text: '''
  Tests for fileinput module.
  Nick Mathewson
  '''
  import os
  import sys
  import re
  import fileinput
  import collections
  import builtins
  import unittest
  
  try:
      import bz2
  except ImportError:
      bz2 = None
  try:
      import gzip
  except ImportError:
      gzip = None
  
  from io import BytesIO, StringIO
  from fileinput import FileInput, hook_encoded
  
  from test.support import verbose, TESTFN, check_warnings
  from test.support import unlink as safe_unlink
  from test import support
  from unittest import mock
  
  
  # The fileinput module has 2 interfaces: the FileInput class which does
  # all the work, and a few functions (input, etc.) that use a global _state
  # variable.
  
  # Write lines (a list of lines) to temp file number i, and return the
  # temp file's name.
  def writeTmp(i, lines, mode='w'):  # opening in text mode is the default
      name = TESTFN + str(i)
      f = open(name, mode)
      for line in lines:
          f.write(line)
      f.close()
      return name
  
  def remove_tempfiles(*names):
      for name in names:
          if name:
              safe_unlink(name)
  
  class LineReader:
  
      def __init__(self):
          self._linesread = []
  
      @property
      def linesread(self):
          try:
              return self._linesread[:]
          finally:
              self._linesread = []
  
      def openhook(self, filename, mode):
          self.it = iter(filename.splitlines(True))
          return self
  
      def readline(self, size=None):
          line = next(self.it, '')
          self._linesread.append(line)
          return line
  
      def readlines(self, hint=-1):
          lines = []
          size = 0
          while True:
              line = self.readline()
              if not line:
                  return lines
              lines.append(line)
              size += len(line)
              if size >= hint:
                  return lines
  
      def close(self):
          pass
  
  class BufferSizesTests(unittest.TestCase):
      def test_buffer_sizes(self):
          # First, run the tests with default and teeny buffer size.
          for round, bs in (0, 0), (1, 30):
              t1 = t2 = t3 = t4 = None
              try:
                  t1 = writeTmp(1, ["Line %s of file 1\n" % (i+1) for i in range(15)])
                  t2 = writeTmp(2, ["Line %s of file 2\n" % (i+1) for i in range(10)])
                  t3 = writeTmp(3, ["Line %s of file 3\n" % (i+1) for i in range(5)])
                  t4 = writeTmp(4, ["Line %s of file 4\n" % (i+1) for i in range(1)])
                  if bs:
                      with self.assertWarns(DeprecationWarning):
                          self.buffer_size_test(t1, t2, t3, t4, bs, round)
                  else:
                      self.buffer_size_test(t1, t2, t3, t4, bs, round)
              finally:
                  remove_tempfiles(t1, t2, t3, t4)
  
      def buffer_size_test(self, t1, t2, t3, t4, bs=0, round=0):
          pat = re.compile(r'LINE (\d+) OF FILE (\d+)')
  
          start = 1 + round*6
          if verbose:
              print('%s. Simple iteration (bs=%s)' % (start+0, bs))
          fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
          lines = list(fi)
          fi.close()
          self.assertEqual(len(lines), 31)
          self.assertEqual(lines[4], 'Line 5 of file 1\n')
          self.assertEqual(lines[30], 'Line 1 of file 4\n')
          self.assertEqual(fi.lineno(), 31)
          self.assertEqual(fi.filename(), t4)
  
          if verbose:
              print('%s. Status variables (bs=%s)' % (start+1, bs))
          fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
          s = "x"
          while s and s != 'Line 6 of file 2\n':
              s = fi.readline()
          self.assertEqual(fi.filename(), t2)
          self.assertEqual(fi.lineno(), 21)
          self.assertEqual(fi.filelineno(), 6)
          self.assertFalse(fi.isfirstline())
          self.assertFalse(fi.isstdin())
  
          if verbose:
              print('%s. Nextfile (bs=%s)' % (start+2, bs))
          fi.nextfile()
          self.assertEqual(fi.readline(), 'Line 1 of file 3\n')
          self.assertEqual(fi.lineno(), 22)
          fi.close()
  
          if verbose:
              print('%s. Stdin (bs=%s)' % (start+3, bs))
          fi = FileInput(files=(t1, t2, t3, t4, '-'), bufsize=bs)
          savestdin = sys.stdin
          try:
              sys.stdin = StringIO("Line 1 of stdin\nLine 2 of stdin\n")
              lines = list(fi)
              self.assertEqual(len(lines), 33)
              self.assertEqual(lines[32], 'Line 2 of stdin\n')
              self.assertEqual(fi.filename(), '<stdin>')
              fi.nextfile()
          finally:
              sys.stdin = savestdin
  
          if verbose:
              print('%s. Boundary conditions (bs=%s)' % (start+4, bs))
          fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
          self.assertEqual(fi.lineno(), 0)
          self.assertEqual(fi.filename(), None)
          fi.nextfile()
          self.assertEqual(fi.lineno(), 0)
          self.assertEqual(fi.filename(), None)
  
          if verbose:
              print('%s. Inplace (bs=%s)' % (start+5, bs))
          savestdout = sys.stdout
          try:
              fi = FileInput(files=(t1, t2, t3, t4), inplace=1, bufsize=bs)
              for line in fi:
                  line = line[:-1].upper()
                  print(line)
              fi.close()
          finally:
              sys.stdout = savestdout
  
          fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
          for line in fi:
              self.assertEqual(line[-1], '\n')
              m = pat.match(line[:-1])
              self.assertNotEqual(m, None)
              self.assertEqual(int(m.group(1)), fi.filelineno())
          fi.close()
  
  class UnconditionallyRaise:
      def __init__(self, exception_type):
          self.exception_type = exception_type
          self.invoked = False
      def __call__(self, *args, **kwargs):
          self.invoked = True
          raise self.exception_type()
  
  class FileInputTests(unittest.TestCase):
  
      def test_zero_byte_files(self):
          t1 = t2 = t3 = t4 = None
          try:
              t1 = writeTmp(1, [""])
              t2 = writeTmp(2, [""])
              t3 = writeTmp(3, ["The only line there is.\n"])
              t4 = writeTmp(4, [""])
              fi = FileInput(files=(t1, t2, t3, t4))
  
              line = fi.readline()
              self.assertEqual(line, 'The only line there is.\n')
              self.assertEqual(fi.lineno(), 1)
              self.assertEqual(fi.filelineno(), 1)
              self.assertEqual(fi.filename(), t3)
  
              line = fi.readline()
              self.assertFalse(line)
              self.assertEqual(fi.lineno(), 1)
              self.assertEqual(fi.filelineno(), 0)
              self.assertEqual(fi.filename(), t4)
              fi.close()
          finally:
              remove_tempfiles(t1, t2, t3, t4)
  
      def test_files_that_dont_end_with_newline(self):
          t1 = t2 = None
          try:
              t1 = writeTmp(1, ["A\nB\nC"])
              t2 = writeTmp(2, ["D\nE\nF"])
              fi = FileInput(files=(t1, t2))
              lines = list(fi)
              self.assertEqual(lines, ["A\n", "B\n", "C", "D\n", "E\n", "F"])
              self.assertEqual(fi.filelineno(), 3)
              self.assertEqual(fi.lineno(), 6)
          finally:
              remove_tempfiles(t1, t2)
  
  ##     def test_unicode_filenames(self):
  ##         # XXX A unicode string is always returned by writeTmp.
  ##         #     So is this needed?
  ##         try:
  ##             t1 = writeTmp(1, ["A\nB"])
  ##             encoding = sys.getfilesystemencoding()
  ##             if encoding is None:
  ##                 encoding = 'ascii'
  ##             fi = FileInput(files=str(t1, encoding))
  ##             lines = list(fi)
  ##             self.assertEqual(lines, ["A\n", "B"])
  ##         finally:
  ##             remove_tempfiles(t1)
  
      def test_fileno(self):
          t1 = t2 = None
          try:
              t1 = writeTmp(1, ["A\nB"])
              t2 = writeTmp(2, ["C\nD"])
              fi = FileInput(files=(t1, t2))
              self.assertEqual(fi.fileno(), -1)
              line =next( fi)
              self.assertNotEqual(fi.fileno(), -1)
              fi.nextfile()
              self.assertEqual(fi.fileno(), -1)
              line = list(fi)
              self.assertEqual(fi.fileno(), -1)
          finally:
              remove_tempfiles(t1, t2)
  
      def test_opening_mode(self):
          try:
              # invalid mode, should raise ValueError
              fi = FileInput(mode="w")
              self.fail("FileInput should reject invalid mode argument")
          except ValueError:
              pass
          t1 = None
          try:
              # try opening in universal newline mode
              t1 = writeTmp(1, [b"A\nB\r\nC\rD"], mode="wb")
              with check_warnings(('', DeprecationWarning)):
                  fi = FileInput(files=t1, mode="U")
              with check_warnings(('', DeprecationWarning)):
                  lines = list(fi)
              self.assertEqual(lines, ["A\n", "B\n", "C\n", "D"])
          finally:
              remove_tempfiles(t1)
  
      def test_stdin_binary_mode(self):
          with mock.patch('sys.stdin') as m_stdin:
              m_stdin.buffer = BytesIO(b'spam, bacon, sausage, and spam')
              fi = FileInput(files=['-'], mode='rb')
              lines = list(fi)
              self.assertEqual(lines, [b'spam, bacon, sausage, and spam'])
  
      def test_detached_stdin_binary_mode(self):
          orig_stdin = sys.stdin
          try:
              sys.stdin = BytesIO(b'spam, bacon, sausage, and spam')
              self.assertFalse(hasattr(sys.stdin, 'buffer'))
              fi = FileInput(files=['-'], mode='rb')
              lines = list(fi)
              self.assertEqual(lines, [b'spam, bacon, sausage, and spam'])
          finally:
              sys.stdin = orig_stdin
  
      def test_file_opening_hook(self):
          try:
              # cannot use openhook and inplace mode
              fi = FileInput(inplace=1, openhook=lambda f, m: None)
              self.fail("FileInput should raise if both inplace "
                               "and openhook arguments are given")
          except ValueError:
              pass
          try:
              fi = FileInput(openhook=1)
              self.fail("FileInput should check openhook for being callable")
          except ValueError:
              pass
  
          class CustomOpenHook:
              def __init__(self):
                  self.invoked = False
              def __call__(self, *args):
                  self.invoked = True
                  return open(*args)
  
          t = writeTmp(1, ["\n"])
          self.addCleanup(remove_tempfiles, t)
          custom_open_hook = CustomOpenHook()
          with FileInput([t], openhook=custom_open_hook) as fi:
              fi.readline()
          self.assertTrue(custom_open_hook.invoked, "openhook not invoked")
  
      def test_readline(self):
          with open(TESTFN, 'wb') as f:
              f.write(b'A\nB\r\nC\r')
              # Fill TextIOWrapper buffer.
              f.write(b'123456789\n' * 1000)
              # Issue #20501: readline() shouldn't read whole file.
              f.write(b'\x80')
          self.addCleanup(safe_unlink, TESTFN)
  
          with FileInput(files=TESTFN,
                         openhook=hook_encoded('ascii')) as fi:
              try:
                  self.assertEqual(fi.readline(), 'A\n')
                  self.assertEqual(fi.readline(), 'B\n')
                  self.assertEqual(fi.readline(), 'C\n')
              except UnicodeDecodeError:
                  self.fail('Read to end of file')
              with self.assertRaises(UnicodeDecodeError):
                  # Read to the end of file.
                  list(fi)
              self.assertEqual(fi.readline(), '')
              self.assertEqual(fi.readline(), '')
  
      def test_readline_binary_mode(self):
          with open(TESTFN, 'wb') as f:
              f.write(b'A\nB\r\nC\rD')
          self.addCleanup(safe_unlink, TESTFN)
  
          with FileInput(files=TESTFN, mode='rb') as fi:
              self.assertEqual(fi.readline(), b'A\n')
              self.assertEqual(fi.readline(), b'B\r\n')
              self.assertEqual(fi.readline(), b'C\rD')
              # Read to the end of file.
              self.assertEqual(fi.readline(), b'')
              self.assertEqual(fi.readline(), b'')
  
      def test_context_manager(self):
          try:
              t1 = writeTmp(1, ["A\nB\nC"])
              t2 = writeTmp(2, ["D\nE\nF"])
              with FileInput(files=(t1, t2)) as fi:
                  lines = list(fi)
              self.assertEqual(lines, ["A\n", "B\n", "C", "D\n", "E\n", "F"])
              self.assertEqual(fi.filelineno(), 3)
              self.assertEqual(fi.lineno(), 6)
              self.assertEqual(fi._files, ())
          finally:
              remove_tempfiles(t1, t2)
  
      def test_close_on_exception(self):
          try:
              t1 = writeTmp(1, [""])
              with FileInput(files=t1) as fi:
                  raise OSError
          except OSError:
              self.assertEqual(fi._files, ())
          finally:
              remove_tempfiles(t1)
  
      def test_empty_files_list_specified_to_constructor(self):
          with FileInput(files=[]) as fi:
              self.assertEqual(fi._files, ('-',))
  
      def test__getitem__(self):
          """Tests invoking FileInput.__getitem__() with the current
             line number"""
          t = writeTmp(1, ["line1\n", "line2\n"])
          self.addCleanup(remove_tempfiles, t)
          with FileInput(files=[t]) as fi:
              retval1 = fi[0]
              self.assertEqual(retval1, "line1\n")
              retval2 = fi[1]
              self.assertEqual(retval2, "line2\n")
  
      def test__getitem__invalid_key(self):
          """Tests invoking FileInput.__getitem__() with an index unequal to
             the line number"""
          t = writeTmp(1, ["line1\n", "line2\n"])
          self.addCleanup(remove_tempfiles, t)
          with FileInput(files=[t]) as fi:
              with self.assertRaises(RuntimeError) as cm:
                  fi[1]
          self.assertEqual(cm.exception.args, ("accessing lines out of order",))
  
      def test__getitem__eof(self):
          """Tests invoking FileInput.__getitem__() with the line number but at
             end-of-input"""
          t = writeTmp(1, [])
          self.addCleanup(remove_tempfiles, t)
          with FileInput(files=[t]) as fi:
              with self.assertRaises(IndexError) as cm:
                  fi[0]
          self.assertEqual(cm.exception.args, ("end of input reached",))
  
      def test_nextfile_oserror_deleting_backup(self):
          """Tests invoking FileInput.nextfile() when the attempt to delete
             the backup file would raise OSError.  This error is expected to be
             silently ignored"""
  
          os_unlink_orig = os.unlink
          os_unlink_replacement = UnconditionallyRaise(OSError)
          try:
              t = writeTmp(1, ["\n"])
              self.addCleanup(remove_tempfiles, t)
              with FileInput(files=[t], inplace=True) as fi:
                  next(fi) # make sure the file is opened
                  os.unlink = os_unlink_replacement
                  fi.nextfile()
          finally:
              os.unlink = os_unlink_orig
  
          # sanity check to make sure that our test scenario was actually hit
          self.assertTrue(os_unlink_replacement.invoked,
                          "os.unlink() was not invoked")
  
      def test_readline_os_fstat_raises_OSError(self):
          """Tests invoking FileInput.readline() when os.fstat() raises OSError.
             This exception should be silently discarded."""
  
          os_fstat_orig = os.fstat
          os_fstat_replacement = UnconditionallyRaise(OSError)
          try:
              t = writeTmp(1, ["\n"])
              self.addCleanup(remove_tempfiles, t)
              with FileInput(files=[t], inplace=True) as fi:
                  os.fstat = os_fstat_replacement
                  fi.readline()
          finally:
              os.fstat = os_fstat_orig
  
          # sanity check to make sure that our test scenario was actually hit
          self.assertTrue(os_fstat_replacement.invoked,
                          "os.fstat() was not invoked")
  
      @unittest.skipIf(not hasattr(os, "chmod"), "os.chmod does not exist")
      def test_readline_os_chmod_raises_OSError(self):
          """Tests invoking FileInput.readline() when os.chmod() raises OSError.
             This exception should be silently discarded."""
  
          os_chmod_orig = os.chmod
          os_chmod_replacement = UnconditionallyRaise(OSError)
          try:
              t = writeTmp(1, ["\n"])
              self.addCleanup(remove_tempfiles, t)
              with FileInput(files=[t], inplace=True) as fi:
                  os.chmod = os_chmod_replacement
                  fi.readline()
          finally:
              os.chmod = os_chmod_orig
  
          # sanity check to make sure that our test scenario was actually hit
          self.assertTrue(os_chmod_replacement.invoked,
                          "os.fstat() was not invoked")
  
      def test_fileno_when_ValueError_raised(self):
          class FilenoRaisesValueError(UnconditionallyRaise):
              def __init__(self):
                  UnconditionallyRaise.__init__(self, ValueError)
              def fileno(self):
                  self.__call__()
  
          unconditionally_raise_ValueError = FilenoRaisesValueError()
          t = writeTmp(1, ["\n"])
          self.addCleanup(remove_tempfiles, t)
          with FileInput(files=[t]) as fi:
              file_backup = fi._file
              try:
                  fi._file = unconditionally_raise_ValueError
                  result = fi.fileno()
              finally:
                  fi._file = file_backup # make sure the file gets cleaned up
  
          # sanity check to make sure that our test scenario was actually hit
          self.assertTrue(unconditionally_raise_ValueError.invoked,
                          "_file.fileno() was not invoked")
  
          self.assertEqual(result, -1, "fileno() should return -1")
  
      def test_readline_buffering(self):
          src = LineReader()
          with FileInput(files=['line1\nline2', 'line3\n'],
                         openhook=src.openhook) as fi:
              self.assertEqual(src.linesread, [])
              self.assertEqual(fi.readline(), 'line1\n')
              self.assertEqual(src.linesread, ['line1\n'])
              self.assertEqual(fi.readline(), 'line2')
              self.assertEqual(src.linesread, ['line2'])
              self.assertEqual(fi.readline(), 'line3\n')
              self.assertEqual(src.linesread, ['', 'line3\n'])
              self.assertEqual(fi.readline(), '')
              self.assertEqual(src.linesread, [''])
              self.assertEqual(fi.readline(), '')
              self.assertEqual(src.linesread, [])
  
      def test_iteration_buffering(self):
          src = LineReader()
          with FileInput(files=['line1\nline2', 'line3\n'],
                         openhook=src.openhook) as fi:
              self.assertEqual(src.linesread, [])
              self.assertEqual(next(fi), 'line1\n')
              self.assertEqual(src.linesread, ['line1\n'])
              self.assertEqual(next(fi), 'line2')
              self.assertEqual(src.linesread, ['line2'])
              self.assertEqual(next(fi), 'line3\n')
              self.assertEqual(src.linesread, ['', 'line3\n'])
              self.assertRaises(StopIteration, next, fi)
              self.assertEqual(src.linesread, [''])
              self.assertRaises(StopIteration, next, fi)
              self.assertEqual(src.linesread, [])
  
  class MockFileInput:
      """A class that mocks out fileinput.FileInput for use during unit tests"""
  
      def __init__(self, files=None, inplace=False, backup="", bufsize=0,
                   mode="r", openhook=None):
          self.files = files
          self.inplace = inplace
          self.backup = backup
          self.bufsize = bufsize
          self.mode = mode
          self.openhook = openhook
          self._file = None
          self.invocation_counts = collections.defaultdict(lambda: 0)
          self.return_values = {}
  
      def close(self):
          self.invocation_counts["close"] += 1
  
      def nextfile(self):
          self.invocation_counts["nextfile"] += 1
          return self.return_values["nextfile"]
  
      def filename(self):
          self.invocation_counts["filename"] += 1
          return self.return_values["filename"]
  
      def lineno(self):
          self.invocation_counts["lineno"] += 1
          return self.return_values["lineno"]
  
      def filelineno(self):
          self.invocation_counts["filelineno"] += 1
          return self.return_values["filelineno"]
  
      def fileno(self):
          self.invocation_counts["fileno"] += 1
          return self.return_values["fileno"]
  
      def isfirstline(self):
          self.invocation_counts["isfirstline"] += 1
          return self.return_values["isfirstline"]
  
      def isstdin(self):
          self.invocation_counts["isstdin"] += 1
          return self.return_values["isstdin"]
  
  class BaseFileInputGlobalMethodsTest(unittest.TestCase):
      """Base class for unit tests for the global function of
         the fileinput module."""
  
      def setUp(self):
          self._orig_state = fileinput._state
          self._orig_FileInput = fileinput.FileInput
          fileinput.FileInput = MockFileInput
  
      def tearDown(self):
          fileinput.FileInput = self._orig_FileInput
          fileinput._state = self._orig_state
  
      def assertExactlyOneInvocation(self, mock_file_input, method_name):
          # assert that the method with the given name was invoked once
          actual_count = mock_file_input.invocation_counts[method_name]
          self.assertEqual(actual_count, 1, method_name)
          # assert that no other unexpected methods were invoked
          actual_total_count = len(mock_file_input.invocation_counts)
          self.assertEqual(actual_total_count, 1)
  
  class Test_fileinput_input(BaseFileInputGlobalMethodsTest):
      """Unit tests for fileinput.input()"""
  
      def test_state_is_not_None_and_state_file_is_not_None(self):
          """Tests invoking fileinput.input() when fileinput._state is not None
             and its _file attribute is also not None.  Expect RuntimeError to
             be raised with a meaningful error message and for fileinput._state
             to *not* be modified."""
          instance = MockFileInput()
          instance._file = object()
          fileinput._state = instance
          with self.assertRaises(RuntimeError) as cm:
              fileinput.input()
          self.assertEqual(("input() already active",), cm.exception.args)
          self.assertIs(instance, fileinput._state, "fileinput._state")
  
      def test_state_is_not_None_and_state_file_is_None(self):
          """Tests invoking fileinput.input() when fileinput._state is not None
             but its _file attribute *is* None.  Expect it to create and return
             a new fileinput.FileInput object with all method parameters passed
             explicitly to the __init__() method; also ensure that
             fileinput._state is set to the returned instance."""
          instance = MockFileInput()
          instance._file = None
          fileinput._state = instance
          self.do_test_call_input()
  
      def test_state_is_None(self):
          """Tests invoking fileinput.input() when fileinput._state is None
             Expect it to create and return a new fileinput.FileInput object
             with all method parameters passed explicitly to the __init__()
             method; also ensure that fileinput._state is set to the returned
             instance."""
          fileinput._state = None
          self.do_test_call_input()
  
      def do_test_call_input(self):
          """Tests that fileinput.input() creates a new fileinput.FileInput
             object, passing the given parameters unmodified to
             fileinput.FileInput.__init__().  Note that this test depends on the
             monkey patching of fileinput.FileInput done by setUp()."""
          files = object()
          inplace = object()
          backup = object()
          bufsize = object()
          mode = object()
          openhook = object()
  
          # call fileinput.input() with different values for each argument
          result = fileinput.input(files=files, inplace=inplace, backup=backup,
                                   bufsize=bufsize,
              mode=mode, openhook=openhook)
  
          # ensure fileinput._state was set to the returned object
          self.assertIs(result, fileinput._state, "fileinput._state")
  
          # ensure the parameters to fileinput.input() were passed directly
          # to FileInput.__init__()
          self.assertIs(files, result.files, "files")
          self.assertIs(inplace, result.inplace, "inplace")
          self.assertIs(backup, result.backup, "backup")
          self.assertIs(bufsize, result.bufsize, "bufsize")
          self.assertIs(mode, result.mode, "mode")
          self.assertIs(openhook, result.openhook, "openhook")
  
  class Test_fileinput_close(BaseFileInputGlobalMethodsTest):
      """Unit tests for fileinput.close()"""
  
      def test_state_is_None(self):
          """Tests that fileinput.close() does nothing if fileinput._state
             is None"""
          fileinput._state = None
          fileinput.close()
          self.assertIsNone(fileinput._state)
  
      def test_state_is_not_None(self):
          """Tests that fileinput.close() invokes close() on fileinput._state
             and sets _state=None"""
          instance = MockFileInput()
          fileinput._state = instance
          fileinput.close()
          self.assertExactlyOneInvocation(instance, "close")
          self.assertIsNone(fileinput._state)
  
  class Test_fileinput_nextfile(BaseFileInputGlobalMethodsTest):
      """Unit tests for fileinput.nextfile()"""
  
      def test_state_is_None(self):
          """Tests fileinput.nextfile() when fileinput._state is None.
             Ensure that it raises RuntimeError with a meaningful error message
             and does not modify fileinput._state"""
          fileinput._state = None
          with self.assertRaises(RuntimeError) as cm:
              fileinput.nextfile()
          self.assertEqual(("no active input()",), cm.exception.args)
          self.assertIsNone(fileinput._state)
  
      def test_state_is_not_None(self):
          """Tests fileinput.nextfile() when fileinput._state is not None.
             Ensure that it invokes fileinput._state.nextfile() exactly once,
             returns whatever it returns, and does not modify fileinput._state
             to point to a different object."""
          nextfile_retval = object()
          instance = MockFileInput()
          instance.return_values["nextfile"] = nextfile_retval
          fileinput._state = instance
          retval = fileinput.nextfile()
          self.assertExactlyOneInvocation(instance, "nextfile")
          self.assertIs(retval, nextfile_retval)
          self.assertIs(fileinput._state, instance)
  
  class Test_fileinput_filename(BaseFileInputGlobalMethodsTest):
      """Unit tests for fileinput.filename()"""
  
      def test_state_is_None(self):
          """Tests fileinput.filename() when fileinput._state is None.
             Ensure that it raises RuntimeError with a meaningful error message
             and does not modify fileinput._state"""
          fileinput._state = None
          with self.assertRaises(RuntimeError) as cm:
              fileinput.filename()
          self.assertEqual(("no active input()",), cm.exception.args)
          self.assertIsNone(fileinput._state)
  
      def test_state_is_not_None(self):
          """Tests fileinput.filename() when fileinput._state is not None.
             Ensure that it invokes fileinput._state.filename() exactly once,
             returns whatever it returns, and does not modify fileinput._state
             to point to a different object."""
          filename_retval = object()
          instance = MockFileInput()
          instance.return_values["filename"] = filename_retval
          fileinput._state = instance
          retval = fileinput.filename()
          self.assertExactlyOneInvocation(instance, "filename")
          self.assertIs(retval, filename_retval)
          self.assertIs(fileinput._state, instance)
  
  class Test_fileinput_lineno(BaseFileInputGlobalMethodsTest):
      """Unit tests for fileinput.lineno()"""
  
      def test_state_is_None(self):
          """Tests fileinput.lineno() when fileinput._state is None.
             Ensure that it raises RuntimeError with a meaningful error message
             and does not modify fileinput._state"""
          fileinput._state = None
          with self.assertRaises(RuntimeError) as cm:
              fileinput.lineno()
          self.assertEqual(("no active input()",), cm.exception.args)
          self.assertIsNone(fileinput._state)
  
      def test_state_is_not_None(self):
          """Tests fileinput.lineno() when fileinput._state is not None.
             Ensure that it invokes fileinput._state.lineno() exactly once,
             returns whatever it returns, and does not modify fileinput._state
             to point to a different object."""
          lineno_retval = object()
          instance = MockFileInput()
          instance.return_values["lineno"] = lineno_retval
          fileinput._state = instance
          retval = fileinput.lineno()
          self.assertExactlyOneInvocation(instance, "lineno")
          self.assertIs(retval, lineno_retval)
          self.assertIs(fileinput._state, instance)
  
  class Test_fileinput_filelineno(BaseFileInputGlobalMethodsTest):
      """Unit tests for fileinput.filelineno()"""
  
      def test_state_is_None(self):
          """Tests fileinput.filelineno() when fileinput._state is None.
             Ensure that it raises RuntimeError with a meaningful error message
             and does not modify fileinput._state"""
          fileinput._state = None
          with self.assertRaises(RuntimeError) as cm:
              fileinput.filelineno()
          self.assertEqual(("no active input()",), cm.exception.args)
          self.assertIsNone(fileinput._state)
  
      def test_state_is_not_None(self):
          """Tests fileinput.filelineno() when fileinput._state is not None.
             Ensure that it invokes fileinput._state.filelineno() exactly once,
             returns whatever it returns, and does not modify fileinput._state
             to point to a different object."""
          filelineno_retval = object()
          instance = MockFileInput()
          instance.return_values["filelineno"] = filelineno_retval
          fileinput._state = instance
          retval = fileinput.filelineno()
          self.assertExactlyOneInvocation(instance, "filelineno")
          self.assertIs(retval, filelineno_retval)
          self.assertIs(fileinput._state, instance)
  
  class Test_fileinput_fileno(BaseFileInputGlobalMethodsTest):
      """Unit tests for fileinput.fileno()"""
  
      def test_state_is_None(self):
          """Tests fileinput.fileno() when fileinput._state is None.
             Ensure that it raises RuntimeError with a meaningful error message
             and does not modify fileinput._state"""
          fileinput._state = None
          with self.assertRaises(RuntimeError) as cm:
              fileinput.fileno()
          self.assertEqual(("no active input()",), cm.exception.args)
          self.assertIsNone(fileinput._state)
  
      def test_state_is_not_None(self):
          """Tests fileinput.fileno() when fileinput._state is not None.
             Ensure that it invokes fileinput._state.fileno() exactly once,
             returns whatever it returns, and does not modify fileinput._state
             to point to a different object."""
          fileno_retval = object()
          instance = MockFileInput()
          instance.return_values["fileno"] = fileno_retval
          instance.fileno_retval = fileno_retval
          fileinput._state = instance
          retval = fileinput.fileno()
          self.assertExactlyOneInvocation(instance, "fileno")
          self.assertIs(retval, fileno_retval)
          self.assertIs(fileinput._state, instance)
  
  class Test_fileinput_isfirstline(BaseFileInputGlobalMethodsTest):
      """Unit tests for fileinput.isfirstline()"""
  
      def test_state_is_None(self):
          """Tests fileinput.isfirstline() when fileinput._state is None.
             Ensure that it raises RuntimeError with a meaningful error message
             and does not modify fileinput._state"""
          fileinput._state = None
          with self.assertRaises(RuntimeError) as cm:
              fileinput.isfirstline()
          self.assertEqual(("no active input()",), cm.exception.args)
          self.assertIsNone(fileinput._state)
  
      def test_state_is_not_None(self):
          """Tests fileinput.isfirstline() when fileinput._state is not None.
             Ensure that it invokes fileinput._state.isfirstline() exactly once,
             returns whatever it returns, and does not modify fileinput._state
             to point to a different object."""
          isfirstline_retval = object()
          instance = MockFileInput()
          instance.return_values["isfirstline"] = isfirstline_retval
          fileinput._state = instance
          retval = fileinput.isfirstline()
          self.assertExactlyOneInvocation(instance, "isfirstline")
          self.assertIs(retval, isfirstline_retval)
          self.assertIs(fileinput._state, instance)
  
  class Test_fileinput_isstdin(BaseFileInputGlobalMethodsTest):
      """Unit tests for fileinput.isstdin()"""
  
      def test_state_is_None(self):
          """Tests fileinput.isstdin() when fileinput._state is None.
             Ensure that it raises RuntimeError with a meaningful error message
             and does not modify fileinput._state"""
          fileinput._state = None
          with self.assertRaises(RuntimeError) as cm:
              fileinput.isstdin()
          self.assertEqual(("no active input()",), cm.exception.args)
          self.assertIsNone(fileinput._state)
  
      def test_state_is_not_None(self):
          """Tests fileinput.isstdin() when fileinput._state is not None.
             Ensure that it invokes fileinput._state.isstdin() exactly once,
             returns whatever it returns, and does not modify fileinput._state
             to point to a different object."""
          isstdin_retval = object()
          instance = MockFileInput()
          instance.return_values["isstdin"] = isstdin_retval
          fileinput._state = instance
          retval = fileinput.isstdin()
          self.assertExactlyOneInvocation(instance, "isstdin")
          self.assertIs(retval, isstdin_retval)
          self.assertIs(fileinput._state, instance)
  
  class InvocationRecorder:
      def __init__(self):
          self.invocation_count = 0
      def __call__(self, *args, **kwargs):
          self.invocation_count += 1
          self.last_invocation = (args, kwargs)
  
  class Test_hook_compressed(unittest.TestCase):
      """Unit tests for fileinput.hook_compressed()"""
  
      def setUp(self):
          self.fake_open = InvocationRecorder()
  
      def test_empty_string(self):
          self.do_test_use_builtin_open("", 1)
  
      def test_no_ext(self):
          self.do_test_use_builtin_open("abcd", 2)
  
      @unittest.skipUnless(gzip, "Requires gzip and zlib")
      def test_gz_ext_fake(self):
          original_open = gzip.open
          gzip.open = self.fake_open
          try:
              result = fileinput.hook_compressed("test.gz", 3)
          finally:
              gzip.open = original_open
  
          self.assertEqual(self.fake_open.invocation_count, 1)
          self.assertEqual(self.fake_open.last_invocation, (("test.gz", 3), {}))
  
      @unittest.skipUnless(bz2, "Requires bz2")
      def test_bz2_ext_fake(self):
          original_open = bz2.BZ2File
          bz2.BZ2File = self.fake_open
          try:
              result = fileinput.hook_compressed("test.bz2", 4)
          finally:
              bz2.BZ2File = original_open
  
          self.assertEqual(self.fake_open.invocation_count, 1)
          self.assertEqual(self.fake_open.last_invocation, (("test.bz2", 4), {}))
  
      def test_blah_ext(self):
          self.do_test_use_builtin_open("abcd.blah", 5)
  
      def test_gz_ext_builtin(self):
          self.do_test_use_builtin_open("abcd.Gz", 6)
  
      def test_bz2_ext_builtin(self):
          self.do_test_use_builtin_open("abcd.Bz2", 7)
  
      def do_test_use_builtin_open(self, filename, mode):
          original_open = self.replace_builtin_open(self.fake_open)
          try:
              result = fileinput.hook_compressed(filename, mode)
          finally:
              self.replace_builtin_open(original_open)
  
          self.assertEqual(self.fake_open.invocation_count, 1)
          self.assertEqual(self.fake_open.last_invocation,
                           ((filename, mode), {}))
  
      @staticmethod
      def replace_builtin_open(new_open_func):
          original_open = builtins.open
          builtins.open = new_open_func
          return original_open
  
  class Test_hook_encoded(unittest.TestCase):
      """Unit tests for fileinput.hook_encoded()"""
  
      def test(self):
          encoding = object()
          errors = object()
          result = fileinput.hook_encoded(encoding, errors=errors)
  
          fake_open = InvocationRecorder()
          original_open = builtins.open
          builtins.open = fake_open
          try:
              filename = object()
              mode = object()
              open_result = result(filename, mode)
          finally:
              builtins.open = original_open
  
          self.assertEqual(fake_open.invocation_count, 1)
  
          args, kwargs = fake_open.last_invocation
          self.assertIs(args[0], filename)
          self.assertIs(args[1], mode)
          self.assertIs(kwargs.pop('encoding'), encoding)
          self.assertIs(kwargs.pop('errors'), errors)
          self.assertFalse(kwargs)
  
      def test_errors(self):
          with open(TESTFN, 'wb') as f:
              f.write(b'\x80abc')
          self.addCleanup(safe_unlink, TESTFN)
  
          def check(errors, expected_lines):
              with FileInput(files=TESTFN, mode='r',
                             openhook=hook_encoded('utf-8', errors=errors)) as fi:
                  lines = list(fi)
              self.assertEqual(lines, expected_lines)
  
          check('ignore', ['abc'])
          with self.assertRaises(UnicodeDecodeError):
              check('strict', ['abc'])
          check('replace', ['\ufffdabc'])
          check('backslashreplace', ['\\x80abc'])
  
      def test_modes(self):
          with open(TESTFN, 'wb') as f:
              # UTF-7 is a convenient, seldom used encoding
              f.write(b'A\nB\r\nC\rD+IKw-')
          self.addCleanup(safe_unlink, TESTFN)
  
          def check(mode, expected_lines):
              with FileInput(files=TESTFN, mode=mode,
                             openhook=hook_encoded('utf-7')) as fi:
                  lines = list(fi)
              self.assertEqual(lines, expected_lines)
  
          check('r', ['A\n', 'B\n', 'C\n', 'D\u20ac'])
          with self.assertWarns(DeprecationWarning):
              check('rU', ['A\n', 'B\n', 'C\n', 'D\u20ac'])
          with self.assertWarns(DeprecationWarning):
              check('U', ['A\n', 'B\n', 'C\n', 'D\u20ac'])
          with self.assertRaises(ValueError):
              check('rb', ['A\n', 'B\r\n', 'C\r', 'D\u20ac'])
  
  
  class MiscTest(unittest.TestCase):
  
      def test_all(self):
          support.check__all__(self, fileinput)
  
  
  if __name__ == "__main__":
      unittest.main()
  