Refactored services to inherit from BaseService

tests/evaluators/test_EvalEvaluator.py

@@ -2,6 +2,7 @@ import pytest
 
 from core.builtin_concepts import ReturnValueConcept, BuiltinConcepts
 from core.concept import Concept
+from core.sheerka.services.SheerkaSetsManager import SheerkaSetsManager
 from evaluators.EvalEvaluator import EvalEvaluator
 from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
 
@@ -69,7 +70,8 @@ class TestEvalEvaluator(TestUsingMemoryBasedSheerka):
             Concept("bar"),
             Concept("baz"),
             Concept("number"))
-        sheerka.sets_handler.add_concepts_to_set(context, [foo, bar, baz], number)
+        sets_handler = sheerka.services[SheerkaSetsManager.NAME]
+        sets_handler.add_concepts_to_set(context, [foo, bar, baz], number)
 
         evaluated = EvalEvaluator().eval(context, [retval(number)])