How to mock Java 8 Function in Spock Groovy

Question

I want to mock Java 8 Function in spock groovy

below is my transformer interface

interface Transformer {
  String doSomething();
  Integer performTest();
  Function<List<Test>, String> findSuccess();
}

want to mock this Function in service

transformer.findSuccess().apply(tests);  // service class code

Please help me on this

Answer 1

I am using groovy 2.5 and I have added below in my test case. it's working

def function = {
  "1234"
} as Function<List<Test>, String>
1 * transformer.findSuccess() >> function