public void GetAssociationSet_should_return_association_set()
        {
            var model = new EdmModel().Initialize();
            var entityType = model.AddEntityType("Foo");
            model.AddEntitySet("FooSet", entityType);
            var associationType = new EdmAssociationType().Initialize();
            associationType.SourceEnd.EntityType = entityType;
            associationType.TargetEnd.EntityType = entityType;
            model.AddAssociationSet("FooSet", associationType);

            var associationSet = model.GetAssociationSet(associationType);

            Assert.NotNull(associationSet);
            Assert.Same(associationType, associationSet.ElementType);
        }