Not initialiazed variables now returns BuiltinConcepts.NOT_INITIALIZED

tests/parsers/test_BnfNodeParser.py

@@ -447,11 +447,11 @@ class TestBnfNodeParser(TestUsingMemoryBasedSheerka):
 
         # explicit validations of the compiled
         concept_foo = sequences[0][0].concept
-        assert concept_foo.body is None
+        assert concept_foo.body == BuiltinConcepts.NOT_INITIALIZED
         assert concept_foo.compiled == {ConceptParts.BODY: DoNotResolve("one two")}
 
         concept_bar = sequences[1][0].concept
-        assert concept_bar.body is None
+        assert concept_bar.body == BuiltinConcepts.NOT_INITIALIZED
         assert concept_bar.compiled == {
             ConceptParts.BODY: concept_foo,
             "foo": concept_foo
@@ -473,11 +473,11 @@ class TestBnfNodeParser(TestUsingMemoryBasedSheerka):
 
         # explicit validations of the compiled
         concept_foo = sequences[0][0].concept
-        assert concept_foo.body is None
+        assert concept_foo.body == BuiltinConcepts.NOT_INITIALIZED
         assert len(concept_foo.compiled) == 0  # because there is a body defined in the metadata
 
         concept_bar = sequences[1][0].concept
-        assert concept_bar.body is None
+        assert concept_bar.body == BuiltinConcepts.NOT_INITIALIZED
         assert concept_bar.compiled == {
             ConceptParts.BODY: concept_foo,
             "foo": concept_foo
@@ -500,18 +500,18 @@ class TestBnfNodeParser(TestUsingMemoryBasedSheerka):
 
         # explicit validations of the compiled
         concept_foo = sequences[0][0].concept
-        assert concept_foo.body is None
+        assert concept_foo.body == BuiltinConcepts.NOT_INITIALIZED
         assert concept_foo.compiled == {ConceptParts.BODY: DoNotResolve("one two")}
 
         concept_bar = sequences[1][0].concept
-        assert concept_bar.body is None
+        assert concept_bar.body == BuiltinConcepts.NOT_INITIALIZED
         assert concept_bar.compiled == {
             ConceptParts.BODY: concept_foo,
             "foo": concept_foo
         }
 
         concept_baz = sequences[2][0].concept
-        assert concept_baz.body is None
+        assert concept_baz.body == BuiltinConcepts.NOT_INITIALIZED
         assert concept_baz.compiled == {
             ConceptParts.BODY: concept_bar,
             "bar": concept_bar,
@@ -631,7 +631,7 @@ class TestBnfNodeParser(TestUsingMemoryBasedSheerka):
 
         # explicit validations of the compiled
         concept_foo = sequences[0].concept
-        assert concept_foo.body is None
+        assert concept_foo.body == BuiltinConcepts.NOT_INITIALIZED
         assert concept_foo.compiled == {'number': my_map["number"],
                                         'two': my_map["two"],
                                         ConceptParts.BODY: DoNotResolve(value='twenty two')}
@@ -642,7 +642,7 @@ class TestBnfNodeParser(TestUsingMemoryBasedSheerka):
 
         # explicit validations of the compiled
         concept_foo = sequences[0].concept
-        assert concept_foo.body is None
+        assert concept_foo.body == BuiltinConcepts.NOT_INITIALIZED
         assert concept_foo.compiled == {'number': my_map["number"],
                                         'one': my_map["one"],
                                         ConceptParts.BODY: DoNotResolve(value='twenty one')}