update test according to comments

Author: chaope

Lib/test/test_unittest/testmock/testthreadingmock.py

@@ -1,9 +1,10 @@
+import sys
 import time
 import unittest
 import threading
 import concurrent.futures
 
-from test.support import requires_resource, threading_helper
+from test.support import setswitchinterval, threading_helper
 from unittest.mock import patch, ThreadingMock
 
 
@@ -197,20 +198,24 @@ def test_reset_mock_resets_wait(self):
         m.wait_until_any_call_with()
         m.assert_called_once()
 
-    @requires_resource('cpu')
     def test_call_count_thread_safe(self):
-        m = ThreadingMock()
-        # 3k loops reliably reproduces the issue while keeping runtime ~0.6s
-        LOOPS = 3_000
-        THREADS = 10
-        def test_function():
-            for _ in range(LOOPS):
-                m()
-        threads = [threading.Thread(target=test_function) for _ in range(THREADS)]
-        for thread in threads:
-            thread.start()
-        for thread in threads:
-            thread.join()
+        oldswitchinterval = sys.getswitchinterval()
+        setswitchinterval(1e-6)
+        try:
+            m = ThreadingMock()
+            # 100 loops with 10 threads reliably reproduces the issue while keeping runtime ~0.2s
+            LOOPS = 100
+            THREADS = 10
+            def test_function():
+                for _ in range(LOOPS):
+                    m()
+            threads = [threading.Thread(target=test_function) for _ in range(THREADS)]
+            for thread in threads:
+                thread.start()
+            for thread in threads:
+                thread.join()
+        finally:
+            sys.setswitchinterval(oldswitchinterval)
 
         self.assertEqual(m.call_count, LOOPS * THREADS)