Enhanced ExecutionContext to keep track of the execution flow

tests/test_concept.py

@@ -32,8 +32,37 @@ def test_i_can_serialize():
     Test concept.to_dict()
     :return:
     """
-    # TODO
-    pass
+    concept = Concept(
+        name="concept_name",
+        is_builtin=True,
+        is_unique=True,
+        key="concept_key",
+        body="definition of the body",
+        where="definition of the where",
+        pre="definition of the pre",
+        post="definition of the post",
+        definition="bnf definition",
+        definition_type="def type",
+        desc="this this the desc",
+        id="123456"
+    ).set_prop("a", 10).set_prop("b", None)
+
+    to_dict = concept.to_dict()
+    assert to_dict == {
+        'body': 'definition of the body',
+        'definition': 'bnf definition',
+        'definition_type': 'def type',
+        'desc': 'this this the desc',
+        'id': '123456',
+        'is_builtin': True,
+        'is_unique': True,
+        'key': 'concept_key',
+        'name': 'concept_name',
+        'post': 'definition of the post',
+        'pre': 'definition of the pre',
+        'props': [('a', 10), ('b', None)],
+        'where': 'definition of the where'
+    }
 
 
 def test_i_can_deserialize():
@@ -41,5 +70,61 @@ def test_i_can_deserialize():
     Test concept.from_dict()
     :return:
     """
-    # TODO
-    pass
+
+    from_dict = {
+        'body': 'definition of the body',
+        'definition': 'bnf definition',
+        'definition_type': 'def type',
+        'desc': 'this this the desc',
+        'id': '123456',
+        'is_builtin': True,
+        'is_unique': True,
+        'key': 'concept_key',
+        'name': 'concept_name',
+        'post': 'definition of the post',
+        'pre': 'definition of the pre',
+        'props': [('a', 10), ('b', None)],
+        'where': 'definition of the where'
+    }
+
+    concept = Concept().from_dict(from_dict)
+
+    assert concept == Concept(
+        name="concept_name",
+        is_builtin=True,
+        is_unique=True,
+        key="concept_key",
+        body="definition of the body",
+        where="definition of the where",
+        pre="definition of the pre",
+        post="definition of the post",
+        definition="bnf definition",
+        definition_type="def type",
+        desc="this this the desc",
+        id="123456"
+    ).set_prop("a", 10).set_prop("b", None)
+
+
+def test_i_can_compare_concept_with_circular_reference():
+    foo = Concept("foo")
+    foo.metadata.body = foo
+
+    assert foo == foo
+
+
+def test_i_can_compare_concept_with_sophisticated_circular_reference():
+    foo = Concept("foo")
+    bar = Concept("foo", body=foo)
+    baz = Concept("foo", body=bar)
+    foo.metadata.body = baz
+
+    assert foo != bar
+
+
+def test_i_can_compare_concept_with_sophisticated_circular_reference_in_other_metadata():
+    foo = Concept("foo")
+    bar = Concept("foo", pre=foo)
+    baz = Concept("foo", pre=bar)
+    foo.metadata.pre = baz
+
+    assert foo != bar