/Lib/test/test_gzip.py

  1#! /usr/bin/env python
  2"""Test script for the gzip module.
  3"""
  4
  5import unittest
  6from test import test_support
  7import os
  8import gzip
  9
 10
 11data1 = """  int length=DEFAULTALLOC, err = Z_OK;
 12  PyObject *RetVal;
 13  int flushmode = Z_FINISH;
 14  unsigned long start_total_out;
 15
 16"""
 17
 18data2 = """/* zlibmodule.c -- gzip-compatible data compression */
 19/* See http://www.gzip.org/zlib/
 20/* See http://www.winimage.com/zLibDll for Windows */
 21"""
 22
 23
 24class TestGzip(unittest.TestCase):
 25    filename = test_support.TESTFN
 26
 27    def setUp(self):
 28        test_support.unlink(self.filename)
 29
 30    def tearDown(self):
 31        test_support.unlink(self.filename)
 32
 33
 34    def test_write(self):
 35        f = gzip.GzipFile(self.filename, 'wb') ; f.write(data1 * 50)
 36
 37        # Try flush and fileno.
 38        f.flush()
 39        f.fileno()
 40        if hasattr(os, 'fsync'):
 41            os.fsync(f.fileno())
 42        f.close()
 43
 44        # Test multiple close() calls.
 45        f.close()
 46
 47    def test_read(self):
 48        self.test_write()
 49        # Try reading.
 50        f = gzip.GzipFile(self.filename, 'r') ; d = f.read() ; f.close()
 51        self.assertEqual(d, data1*50)
 52
 53    def test_append(self):
 54        self.test_write()
 55        # Append to the previous file
 56        f = gzip.GzipFile(self.filename, 'ab') ; f.write(data2 * 15) ; f.close()
 57
 58        f = gzip.GzipFile(self.filename, 'rb') ; d = f.read() ; f.close()
 59        self.assertEqual(d, (data1*50) + (data2*15))
 60
 61    def test_many_append(self):
 62        # Bug #1074261 was triggered when reading a file that contained
 63        # many, many members.  Create such a file and verify that reading it
 64        # works.
 65        f = gzip.open(self.filename, 'wb', 9)
 66        f.write('a')
 67        f.close()
 68        for i in range(0,200):
 69            f = gzip.open(self.filename, "ab", 9) # append
 70            f.write('a')
 71            f.close()
 72
 73        # Try reading the file
 74        zgfile = gzip.open(self.filename, "rb")
 75        contents = ""
 76        while 1:
 77            ztxt = zgfile.read(8192)
 78            contents += ztxt
 79            if not ztxt: break
 80        zgfile.close()
 81        self.assertEquals(contents, 'a'*201)
 82
 83
 84    def test_readline(self):
 85        self.test_write()
 86        # Try .readline() with varying line lengths
 87
 88        f = gzip.GzipFile(self.filename, 'rb')
 89        line_length = 0
 90        while 1:
 91            L = f.readline(line_length)
 92            if L == "" and line_length != 0: break
 93            self.assert_(len(L) <= line_length)
 94            line_length = (line_length + 1) % 50
 95        f.close()
 96
 97    def test_readlines(self):
 98        self.test_write()
 99        # Try .readlines()
100
101        f = gzip.GzipFile(self.filename, 'rb')
102        L = f.readlines()
103        f.close()
104
105        f = gzip.GzipFile(self.filename, 'rb')
106        while 1:
107            L = f.readlines(150)
108            if L == []: break
109        f.close()
110
111    def test_seek_read(self):
112        self.test_write()
113        # Try seek, read test
114
115        f = gzip.GzipFile(self.filename)
116        while 1:
117            oldpos = f.tell()
118            line1 = f.readline()
119            if not line1: break
120            newpos = f.tell()
121            f.seek(oldpos)  # negative seek
122            if len(line1)>10:
123                amount = 10
124            else:
125                amount = len(line1)
126            line2 = f.read(amount)
127            self.assertEqual(line1[:amount], line2)
128            f.seek(newpos)  # positive seek
129        f.close()
130
131    def test_seek_whence(self):
132        self.test_write()
133        # Try seek(whence=1), read test
134
135        f = gzip.GzipFile(self.filename)
136        f.read(10)
137        f.seek(10, whence=1)
138        y = f.read(10)
139        f.close()
140        self.assertEquals(y, data1[20:30])
141
142    def test_seek_write(self):
143        # Try seek, write test
144        f = gzip.GzipFile(self.filename, 'w')
145        for pos in range(0, 256, 16):
146            f.seek(pos)
147            f.write('GZ\n')
148        f.close()
149
150    def test_mode(self):
151        self.test_write()
152        f = gzip.GzipFile(self.filename, 'r')
153        self.assertEqual(f.myfileobj.mode, 'rb')
154        f.close()
155
156    def test_1647484(self):
157        for mode in ('wb', 'rb'):
158            f = gzip.GzipFile(self.filename, mode)
159            self.assert_(hasattr(f, "name"))
160            self.assertEqual(f.name, self.filename)
161            f.close()
162
163def test_main(verbose=None):
164    test_support.run_unittest(TestGzip)
165
166if __name__ == "__main__":
167    test_main(verbose=True)