commit abb7e6504291506fee695ad56a642d0dea6370e4
author Serhiy Storchaka <storchaka@gmail.com> Thu Apr 16 11:56:35 2015 +0300
committer Serhiy Storchaka <storchaka@gmail.com> Thu Apr 16 11:56:35 2015 +0300
tree be68007bd9263eda19ff72cc834f34f67b823bf8
parent 6d12c80c91f4bad809a610fe8df03c1b1e65c9fa

Backported tests from issue #20175.

Lib/test/test_io.py

diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 2914a80..bbc804b 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -1990,6 +1990,17 @@
         self.assertRaises(TypeError, t.__init__, b, newline=42)
         self.assertRaises(ValueError, t.__init__, b, newline='xyzzy')
 
+    def test_uninitialized(self):
+        t = self.TextIOWrapper.__new__(self.TextIOWrapper)
+        del t
+        t = self.TextIOWrapper.__new__(self.TextIOWrapper)
+        self.assertRaises(Exception, repr, t)
+        self.assertRaisesRegexp((ValueError, AttributeError),
+                                'uninitialized|has no attribute',
+                                t.read, 0)
+        t.__init__(self.MockRawIO())
+        self.assertEqual(t.read(0), u'')
+
     def test_detach(self):
         r = self.BytesIO()
         b = self.BufferedWriter(r)