First version of explain. Creating a new parser was a wrong approach. Need to reimplement

tests/core/test_SheerkaVariableManager.py

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+from core.concept import Concept, ConceptParts
+from core.sheerka.Services.SheerkaVariableManager import SheerkaVariableManager
+
+from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
+
+
+class TestSheerkaVariable(TestUsingMemoryBasedSheerka):
+    def test_i_can_record_and_load_a_constant(self):
+        sheerka = self.get_sheerka()
+        context = self.get_context(sheerka)
+
+        sheerka.record(context, "TestSheerkaVariable", "my_variable", 1)
+        res = sheerka.load("TestSheerkaVariable", "my_variable")
+        assert res == 1
+
+        assert sheerka.sdp.exists(SheerkaVariableManager.VARIABLES_ENTRY, "TestSheerkaVariable.my_variable")
+        loaded = sheerka.sdp.get(SheerkaVariableManager.VARIABLES_ENTRY, "TestSheerkaVariable.my_variable")
+        assert loaded.event_id == context.event.get_digest()
+        assert loaded.key == "my_variable"
+        assert loaded.value == 1
+        assert loaded.who == "TestSheerkaVariable"
+        assert loaded.parents is None
+
+    def test_i_can_record_and_load_a_concept(self):
+        sheerka = self.get_sheerka()
+        context = self.get_context(sheerka)
+
+        concept = Concept("foo").set_prop("a", "alpha").set_metadata_value(ConceptParts.BODY, 3.14)
+
+        sheerka.record(context, "TestSheerkaVariable", "my_variable", concept)
+        res = sheerka.load("TestSheerkaVariable", "my_variable")
+
+        assert res == concept
+        assert res.body == concept.body
+
+    def test_i_can_get_the_parent_when_modified(self):
+        sheerka = self.get_sheerka()
+        context = self.get_context(sheerka)
+
+        sheerka.record(context, "TestSheerkaVariable", "my_variable", 1)
+        sheerka.record(context, "TestSheerkaVariable", "my_variable", 2)
+        res = sheerka.load("TestSheerkaVariable", "my_variable")
+        assert res == 2
+
+        loaded = sheerka.sdp.get(SheerkaVariableManager.VARIABLES_ENTRY, "TestSheerkaVariable.my_variable")
+        assert loaded.event_id == context.event.get_digest()
+        assert loaded.key == "my_variable"
+        assert loaded.value == 2
+        assert loaded.who == "TestSheerkaVariable"
+        assert loaded.parents == ['8c9ada7bf488d84229f6539f76042431638f16d600fe3b7ec7e7161043a40d59']
+
+        parent = sheerka.sdp.load_obj(loaded.parents[0])
+        assert parent.event_id == context.event.get_digest()
+        assert parent.key == "my_variable"
+        assert parent.value == 1
+        assert parent.who == "TestSheerkaVariable"
+        assert parent.parents is None
+
+    def test_variable_is_not_persisted_if_the_value_is_the_same(self):
+        sheerka = self.get_sheerka()
+        context = self.get_context(sheerka)
+
+        sheerka.record(context, "TestSheerkaVariable", "my_variable", 1)
+        sheerka.record(context, "TestSheerkaVariable", "my_variable", 1)
+
+        loaded = sheerka.sdp.get(SheerkaVariableManager.VARIABLES_ENTRY, "TestSheerkaVariable.my_variable")
+        assert loaded.event_id == context.event.get_digest()
+        assert loaded.key == "my_variable"
+        assert loaded.value == 1
+        assert loaded.who == "TestSheerkaVariable"
+        assert loaded.parents is None