text: #!/usr/bin/env python
  # coding: utf-8
  
  # Copyright (c) "Neo4j"
  # Neo4j Sweden AB [http://neo4j.com]
  #
  # This file is part of Neo4j.
  #
  # 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.
  
  
  from unittest import TestCase
  
  from neo4j.time import Clock, ClockTime
  
  
  class ClockTestCase(TestCase):
  
      def test_no_clock_implementations(self):
          try:
              Clock._Clock__implementations = []
              with self.assertRaises(RuntimeError):
                  _ = Clock()
          finally:
              Clock._Clock__implementations = None
  
      def test_base_clock_precision(self):
          clock = object.__new__(Clock)
          with self.assertRaises(NotImplementedError):
              _ = clock.precision()
  
      def test_base_clock_available(self):
          clock = object.__new__(Clock)
          with self.assertRaises(NotImplementedError):
              _ = clock.available()
  
      def test_base_clock_utc_time(self):
          clock = object.__new__(Clock)
          with self.assertRaises(NotImplementedError):
              _ = clock.utc_time()
  
      def test_local_offset(self):
          clock = object.__new__(Clock)
          offset = clock.local_offset()
          self.assertIsInstance(offset, ClockTime)
  
      def test_local_time(self):
          _ = Clock()
          for impl in Clock._Clock__implementations:
              self.assert_(issubclass(impl, Clock))
              clock = object.__new__(impl)
              time = clock.local_time()
              self.assertIsInstance(time, ClockTime)
  
      def test_utc_time(self):
          _ = Clock()
          for impl in Clock._Clock__implementations:
              self.assert_(issubclass(impl, Clock))
              clock = object.__new__(impl)
              time = clock.utc_time()
              self.assertIsInstance(time, ClockTime)
  