Fixed EvalEvaluator when there is nothing to evaluate

tests/test_EvalEvaluator.py

@@ -49,11 +49,32 @@ def test_i_can_match_and_eval():
 
 @pytest.mark.parametrize("return_values, expected", [
     ([r(Concept("foo", body="bar")), eval_requested], True),
-    ([r(Concept("status is false", body="bar"), False), eval_requested], False),
-    ([r("string_value"), eval_requested], False),
-    ([r(Concept("no body")), eval_requested], False),
+    ([r(Concept("status is false", body="bar"), False), eval_requested], True),
+    ([r("string_value"), eval_requested], True),
+    ([r(Concept("no body")), eval_requested], True),
     ([r(Concept("eval requested missing", body="bar"))], False),
 ])
 def test_i_cannot_match_if_eval_request_is_not_present(return_values, expected):
     context = get_context()
     assert EvalEvaluator().matches(context, return_values) == expected
+
+
+def test_concept_eval_requested_is_reduced_when_nothing_to_reduce():
+    context = get_context()
+
+    return_values = [
+        ReturnValueConcept("some_name", True, "not to eval"),
+        ReturnValueConcept("some_name", True, Concept(name="not to eval")),
+        ReturnValueConcept("some_name", False, Concept(name="1", body="not to eval")),
+        eval_requested
+    ]
+
+    evaluator = EvalEvaluator()
+    assert evaluator.matches(context, return_values)
+
+    evaluated = evaluator.eval(context, return_values)
+    assert evaluated == ReturnValueConcept(
+        "evaluators.Eval",
+        False,
+        context.sheerka.new(BuiltinConcepts.CONCEPT_EVAL_REQUESTED))
+    assert evaluated.parents == [eval_requested]