Skip some tests in the absence of multiprocessing.

Lib/test/test_logging.py

@@ -2504,6 +2504,7 @@ class ConfigDictTest(BaseTest):
             logging.config.stopListening()
             t.join(2.0)
 
+    @unittest.skipUnless(threading, 'Threading required for this test.')
     def test_listen_config_10_ok(self):
         with captured_stdout() as output:
             self.setup_via_listener(json.dumps(self.config10))
@@ -2523,6 +2524,7 @@ class ConfigDictTest(BaseTest):
                 ('ERROR', '4'),
             ], stream=output)
 
+    @unittest.skipUnless(threading, 'Threading required for this test.')
     def test_listen_config_1_ok(self):
         with captured_stdout() as output:
             self.setup_via_listener(textwrap.dedent(ConfigFileTest.config1))
@@ -3062,15 +3064,19 @@ class LogRecordTest(BaseTest):
     def test_multiprocessing(self):
         r = logging.makeLogRecord({})
         self.assertEqual(r.processName, 'MainProcess')
-        import multiprocessing as mp
-        r = logging.makeLogRecord({})
-        self.assertEqual(r.processName, mp.current_process().name)
+        try:
+            import multiprocessing as mp
+            r = logging.makeLogRecord({})
+            self.assertEqual(r.processName, mp.current_process().name)
+        except ImportError:
+            pass
 
     def test_optional(self):
         r = logging.makeLogRecord({})
         NOT_NONE = self.assertIsNotNone
-        NOT_NONE(r.thread)
-        NOT_NONE(r.threadName)
+        if threading:
+            NOT_NONE(r.thread)
+            NOT_NONE(r.threadName)
         NOT_NONE(r.process)
         NOT_NONE(r.processName)
         log_threads = logging.logThreads