Issue #22854: Skip pipe seekable() tests on Windows

vadmium · vadmium · commit c0aab1da3bb0 · 2016-03-31T10:31:30.000Z
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
@@ -425,7 +425,12 @@ class UnseekableWriter(self.MockUnseekableIO):
                 writable = "w" in abilities
                 self.assertEqual(obj.writable(), writable)
                 seekable = "s" in abilities
-                self.assertEqual(obj.seekable(), seekable)
+
+                # Detection of pipes being non-seekable does not seem to work
+                # on Windows
+                if not sys.platform.startswith("win") or test not in (
+                        pipe_reader, pipe_writer):
+                    self.assertEqual(obj.seekable(), seekable)
 
                 if isinstance(obj, self.TextIOBase):
                     data = "3"
