when:
        def result = dependencyConstraintHandler.someConf("someNotation", "someOther")

        then:
        result == null

        and:
        1 * dependencyConstraintFactory.createDependencyConstraint("someNotation") >> constraint1
        1 * dependencyConstraintFactory.createDependencyConstraint("someOther") >> constraint2
        1 * dependencyConstraintSet.add(constraint1)

        this.instantiator = instantiator;
    }

    @Override
    public void describe(DiagnosticsVisitor visitor) {
        visitor.candidate("FileCollections").example("files('some.jar', 'someOther.jar')");
    }

    @Override
    public void convert(FileCollection notation, NotationConvertResult<? super FileCollectionDependency> result) throws TypeConversionException {