Use PollingConditions with return value in Spock?

Question

I would like to use PollingConditions.eventually to evaluate and return value:

    @Shared
    static PollingConditions POLLING_CONDITIONS = new PollingConditions(
            timeout: 30, delay: 1.5, factor: 1.25
    )

    MyResponseContainerDto sendRequestWithRetries(String body, String uri) {
        ExtractableResponse<Response> extractedResponse = null
        POLLING_CONDITIONS.eventually {
           extractedResponse = sendRequest(body, uri).extract()
            assert extractedResponse.statusCode() == 200
        }

        return extractedResponse.as(MyResponseContainerDto.class)
    }

    ValidatableResponse sendRequest(String body, String uri) {
            return RestAssured.given()
                    .contentType(JSON)
                    .body(body)
                    .when()
                    .post("/myApi" + "/" + uri)
                    .then()
                    .log().all()
    }

When I try to run the above code I get:

Expected a condition, but found an assignment. Did you intend to write '==' ? @ line 42, column 12.
              extractedResponse = sendRequest(body, uri).extract()
              ^

Is there a possibility to have an assignment inside the eventually block?

Answer 1

As an alternative to Marcin's suggestion, a simple workaround would be an explicit interaction block:

package de.scrum_master.stackoverflow.q75663270

import spock.lang.Shared
import spock.lang.Specification
import spock.util.concurrent.PollingConditions

class PollingConditionsTest extends Specification {
  @Shared
  PollingConditions POLLING_CONDITIONS = new PollingConditions(
    timeout : 3, delay : 0.2, factor : 1
  )

  def myHelper() {
    def extractedResponse = null
    POLLING_CONDITIONS.eventually {
      interaction {
        extractedResponse = "xxx"
        assert extractedResponse.contains("x")
      }
    }
    extractedResponse
  }

  def test() {
    expect:
    myHelper() == "xxx"
  }
}

Please note however that, because the interaction block in your case is not inside then/expect but rather in a helper method, you still need the explicit assert.

Try it in the Groovy Web Console.

P.S.: A @Shared field should not be static. It is Spock's better (with regard to Spock spec lifecycle) alternative to static fields.