patch up leaking fds

Lib/test/test_io.py

@@ -555,6 +555,7 @@ class IOTest(unittest.TestCase):
     def test_garbage_collection(self):
         # FileIO objects are collected, and collecting them flushes
         # all data to disk.
+        with support.check_warnings(('', ResourceWarning)):
             f = self.FileIO(support.TESTFN, "wb")
             f.write(b"abcxxx")
             f.f = f
@@ -1984,10 +1985,9 @@ class TextIOWrapperTest(unittest.TestCase):
         u_suffix = "\u8888\n"
         suffix = bytes(u_suffix.encode("utf-8"))
         line = prefix + suffix
-        f = self.open(support.TESTFN, "wb")
+        with self.open(support.TESTFN, "wb") as f:
             f.write(line*2)
-        f.close()
-        f = self.open(support.TESTFN, "r", encoding="utf-8")
+        with self.open(support.TESTFN, "r", encoding="utf-8") as f:
             s = f.read(prefix_size)
             self.assertEquals(s, str(prefix, "ascii"))
             self.assertEquals(f.tell(), prefix_size)
@@ -1996,10 +1996,9 @@ class TextIOWrapperTest(unittest.TestCase):
     def test_seeking_too(self):
         # Regression test for a specific bug
         data = b'\xe0\xbf\xbf\n'
-        f = self.open(support.TESTFN, "wb")
+        with self.open(support.TESTFN, "wb") as f:
             f.write(data)
-        f.close()
-        f = self.open(support.TESTFN, "r", encoding="utf-8")
+        with self.open(support.TESTFN, "r", encoding="utf-8") as f:
             f._CHUNK_SIZE  # Just test that it exists
             f._CHUNK_SIZE = 2
             f.readline()