### Question:
HeartbeatCustomDSInfo extends HeartbeatInfo { public String getServiceClass() { return serviceClass; }  String getServiceClass(); void setServiceClass(String serviceClass); void contributeToHttpCall(HeartbeatCall call); String getKey();  }### Answer:
@Test void getAndSet_instanceWithDefaultValues() { final HeartbeatCustomDSInfo instance = new HeartbeatCustomDSInfo(); assertNull(instance.getServiceClass()); }