Index: Lib/test/test_posix.py
===================================================================
--- Lib/test/test_posix.py	(revision 62989)
+++ Lib/test/test_posix.py	(working copy)
@@ -49,6 +49,7 @@
             fp = open(test_support.TESTFN)
             try:
                 self.assert_(posix.fstatvfs(fp.fileno()))
+                self.assert_(posix.fstatvfs(fp))
             finally:
                 fp.close()
 
@@ -62,7 +63,15 @@
                 posix.ftruncate(fp.fileno(), 0)
             finally:
                 fp.close()
+            fp = open(test_support.TESTFN, 'w+')
+            try:
+                fp.write('test')
+                fp.flush()
+                posix.ftruncate(fp, 0)
+            finally:
+                fp.close()
 
+
     def test_dup(self):
         if hasattr(posix, 'dup'):
             fp = open(test_support.TESTFN)
@@ -72,7 +81,15 @@
                 os.close(fd)
             finally:
                 fp.close()
+            fp = open(test_support.TESTFN)
+            try:
+                fd = posix.dup(fp)
+                self.assert_(isinstance(fd, int))
+                os.close(fd)
+            finally:
+                fp.close()
 
+
     def test_confstr(self):
         if hasattr(posix, 'confstr'):
             self.assertRaises(ValueError, posix.confstr, "CS_garbage")
@@ -135,6 +152,7 @@
             fp = open(test_support.TESTFN)
             try:
                 self.assert_(posix.fstat(fp.fileno()))
+                self.assert_(posix.fstat(fp))
             finally:
                 fp.close()