Index: Lib/test/test_os.py
===================================================================
--- Lib/test/test_os.py	(revisione 88603)
+++ Lib/test/test_os.py	(copia locale)
@@ -1358,7 +1358,8 @@

     DATA = b"12345abcde" * 1024 * 1024  # 10 Mb
     SUPPORT_HEADERS_TRAILERS = not sys.platform.startswith("linux") and \
-                               not sys.platform.startswith("solaris")
+                               not sys.platform.startswith("solaris") and \
+                               not sys.platform.startswith("sunos")

     @classmethod
     def setUpClass(cls):