text: import filecmp
  import os
  import shutil
  import tempfile
  import unittest
  from test import support
  
  
  class FileCompareTestCase(unittest.TestCase):
  
      def setUp(self):
          self.name = support.TESTFN
          self.name_same = support.TESTFN + '-same'
          self.name_diff = support.TESTFN + '-diff'
          data = 'Contents of file go here.\n'
          for name in [self.name, self.name_same, self.name_diff]:
              with open(name, 'w') as output:
                  output.write(data)
          with open(self.name_diff, 'a+') as output:
              output.write('An extra line.\n')
          self.dir = tempfile.gettempdir()
  
      def tearDown(self):
          os.unlink(self.name)
          os.unlink(self.name_same)
          os.unlink(self.name_diff)
  
      def test_matching(self):
          self.assertTrue(filecmp.cmp(self.name, self.name),
              'Comparing file to itself fails')
          self.assertTrue(filecmp.cmp(self.name, self.name, shallow=False),
              'Comparing file to itself fails')
          self.assertTrue(filecmp.cmp(self.name, self.name_same),
              'Comparing file to identical file fails')
          self.assertTrue(filecmp.cmp(self.name, self.name_same, shallow=
              False), 'Comparing file to identical file fails')
  
      def test_different(self):
          self.assertFalse(filecmp.cmp(self.name, self.name_diff),
              'Mismatched files compare as equal')
          self.assertFalse(filecmp.cmp(self.name, self.dir),
              'File and directory compare as equal')
  
      def test_cache_clear(self):
          first_compare = filecmp.cmp(self.name, self.name_same, shallow=False)
          second_compare = filecmp.cmp(self.name, self.name_diff, shallow=False)
          filecmp.clear_cache()
          self.assertTrue(len(filecmp._cache) == 0,
              'Cache not cleared after calling clear_cache')
  
  
  class DirCompareTestCase(unittest.TestCase):
  
      def setUp(self):
          tmpdir = tempfile.gettempdir()
          self.dir = os.path.join(tmpdir, 'dir')
          self.dir_same = os.path.join(tmpdir, 'dir-same')
          self.dir_diff = os.path.join(tmpdir, 'dir-diff')
          self.dir_ignored = os.path.join(self.dir_same, '.hg')
          self.caseinsensitive = os.path.normcase('A') == os.path.normcase('a')
          data = 'Contents of file go here.\n'
          for dir in (self.dir, self.dir_same, self.dir_diff, self.dir_ignored):
              shutil.rmtree(dir, True)
              os.mkdir(dir)
              if self.caseinsensitive and dir is self.dir_same:
                  fn = 'FiLe'
              else:
                  fn = 'file'
              with open(os.path.join(dir, fn), 'w') as output:
                  output.write(data)
          with open(os.path.join(self.dir_diff, 'file2'), 'w') as output:
              output.write('An extra file.\n')
  
      def tearDown(self):
          for dir in (self.dir, self.dir_same, self.dir_diff):
              shutil.rmtree(dir)
  
      def test_default_ignores(self):
          self.assertIn('.hg', filecmp.DEFAULT_IGNORES)
  
      def test_cmpfiles(self):
          self.assertTrue(filecmp.cmpfiles(self.dir, self.dir, ['file']) == (
              ['file'], [], []), 'Comparing directory to itself fails')
          self.assertTrue(filecmp.cmpfiles(self.dir, self.dir_same, ['file']) ==
              (['file'], [], []), 'Comparing directory to same fails')
          self.assertTrue(filecmp.cmpfiles(self.dir, self.dir, ['file'],
              shallow=False) == (['file'], [], []),
              'Comparing directory to itself fails')
          self.assertTrue(filecmp.cmpfiles(self.dir, self.dir_same, ['file'],
              shallow=False), 'Comparing directory to same fails')
          with open(os.path.join(self.dir, 'file2'), 'w') as output:
              output.write('Different contents.\n')
          self.assertFalse(filecmp.cmpfiles(self.dir, self.dir_same, ['file',
              'file2']) == (['file'], ['file2'], []),
              'Comparing mismatched directories fails')
  
      def test_dircmp(self):
          left_dir, right_dir = self.dir, self.dir_same
          d = filecmp.dircmp(left_dir, right_dir)
          self.assertEqual(d.left, left_dir)
          self.assertEqual(d.right, right_dir)
          if self.caseinsensitive:
              self.assertEqual([d.left_list, d.right_list], [['file'], ['FiLe']])
          else:
              self.assertEqual([d.left_list, d.right_list], [['file'], ['file']])
          self.assertEqual(d.common, ['file'])
          self.assertEqual(d.left_only, [])
          self.assertEqual(d.right_only, [])
          self.assertEqual(d.same_files, ['file'])
          self.assertEqual(d.diff_files, [])
          expected_report = ['diff {} {}'.format(self.dir, self.dir_same),
              "Identical files : ['file']"]
          self._assert_report(d.report, expected_report)
          left_dir, right_dir = self.dir, self.dir_diff
          d = filecmp.dircmp(left_dir, right_dir)
          self.assertEqual(d.left, left_dir)
          self.assertEqual(d.right, right_dir)
          self.assertEqual(d.left_list, ['file'])
          self.assertEqual(d.right_list, ['file', 'file2'])
          self.assertEqual(d.common, ['file'])
          self.assertEqual(d.left_only, [])
          self.assertEqual(d.right_only, ['file2'])
          self.assertEqual(d.same_files, ['file'])
          self.assertEqual(d.diff_files, [])
          expected_report = ['diff {} {}'.format(self.dir, self.dir_diff),
              "Only in {} : ['file2']".format(self.dir_diff),
              "Identical files : ['file']"]
          self._assert_report(d.report, expected_report)
          left_dir, right_dir = self.dir, self.dir_diff
          shutil.move(os.path.join(self.dir_diff, 'file2'), os.path.join(self
              .dir, 'file2'))
          d = filecmp.dircmp(left_dir, right_dir)
          self.assertEqual(d.left, left_dir)
          self.assertEqual(d.right, right_dir)
          self.assertEqual(d.left_list, ['file', 'file2'])
          self.assertEqual(d.right_list, ['file'])
          self.assertEqual(d.common, ['file'])
          self.assertEqual(d.left_only, ['file2'])
          self.assertEqual(d.right_only, [])
          self.assertEqual(d.same_files, ['file'])
          self.assertEqual(d.diff_files, [])
          expected_report = ['diff {} {}'.format(self.dir, self.dir_diff),
              "Only in {} : ['file2']".format(self.dir),
              "Identical files : ['file']"]
          self._assert_report(d.report, expected_report)
          with open(os.path.join(self.dir_diff, 'file2'), 'w') as output:
              output.write('Different contents.\n')
          d = filecmp.dircmp(self.dir, self.dir_diff)
          self.assertEqual(d.same_files, ['file'])
          self.assertEqual(d.diff_files, ['file2'])
          expected_report = ['diff {} {}'.format(self.dir, self.dir_diff),
              "Identical files : ['file']", "Differing files : ['file2']"]
          self._assert_report(d.report, expected_report)
  
      def test_report_partial_closure(self):
          left_dir, right_dir = self.dir, self.dir_same
          d = filecmp.dircmp(left_dir, right_dir)
          expected_report = ['diff {} {}'.format(self.dir, self.dir_same),
              "Identical files : ['file']"]
          self._assert_report(d.report_partial_closure, expected_report)
  
      def test_report_full_closure(self):
          left_dir, right_dir = self.dir, self.dir_same
          d = filecmp.dircmp(left_dir, right_dir)
          expected_report = ['diff {} {}'.format(self.dir, self.dir_same),
              "Identical files : ['file']"]
          self._assert_report(d.report_full_closure, expected_report)
  
      def _assert_report(self, dircmp_report, expected_report_lines):
          with support.captured_stdout() as stdout:
              dircmp_report()
              report_lines = stdout.getvalue().strip().split('\n')
              self.assertEqual(report_lines, expected_report_lines)
  
  
  def test_main():
      support.run_unittest(FileCompareTestCase, DirCompareTestCase)
  
  
  if __name__ == '__main__':
      test_main()
  