- Issue #6939: Fix file I/O objects in the `io` module to keep the original

  file position when calling `truncate()`.  It would previously change the
  file position to the given argument, which goes against the tradition of
  ftruncate() and other truncation APIs.  Patch by Pascal Chambon.

1 files changed, 2 insertions, 2 deletions

diff --git a/Lib/test/test_largefile.py b/Lib/test/test_largefile.py
index c4faeada21..16da8d8f17 100644
--- a/Lib/test/test_largefile.py
+++ b/Lib/test/test_largefile.py
@@ -125,7 +125,7 @@ class LargeFileTest(unittest.TestCase):
             f.seek(42)
             f.truncate(newsize)
             if self.new_io:
-                self.assertEqual(f.tell(), newsize)  # else wasn't truncated
+                self.assertEqual(f.tell(), 42)
             f.seek(0, 2)
             self.assertEqual(f.tell(), newsize)
             # XXX truncate(larger than true size) is ill-defined
@@ -133,7 +133,7 @@ class LargeFileTest(unittest.TestCase):
             f.seek(0)
             f.truncate(1)
             if self.new_io:
-                self.assertEqual(f.tell(), 1)       # else pointer moved
+                self.assertEqual(f.tell(), 0)       # else pointer moved
             f.seek(0)
             self.assertEqual(len(f.read()), 1)  # else wasn't truncated