Concepts bodies are now evaluated on demand

tests/evaluators/test_ConceptEvaluator.py

@@ -20,6 +20,7 @@ class TestAddConceptEvaluator(TestUsingMemoryBasedSheerka):
 
     def test_i_can_evaluate_concept(self):
         context = self.get_context()
+        context.extra_info.append(BuiltinConcepts.CONCEPT_EVAL_REQUESTED)
         concept = Concept(name="foo",
                           where="True",
                           pre="2",
@@ -27,6 +28,7 @@ class TestAddConceptEvaluator(TestUsingMemoryBasedSheerka):
 
         evaluator = ConceptEvaluator()
         item = self.pretval(concept)
+        evaluator.init_evaluator(context, [item])
         result = evaluator.eval(context, item)
 
         assert result.who == evaluator.name
@@ -42,6 +44,7 @@ class TestAddConceptEvaluator(TestUsingMemoryBasedSheerka):
 
     def test_body_is_returned_when_defined_and_requested(self):
         context = self.get_context()
+        context.extra_info.append(BuiltinConcepts.CONCEPT_EVAL_REQUESTED)
         concept = Concept(name="foo",
                           body="'I have a value'",
                           where="True",
@@ -50,6 +53,7 @@ class TestAddConceptEvaluator(TestUsingMemoryBasedSheerka):
 
         evaluator = ConceptEvaluator(return_body=True)
         item = self.pretval(concept)
+        evaluator.init_evaluator(context, [item])
         result = evaluator.eval(context, item)
 
         assert result.who == evaluator.name
@@ -67,6 +71,7 @@ class TestAddConceptEvaluator(TestUsingMemoryBasedSheerka):
 
         evaluator = ConceptEvaluator(return_body=False)  # which is the default behaviour
         item = self.pretval(concept)
+        evaluator.init_evaluator(context, [item])
         result = evaluator.eval(context, item)
 
         assert result.who == evaluator.name
@@ -90,6 +95,7 @@ class TestAddConceptEvaluator(TestUsingMemoryBasedSheerka):
 
     def test_i_cannot_recognize_a_concept_if_one_of_the_prop_is_unknown(self):
         context = self.get_context()
+        context.extra_info.append(BuiltinConcepts.CONCEPT_EVAL_REQUESTED)
         context.sheerka.add_in_cache(Concept(name="one").init_key())
         concept_plus = context.sheerka.add_in_cache(Concept(name="a plus b")
                                                     .def_prop("a", "one")
@@ -97,6 +103,7 @@ class TestAddConceptEvaluator(TestUsingMemoryBasedSheerka):
 
         evaluator = ConceptEvaluator()
         item = self.pretval(concept_plus)
+        evaluator.init_evaluator(context, [item])
         result = evaluator.eval(context, item)
 
         assert not result.status