text: #! /usr/bin/env python
  """Test script for the gzip module.
  """
  
  import unittest
  from test import support
  import os
  import gzip
  
  
  data1 = b"""  int length=DEFAULTALLOC, err = Z_OK;
    PyObject *RetVal;
    int flushmode = Z_FINISH;
    unsigned long start_total_out;
  
  """
  
  data2 = b"""/* zlibmodule.c -- gzip-compatible data compression */
  /* See http://www.gzip.org/zlib/
  /* See http://www.winimage.com/zLibDll for Windows */
  """
  
  
  class TestGzip(unittest.TestCase):
      filename = support.TESTFN
  
      def setUp(self):
          support.unlink(self.filename)
  
      def tearDown(self):
          support.unlink(self.filename)
  
  
      def test_write(self):
          f = gzip.GzipFile(self.filename, 'wb') ; f.write(data1 * 50)
  
          # Try flush and fileno.
          f.flush()
          f.fileno()
          if hasattr(os, 'fsync'):
              os.fsync(f.fileno())
          f.close()
  
          # Test multiple close() calls.
          f.close()
  
      def test_read(self):
          self.test_write()
          # Try reading.
          f = gzip.GzipFile(self.filename, 'r') ; d = f.read() ; f.close()
          self.assertEqual(d, data1*50)
  
      def test_append(self):
          self.test_write()
          # Append to the previous file
          f = gzip.GzipFile(self.filename, 'ab') ; f.write(data2 * 15) ; f.close()
  
          f = gzip.GzipFile(self.filename, 'rb') ; d = f.read() ; f.close()
          self.assertEqual(d, (data1*50) + (data2*15))
  
      def test_many_append(self):
          # Bug #1074261 was triggered when reading a file that contained
          # many, many members.  Create such a file and verify that reading it
          # works.
          f = gzip.open(self.filename, 'wb', 9)
          f.write(b'a')
          f.close()
          for i in range(0, 200):
              f = gzip.open(self.filename, "ab", 9) # append
              f.write(b'a')
              f.close()
  
          # Try reading the file
          zgfile = gzip.open(self.filename, "rb")
          contents = b""
          while 1:
              ztxt = zgfile.read(8192)
              contents += ztxt
              if not ztxt: break
          zgfile.close()
          self.assertEquals(contents, b'a'*201)
  
  
      def test_readline(self):
          self.test_write()
          # Try .readline() with varying line lengths
  
          f = gzip.GzipFile(self.filename, 'rb')
          line_length = 0
          while 1:
              L = f.readline(line_length)
              if not L and line_length != 0: break
              self.assert_(len(L) <= line_length)
              line_length = (line_length + 1) % 50
          f.close()
  
      def test_readlines(self):
          self.test_write()
          # Try .readlines()
  
          f = gzip.GzipFile(self.filename, 'rb')
          L = f.readlines()
          f.close()
  
          f = gzip.GzipFile(self.filename, 'rb')
          while 1:
              L = f.readlines(150)
              if L == []: break
          f.close()
  
      def test_seek_read(self):
          self.test_write()
          # Try seek, read test
  
          f = gzip.GzipFile(self.filename)
          while 1:
              oldpos = f.tell()
              line1 = f.readline()
              if not line1: break
              newpos = f.tell()
              f.seek(oldpos)  # negative seek
              if len(line1)>10:
                  amount = 10
              else:
                  amount = len(line1)
              line2 = f.read(amount)
              self.assertEqual(line1[:amount], line2)
              f.seek(newpos)  # positive seek
          f.close()
  
      def test_seek_whence(self):
          self.test_write()
          # Try seek(whence=1), read test
  
          f = gzip.GzipFile(self.filename)
          f.read(10)
          f.seek(10, whence=1)
          y = f.read(10)
          f.close()
          self.assertEquals(y, data1[20:30])
  
      def test_seek_write(self):
          # Try seek, write test
          f = gzip.GzipFile(self.filename, 'w')
          for pos in range(0, 256, 16):
              f.seek(pos)
              f.write(b'GZ\n')
          f.close()
  
      def test_mode(self):
          self.test_write()
          f = gzip.GzipFile(self.filename, 'r')
          self.assertEqual(f.myfileobj.mode, 'rb')
          f.close()
  
      def test_1647484(self):
          for mode in ('wb', 'rb'):
              f = gzip.GzipFile(self.filename, mode)
              self.assert_(hasattr(f, "name"))
              self.assertEqual(f.name, self.filename)
              f.close()
  
  def test_main(verbose=None):
      support.run_unittest(TestGzip)
  
  if __name__ == "__main__":
      test_main(verbose=True)
  