Fixed initialisation issue for concepts with BNF definition

tests/test_sheerka.py

@@ -319,6 +319,7 @@ def test_list_of_concept_is_sorted_by_id():
 
     assert concepts[0].id < concepts[-1].id
 
+
 # !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 #
 #               E V A L U A T I O N S
@@ -597,9 +598,7 @@ def test_i_can_create_concept_with_bnf_definition():
     sheerka = get_sheerka(False, False)
     a = Concept("a")
     sheerka.add_in_cache(a)
-    sheerka.concepts_grammars = ConceptLexerParser().initialize(
-        get_context(sheerka),
-        {a: OrderedChoice("one", "two")}).body
+    sheerka.concepts_definition_cache = {a: OrderedChoice("one", "two")}
 
     res = sheerka.evaluate_user_input("def concept plus from bnf a ('plus' plus)?")
     assert len(res) == 1
@@ -637,7 +636,6 @@ def test_i_can_eval_bnf_definitions():
     assert sheerka.isinstance(res[0].value, concept_a)
 
 
-
 def test_i_can_eval_bnf_definitions_with_variables():
     sheerka = get_sheerka()
     concept_a = sheerka.evaluate_user_input("def concept a from bnf 'one' | 'two'")[0].body.body
@@ -659,18 +657,26 @@ def test_i_can_eval_bnf_definitions_from_separate_instances():
     but make sure that the BNF are correctly persisted and loaded
     """
     sheerka = get_sheerka(False)
-    concept_a = sheerka.evaluate_user_input("def concept a from bnf 'one' | 'two'")[0].body.body
+    concept_a = sheerka.evaluate_user_input("def concept a from bnf 'one' 'two'")[0].body.body
 
-    res = get_sheerka(False).evaluate_user_input("one")
+    res = get_sheerka(False).evaluate_user_input("one two")
     assert len(res) == 1
     assert res[0].status
     assert sheerka.isinstance(res[0].value, concept_a)
 
-    res = get_sheerka(False).evaluate_user_input("two")
+    # add another bnf definition
+    concept_b = sheerka.evaluate_user_input("def concept b from bnf a 'three'")[0].body.body
+
+    res = get_sheerka(False).evaluate_user_input("one two")  # previous one still works
     assert len(res) == 1
     assert res[0].status
     assert sheerka.isinstance(res[0].value, concept_a)
 
+    res = get_sheerka(False).evaluate_user_input("one two three")  # new one works
+    assert len(res) == 1
+    assert res[0].status
+    assert sheerka.isinstance(res[0].value, concept_b)
+
 
 def get_sheerka(use_dict=True, skip_builtins_in_db=True):
     root = "mem://" if use_dict else root_folder