backport r67300

1 files changed, 31 insertions, 0 deletions

diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 9ef2a818b3..378d994640 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -1225,6 +1225,9 @@ class TextIOWrapperTest(unittest.TestCase):
 
 class MiscIOTest(unittest.TestCase):
 
+    def tearDown(self):
+        test_support.unlink(test_support.TESTFN)
+
     def testImport__all__(self):
         for name in io.__all__:
             obj = getattr(io, name, None)
@@ -1237,6 +1240,34 @@ class MiscIOTest(unittest.TestCase):
                 self.assert_(issubclass(obj, io.IOBase))
 
 
+    def test_attributes(self):
+        f = io.open(test_support.TESTFN, "wb", buffering=0)
+        self.assertEquals(f.mode, "w")
+        f.close()
+
+        f = io.open(test_support.TESTFN, "U")
+        self.assertEquals(f.name,            test_support.TESTFN)
+        self.assertEquals(f.buffer.name,     test_support.TESTFN)
+        self.assertEquals(f.buffer.raw.name, test_support.TESTFN)
+        self.assertEquals(f.mode,            "U")
+        self.assertEquals(f.buffer.mode,     "r")
+        self.assertEquals(f.buffer.raw.mode, "r")
+        f.close()
+
+        f = io.open(test_support.TESTFN, "w+")
+        self.assertEquals(f.mode,            "w+")
+        self.assertEquals(f.buffer.mode,     "r+") # Does it really matter?
+        self.assertEquals(f.buffer.raw.mode, "r+")
+
+        g = io.open(f.fileno(), "wb", closefd=False)
+        self.assertEquals(g.mode,     "w")
+        self.assertEquals(g.raw.mode, "w")
+        self.assertEquals(g.name,     f.fileno())
+        self.assertEquals(g.raw.name, f.fileno())
+        f.close()
+        g.close()
+
+
 def test_main():
     test_support.run_unittest(IOTest, BytesIOTest, StringIOTest,
                               BufferedReaderTest, BufferedWriterTest,