Implemented SheerkaOntology

tests/core/test_SheerkaEventManager.py

@@ -1,3 +1,5 @@
+import pytest
+
 from core.sheerka.services.SheerkaEventManager import SheerkaEventManager
 
 from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
@@ -44,7 +46,7 @@ example_of_class_method. event=xxx
 """
 
         service = sheerka.services[SheerkaEventManager.NAME]
-        service.reset_topic(topic)
+        service.test_only_reset_topic(topic)
 
     def test_i_can_subscribe_and_publish_with_data(self, capsys):
         sheerka, context = self.init_concepts()
@@ -63,4 +65,21 @@ example_of_class_method. event=xxx, data='42'
 """
 
         service = sheerka.services[SheerkaEventManager.NAME]
-        service.reset_topic(topic)
+        service.test_only_reset_topic(topic)
+
+    def test_i_can_save_and_reset_state(self):
+        sheerka, context = self.init_concepts()
+        service = sheerka.services[SheerkaEventManager.NAME]
+
+        sheerka.subscribe("my first topic", self.example_of_class_method_with_data)
+
+        sheerka.push_ontology(context, "new ontology")
+        sheerka.subscribe("my second topic", self.example_of_class_method_with_data)
+
+        # I can access to the topic
+        assert "my first topic" in service.subscribers
+        assert "my second topic" in service.subscribers
+
+        sheerka.pop_ontology()
+        assert "my first topic" in service.subscribers
+        assert "my second topic" not in service.subscribers