Updated tests on bug, when get list returns deleted items

In I4d2f44fa149aee564c62a69822c6ad79de5bba8a we introduced new
_get_model_list method that introduces unify way for retrieving models
from db. This commit adds tests that do checks on bug 1761956, when
selecting with filter() method could return deleted entites.

Change-Id: I12df4af70bcc25654a0fb276ea7145d772d891e2
Related-Bug: 1761956

watcher/tests/db/test_scoring_engine.py

@@ -257,6 +257,15 @@ class DbScoringEngineTestCase(base.DbTestCase):
             description='ScoringEngine 2',
             metainfo="a2=b2",
         )
+        scoring_engine3 = utils.create_test_scoring_engine(
+            id=3,
+            uuid=w_utils.generate_uuid(),
+            name="SE_ID_3",
+            description='ScoringEngine 3',
+            metainfo="a3=b3",
+        )
+
+        self.dbapi.soft_delete_scoring_engine(scoring_engine3['uuid'])
 
         res = self.dbapi.get_scoring_engine_list(
             self.context, filters={'description': 'ScoringEngine 1'})
@@ -267,8 +276,7 @@ class DbScoringEngineTestCase(base.DbTestCase):
         self.assertEqual([], [r.name for r in res])
 
         res = self.dbapi.get_scoring_engine_list(
-            self.context,
-            filters={'description': 'ScoringEngine 2'})
+            self.context, filters={'description': 'ScoringEngine 2'})
         self.assertEqual([scoring_engine2['name']], [r.name for r in res])
 
     def test_get_scoring_engine_by_id(self):