Add even more tests on architecture()

Author: vstinner

Lib/test/test_platform.py

@@ -119,7 +119,9 @@ def test_invalidate_caches(self):
             self.assertIsNone(platform._os_release_cache)
 
     def test_architecture(self):
-        res = platform.architecture()
+        bits, linkage = platform.architecture()
+        self.assertIsInstance(bits, str)
+        self.assertIsInstance(linkage, str)
 
         if support.MS_WINDOWS:
             for sysconfig_platform, expected_bits in (