bpo-33723: Fix test_time.test_thread_time() (GH-10724)

miss-islington · vstinner · web-flow · commit 5350dd1b50e6 · 2018-11-26T12:36:54.000-08:00
Tolerate up to 30 ms, instead of 15 min, in other threads. (cherry picked from commit 65c216e) Co-authored-by: Victor Stinner <vstinner@redhat.com>
diff --git a/Lib/test/test_time.py b/Lib/test/test_time.py
@@ -497,7 +497,8 @@ def test_process_time(self):
         self.assertLess(stop - start, 0.020)
 
         # bpo-33723: A busy loop of 100 ms should increase process_time()
-        # by at least 15 ms
+        # by at least 15 ms. Tolerate 15 ms because of the bad resolution of
+        # the clock on Windows (around 15.6 ms).
         min_time = 0.015
         busy_time = 0.100
 
@@ -535,8 +536,11 @@ def test_thread_time(self):
         self.assertLess(stop - start, 0.020)
 
         # bpo-33723: A busy loop of 100 ms should increase thread_time()
-        # by at least 15 ms
+        # by at least 15 ms, but less than 30 ms in other threads.
+        # Tolerate 15 and 30 ms because of the bad resolution
+        # of the clock on Windows (around 15.6 ms).
         min_time = 0.015
+        max_time = 0.030
         busy_time = 0.100
 
         # thread_time() should include CPU time spent in current thread...
@@ -551,7 +555,7 @@ def test_thread_time(self):
         t.start()
         t.join()
         stop = time.thread_time()
-        self.assertLess(stop - start, min_time)
+        self.assertLess(stop - start, max_time)
 
         info = time.get_clock_info('thread_time')
         self.assertTrue(info.monotonic)
