TMSS-672: Add more tests for the 'at' constraint

SAS/TMSS/backend/services/scheduling/test/t_dynamic_scheduling.py

@@ -1103,7 +1103,7 @@ class TestTimeConstraints(TestCase):
 
     def test_can_run_within_at_constraint(self):
         """
-        Test "at" constraint
+        Test "at" constraint with both boundary and 'inside' upper_bound and lower_bound
         """
         # no constraints defined so should be OK
         self.clear_time_constraints()
@@ -1123,13 +1123,35 @@ class TestTimeConstraints(TestCase):
                                                                             datetime(2020, 1, 1, 12, 0, 0),
                                                                             datetime(2020, 1, 1, 14, 0, 0)))
 
+        # Set datetime constraint at upper_bound
+        self.clear_time_constraints()
+        self.add_time_at_constraint(datetime(2020, 1, 1, 14, 0, 0))
+        self.assertFalse(tc1.can_run_within_timewindow_with_time_constraints(self.scheduling_unit_blueprint,
+                                                                             datetime(2020, 1, 1, 12, 0, 0),
+                                                                             datetime(2020, 1, 1, 14, 0, 0)))
+
         # Set datetime constraint after upper_bound
         self.clear_time_constraints()
-        self.add_time_at_constraint(datetime(2020, 1, 2, 15, 0, 0))
+        self.add_time_at_constraint(datetime(2020, 1, 1, 15, 0, 0))
         self.assertFalse(tc1.can_run_within_timewindow_with_time_constraints(self.scheduling_unit_blueprint,
                                                                             datetime(2020, 1, 1, 12, 0, 0),
                                                                             datetime(2020, 1, 1, 14, 0, 0)))
 
+        # Set datetime constraint at lower_bound
+        self.clear_time_constraints()
+        self.add_time_at_constraint(datetime(2020, 1, 1, 12, 0, 0))
+        self.assertTrue(self.execute_can_run_within_timewindow_with_time_constraints_of_24hour_boundary())
+
+        # Set datetime constraint that fits the time window
+        self.clear_time_constraints()
+        self.add_time_at_constraint(datetime(2020, 1, 1, 18, 30, 0))
+        self.assertTrue(self.execute_can_run_within_timewindow_with_time_constraints_of_24hour_boundary())
+
+        # Set datetime constraint so that obs lasts till exactly upper_bound
+        self.clear_time_constraints()
+        self.add_time_at_constraint(datetime(2020, 1, 2, 9, 50, 0))
+        self.assertTrue(self.execute_can_run_within_timewindow_with_time_constraints_of_24hour_boundary())
+
     def test_can_run_within_between_constraints(self):
         """
         Test multiple 'between' constraints within 24 boundary and check overall result of