SW-815: fixed typo

SAS/ResourceAssignment/TaskPrescheduler/test/test_taskprescheduler.py

@@ -306,7 +306,7 @@ class PreschedulerTest(unittest.TestCase):
         self.assertEqual(cobalt_settings, self.test_cobalt_settings)
         self.assertEqual(int, type(cobalt_settings['blockSize']))
         self.assertEqual(int, type(cobalt_settings['nrBlocks']))
-        self.assertEqual(int, type(cobalt_settings['nrSubBlocks']))
+        self.assertEqual(int, type(cobalt_settings['nrSubblocks']))
 
     def test_calculateCobaltSettingsAndConvertToOTDBsettings(self):
         '''combination of test_CobaltOTDBsettings and test_calculateCobaltSettings