Issue 19572: More silently skipped tests explicitly skipped.

Lib/test/test_fileio.py

@@ -341,8 +341,7 @@ class OtherFileTests(unittest.TestCase):
         try:
             fn = TESTFN.encode("ascii")
         except UnicodeEncodeError:
-            # Skip test
-            return
+            self.skipTest('could not encode %r to ascii' % TESTFN)
         f = _FileIO(fn, "w")
         try:
             f.write(b"abc")