How to write tests using specification-arg-resolver?

I am using specification arg resolver to write my controller

@Or({
    @Spec(path="firstName", params="name", spec=Like.class),
    @Spec(path="lastName", params="name", spec=Like.class)
})
public interface FullNameSpec extends Specification<Customer> {
}

How can we write tests for this in service layer.

I want to know how I can use any of the names(first or last) in my service class tests so that I can call the repository with different specification.