whole_func_string: function promiseShouldSucceed(promise, done, handler) {
      promise.then(result => {
          handler(result)
          done()
      }).
      catch(error => done(error))
  }
func_code_string: function promiseShouldSucceed(promise, done, handler) {
      promise.then(result => {
          handler(result)
          done()
      }).
      catch(error => done(error))
  }
func_documentation_string: Test a promise for success