unittests test_sched skip if threads not enabled

Author: cosminbasca

graalpython/lib-python/3/test/test_sched.py

@@ -58,6 +58,7 @@ def test_enterabs(self):
         scheduler.run()
         self.assertEqual(l, [0.01, 0.02, 0.03, 0.04, 0.05])
 
+    @unittest.skipIfGraalPythonWitoutThreads
     @unittest.skipUnless(threading, 'Threading required for this test.')
     def test_enter_concurrent(self):
         q = queue.Queue()
@@ -113,6 +114,7 @@ def test_cancel(self):
         scheduler.run()
         self.assertEqual(l, [0.02, 0.03, 0.04])
 
+    @unittest.skipIfGraalPythonWitoutThreads
     @unittest.skipUnless(threading, 'Threading required for this test.')
     def test_cancel_concurrent(self):
         q = queue.Queue()