human: Given a node-centered hypergraph: <hypergraph>, where nodes represent authors and hyperedges represent groups of authors who co-authored the same paper.

Details of the hypergraph:
Center node: "A reduced test suite for protocol conformance testing"
  Abstract: {}

Connected through hyperedge HE-1 (induced by source paper "Toward automatic generation of novice user test scripts"):
  with members:
    - "GUI testing using computer vision"

Connected through hyperedge HE-2 (induced by source paper "A protocol test generation procedure"):
  with members:
    - "Formal methods for protocol testing: a detailed study"
    - "Test development for communication protocols: towards automation"
    - "Validation-based test sequence generation for networks of extended finite state machines"

Connected through hyperedge HE-3 (induced by source paper "Formal methods for protocol testing: a detailed study"):
  with members:
    - "A protocol test generation procedure"
    - "Test development for communication protocols: towards automation"
    - "Validation-based test sequence generation for networks of extended finite state machines"
    - "Bounded sequence testing from deterministic finite state machines"
    - "Online minimization of transition systems (extended abstract)"

Question: Please tell me which research area the center author belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Computer science