convert old fail* assertions to assert*
diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
index 8d1bb59..294b302 100644
--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -42,13 +42,13 @@
 
     def test_statvfs(self):
         if hasattr(posix, 'statvfs'):
-            self.assert_(posix.statvfs(os.curdir))
+            self.assertTrue(posix.statvfs(os.curdir))
 
     def test_fstatvfs(self):
         if hasattr(posix, 'fstatvfs'):
             fp = open(support.TESTFN)
             try:
-                self.assert_(posix.fstatvfs(fp.fileno()))
+                self.assertTrue(posix.fstatvfs(fp.fileno()))
             finally:
                 fp.close()
 
@@ -68,7 +68,7 @@
             fp = open(support.TESTFN)
             try:
                 fd = posix.dup(fp.fileno())
-                self.assert_(isinstance(fd, int))
+                self.assertTrue(isinstance(fd, int))
                 os.close(fd)
             finally:
                 fp.close()
@@ -123,13 +123,13 @@
         if hasattr(posix, 'fstat'):
             fp = open(support.TESTFN)
             try:
-                self.assert_(posix.fstat(fp.fileno()))
+                self.assertTrue(posix.fstat(fp.fileno()))
             finally:
                 fp.close()
 
     def test_stat(self):
         if hasattr(posix, 'stat'):
-            self.assert_(posix.stat(support.TESTFN))
+            self.assertTrue(posix.stat(support.TESTFN))
 
     if hasattr(posix, 'chown'):
         def test_chown(self):
@@ -165,21 +165,21 @@
 
     def test_lsdir(self):
         if hasattr(posix, 'lsdir'):
-            self.assert_(support.TESTFN in posix.lsdir(os.curdir))
+            self.assertTrue(support.TESTFN in posix.lsdir(os.curdir))
 
     def test_access(self):
         if hasattr(posix, 'access'):
-            self.assert_(posix.access(support.TESTFN, os.R_OK))
+            self.assertTrue(posix.access(support.TESTFN, os.R_OK))
 
     def test_umask(self):
         if hasattr(posix, 'umask'):
             old_mask = posix.umask(0)
-            self.assert_(isinstance(old_mask, int))
+            self.assertTrue(isinstance(old_mask, int))
             posix.umask(old_mask)
 
     def test_strerror(self):
         if hasattr(posix, 'strerror'):
-            self.assert_(posix.strerror(0))
+            self.assertTrue(posix.strerror(0))
 
     def test_pipe(self):
         if hasattr(posix, 'pipe'):