def METHOD_NAME(db, info):
    FakeModel = get_fake_model(model_base=models.UUIDModel)
    class Serializer(serializers.ModelSerializer):
        class Meta:
            model = FakeModel
            fields = "__all__"
    class CustomMutation1(Mutation):
        class Meta:
            serializer_class = Serializer
    class CustomMutation2(Mutation):
        class Meta:
            serializer_class = Serializer
    class CustomValidation(BaseValidation):
        @validation_for(CustomMutation1)
        @validation_for(CustomMutation2)
        def validate_custom_mutation(self, mutation, data, info):
            data["test"] = "test"
            return data
    data = CustomValidation().validate(CustomMutation1, {}, info)
    assert data["test"] == "test"
    data = CustomValidation().validate(CustomMutation2, {}, info)
    assert data["test"] == "test"