Issue 19572: More silently skipped tests explicitly skipped.
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index 601c6b2..b5bfe94 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -263,7 +263,7 @@
         except OSError as e:
             # On AtheOS, glibc always returns ENOSYS
             if e.errno == errno.ENOSYS:
-                return
+                self.skipTest('glibc always returns ENOSYS on AtheOS')
 
         # Make sure direct access works
         self.assertEqual(result.f_bfree, result[3])
@@ -480,7 +480,7 @@
             os.stat(r"c:\pagefile.sys")
         except WindowsError as e:
             if e.errno == 2: # file does not exist; cannot run test
-                return
+                self.skipTest(r'c:\pagefile.sys does not exist')
             self.fail("Could not stat pagefile.sys")
 
     @unittest.skipUnless(sys.platform == "win32", "Win32 specific tests")