Added fast alternate io.BytesIO implementation and its test suite.

Removed old test suite for StringIO.
Modified truncate() to imply a seek to given argument value.

1 files changed, 4 insertions, 3 deletions

diff --git a/Lib/test/test_largefile.py b/Lib/test/test_largefile.py
index 4cafe33..0856346 100644
--- a/Lib/test/test_largefile.py
+++ b/Lib/test/test_largefile.py
@@ -120,14 +120,15 @@ class TestCase(unittest.TestCase):
             newsize -= 1
             f.seek(42)
             f.truncate(newsize)
-            self.assertEqual(f.tell(), 42)       # else pointer moved
-            f.seek(0, 2)
             self.assertEqual(f.tell(), newsize)  # else wasn't truncated
+            f.seek(0, 2)
+            self.assertEqual(f.tell(), newsize)
             # XXX truncate(larger than true size) is ill-defined
             # across platform; cut it waaaaay back
             f.seek(0)
             f.truncate(1)
-            self.assertEqual(f.tell(), 0)       # else pointer moved
+            self.assertEqual(f.tell(), 1)       # else pointer moved
+            f.seek(0)
             self.assertEqual(len(f.read()), 1)  # else wasn't truncated
 
 def test_main():