--- test_gzip.py.orig	2007-03-09 09:54:41.000000000 +0100
+++ test_gzip.py	2007-03-09 10:16:54.000000000 +0100
@@ -20,6 +20,16 @@
 /* See http://www.winimage.com/zLibDll for Windows */
 """
 
+class InputStream:
+    """Restrict a File to reading only"""
+    
+    def __init__(self, f, testcase):
+        self.testcase = testcase
+        self.read = f.read
+        self.close = f.close
+
+    def __getattr__(self, name):
+        self.testcase.fail("Trying to use '%s' attribute of the file object" % name)
 
 class TestGzip(unittest.TestCase):
     filename = test_support.TESTFN
@@ -54,8 +64,9 @@
         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()
+        # wrap file into InputStream to make shure that read() doesn't seek()
+        f_ = InputStream(open(self.filename, 'rb'), self)
+        f = gzip.GzipFile(fileobj=f_) ; d = f.read() ; f.close()
         self.assertEqual(d, (data1*50) + (data2*15))
 
     def test_many_append(self):
@@ -85,7 +96,10 @@
         self.test_write()
         # Try .readline() with varying line lengths
 
-        f = gzip.GzipFile(self.filename, 'rb')
+        # wrap file into InputStream to make shure that
+        # readline() doesn't seek()
+        f_ = InputStream(open(self.filename, 'rb'), self)
+        f = gzip.GzipFile(fileobj = f_)
         line_length = 0
         while 1:
             L = f.readline(line_length)