feat(core): Add supprt to model create test for manytomany field

ref: #783

app/core/tests/unit/centurion_abstract/test_unit_centurion_abstract_model.py

@@ -245,10 +245,44 @@ class CenturionAbstractModelInheritedCases(
 
         model.context['user'] = user
 
+        kwargs = {}
+
+        many_field = {}
+
+        for field, value in self.kwargs_create_item.items():
+
+            if isinstance(getattr(model, field).field, models.ManyToManyField):
+
+                if field in many_field:
+
+                    many_field[field] += [ value ]
+
+                else:
+
+                    many_field.update({
+                        field: [
+                            value
+                        ]
+                    })
+
+                continue
+
+            kwargs.update({
+                field: value
+            })
+
+
         model_object = model.objects.create(
-            **self.kwargs_create_item
+            **kwargs
         )
 
+        for field, values in many_field.items():
+
+            for value in values:
+
+                getattr(model_object, field).add( value )
+
+
         model.context['user'] = default_val
 
         assert type(model_object.id) is int