text: const hello = require('./../services/helloWorld');
  
  test('should return Hello world ', () => {
      expect(callHello({data: 'data'})).toEqual({
          statusCode: 200,
          body: JSON.stringify({
              message: "Hello world",
              input: {
                  data: "data"
              }
          })
      });
  
  });
  
  function callHello(data) {
      let result = undefined;
      hello({data: 'data'}, {}, sendResponse);
  
      function sendResponse(a, response) {
          result = response
      }
  
      return result;
  }