+  def test_decorator(self):
+    compatibility_date = self._compatibility_date()
+    one_day_after = self._n_days_after(1)
+    with compat.forward_compatibility_horizon(*one_day_after):
+      self.assertTrue(compat.forward_compatible(*compatibility_date))
+      self.assertFalse(compat.forward_compatible(*one_day_after))
+
+    # After exiting context manager, value should be reset.
+    self.assertFalse(compat.forward_compatible(*compatibility_date))
+
+  def test_decorator_with_failure(self):
+    compatibility_date = self._compatibility_date()
+    one_day_after = self._n_days_after(1)
+
+    class DummyError(Exception):
+      pass
+
+    try:
+      with compat.forward_compatibility_horizon(*one_day_after):
+        raise DummyError()
+    except DummyError:
+      pass  # silence DummyError
+
+    # After exiting context manager, value should be reset.
+    self.assertFalse(compat.forward_compatible(*compatibility_date))
+
+  def test_environment_override(self):
+    var_name = 'TF_FORWARD_COMPATIBILITY_DELTA_DAYS'
+
+    def remove_os_environment_var():
+      try:
+        del os.environ[var_name]
+      except KeyError:
+        pass
+
+    self.addCleanup(remove_os_environment_var)
+
+    compatibility_date = self._compatibility_date()
+    one_day_before = self._n_days_after(-1)
+    one_day_after = self._n_days_after(1)
+    ten_days_after = self._n_days_after(10)
+    nine_days_after = self._n_days_after(9)
+
+    self.assertTrue(compat.forward_compatible(*one_day_before))
+    self.assertFalse(compat.forward_compatible(*compatibility_date))
+    self.assertFalse(compat.forward_compatible(*one_day_after))
+    self.assertFalse(compat.forward_compatible(*nine_days_after))
+    self.assertFalse(compat.forward_compatible(*ten_days_after))
+
+    os.environ[var_name] = '10'
+    compat._update_forward_compatibility_date_number()
+    self.assertTrue(compat.forward_compatible(*one_day_before))
+    self.assertTrue(compat.forward_compatible(*compatibility_date))
+    self.assertTrue(compat.forward_compatible(*one_day_after))
+    self.assertTrue(compat.forward_compatible(*nine_days_after))
+    self.assertFalse(compat.forward_compatible(*ten_days_after))
+
+    del os.environ[var_name]
+    compat._update_forward_compatibility_date_number()
+    self.assertTrue(compat.forward_compatible(*one_day_before))
+    self.assertFalse(compat.forward_compatible(*compatibility_date))
+    self.assertFalse(compat.forward_compatible(*one_day_after))
+    self.assertFalse(compat.forward_compatible(*nine_days_after))
+    self.assertFalse(compat.forward_compatible(*ten_days_after))
+
+    # Now test interaction between environment variable and context func.
+    os.environ[var_name] = '10'
+    compat._update_forward_compatibility_date_number()
+    self.assertTrue(compat.forward_compatible(*one_day_after))
+    with compat.forward_compatibility_horizon(*one_day_after):
+      self.assertTrue(compat.forward_compatible(*one_day_before))
+      self.assertTrue(compat.forward_compatible(*compatibility_date))
+      self.assertFalse(compat.forward_compatible(*one_day_after))
+      self.assertFalse(compat.forward_compatible(*nine_days_after))
+      self.assertFalse(compat.forward_compatible(*ten_days_after))
+    self.assertTrue(compat.forward_compatible(*one_day_after))
+
+
+if __name__ == '__main__':
+  test.main()