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/parsers/test_BnfParser.py

@@ -4,13 +4,13 @@ from core.builtin_concepts import BuiltinConcepts
 from core.concept import Concept, DEFINITION_TYPE_BNF
 from core.sheerka.services.SheerkaExecute import ParserInput
 from core.tokenizer import Tokenizer, TokenKind, LexerError
-from parsers.BaseNodeParser import cnode
 from parsers.BaseParser import UnexpectedTokenParsingError, UnexpectedEofParsingError
 from parsers.BnfDefinitionParser import BnfDefinitionParser
 from parsers.BnfNodeParser import BnfNodeParser, RegExMatch, VariableExpression
 from parsers.BnfNodeParser import StrMatch, Optional, ZeroOrMore, OrderedChoice, Sequence, \
     OneOrMore, ConceptExpression
 from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
+from tests.parsers.parsers_utils import CN, compare_with_test_object
 
 
 class ClassWithName:
@@ -226,15 +226,15 @@ class TestBnfParser(TestUsingMemoryBasedSheerka):
 
         res = bnf_parser.parse(context, ParserInput("twenty two"))
         assert res.status
-        assert res.value.body == [cnode("bar", 0, 2, "twenty two")]
+        compare_with_test_object(res.value.body, [CN("bar", "twenty two", 0, 2)])
 
         res = bnf_parser.parse(context, ParserInput("thirty one"))
         assert res.status
-        assert res.value.body == [cnode("bar", 0, 2, "thirty one")]
+        compare_with_test_object(res.value.body, [CN("bar", "thirty one", 0, 2)])
 
         res = bnf_parser.parse(context, ParserInput("twenty"))
         assert res.status
-        assert res.value.body == [cnode("foo", 0, 0, "twenty")]
+        compare_with_test_object(res.value.body, [CN("foo", "twenty", 0, 0)])
 
     def test_i_cannot_parse_when_too_many_concepts(self):
         sheerka, context, regex_parser, foo1, foo2 = self.init_parser(