Index: Lib/test/test_fileio.py
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- Lib/test/test_fileio.py	(revision 8156:623eaa3d7834cf8ac04cf420ecb9f40a1f37707b)
+++ Lib/test/test_fileio.py	(revision 8156+:623eaa3d7834+)
@@ -57,6 +57,30 @@
         self.assertEqual(self.f.tell(), 10)
         self.f.seek(-5, 2)
         self.assertEqual(self.f.tell(), 15)
+        # Adding seek read/readline text
+        self.f.write(b'Jython is great\n')
+        self.f.close()
+        self.f = open(TESTFN)
+        self.f.read()
+        self.assertEqual(self.f.tell(), 31)
+        self.f.seek(-10, 1)
+        self.assertEqual(self.f.tell(), 21)
+        self.f.seek(5, 1)
+        self.assertEqual(self.f.tell(), 26)
+        self.f.seek(0)
+        self.f.readline()
+        # Should be 31, but tell() 'expects' 11L and fails.
+        self.assertEqual(self.f.tell(), 31)
+        self.f.seek(-10, 1)
+        # If previous tell() is really 11, this should pass at 1.
+        # However, this tell() is correct, the real result is 31 - 10 = 21
+        self.assertEqual(self.f.tell(), 21)
+        self.f.seek(5, 1)
+        self.assertEqual(self.f.tell(), 26)
+
+
+
+
 
     def testAttributes(self):
         # verify expected attributes exist