Fixed #32 : concept groups are not correctly updated

Fixed #35 : Refactor test helper class (CNC, CC, CIO)
Fixed #36 : Concept values are not used when declared with variable expression
Fixed #37 : Objects in memory lose their values are restart
Fixed #38 : func(a=b, c) (which is not allowed) raise an exception

tests/core/test_concept.py

@@ -1,7 +1,9 @@
 import pytest
-from core.builtin_concepts import BuiltinConcepts
 
-from core.concept import Concept, ConceptParts, DEFINITION_TYPE_DEF, ALL_ATTRIBUTES, get_concept_attrs
+from core.builtin_concepts import BuiltinConcepts
+from core.concept import Concept, ConceptParts, DEFINITION_TYPE_DEF, ALL_ATTRIBUTES, get_concept_attrs, \
+    freeze_concept_attrs
+from core.global_symbols import NotInit
 
 
 @pytest.mark.parametrize("name, variables, expected", [
@@ -121,6 +123,7 @@ def test_i_can_deserialize():
     }
 
     concept = Concept().from_dict(from_dict)
+    freeze_concept_attrs(concept)
 
     assert concept == Concept(
         name="concept_name",
@@ -281,16 +284,21 @@ def test_i_can_manage_concepts_attributes():
     assert concept.values() == {"#body#": "I have a body!"}
 
 
-def test_attributes_are_generated_once_for_all():
+def test_i_can_manage_instance_attributes():
     ALL_ATTRIBUTES.clear()
-    concept = Concept("foo")
-    concept.get_metadata().id = "id"
 
-    concept.set_value("key1", "value1")
-    concept.set_value("key2", "value2")
-    assert get_concept_attrs(concept) == ["key1", "key2"]
-    assert concept.values() == {"key1": "value1", "key2": "value2"}
+    foo = Concept("foo", id="foo_id").def_var("x")
 
-    concept.set_value("key3", "value3")  # too late for it !
-    assert get_concept_attrs(concept) == ["key1", "key2"]
-    assert concept.values() == {"key1": "value1", "key2": "value2"}
+    assert foo.values() == {"x": NotInit}
+    assert foo.get_all_attributes() is None
+    assert ALL_ATTRIBUTES == {"foo_id": ["x"]}
+
+    foo.set_value("x", "value for x")
+    assert foo.values() == {"x": "value for x"}
+    assert foo.get_all_attributes() is None
+    assert ALL_ATTRIBUTES == {"foo_id": ["x"]}
+
+    foo.set_value("y", "value for y")
+    assert foo.values() == {"x": "value for x", "y": "value for y"}
+    assert foo.get_all_attributes() == ["x", "y"]
+    assert ALL_ATTRIBUTES == {"foo_id": ["x"]}