With Grails 3.1.9 and above we now get a default port for Functional tests that is randomly assigned. This is a great feature that was added in with this commit.

While this is a nice addition our tests which were not using Geb were left broken this is due to the fact we now need to know what port was selected for a given run of the tests. So our old test:

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@Integration
class UserEndpointSpec extends Specification {
  def "POST new user"() {
    given:
    ResponseEntity<Map> resp
    RestTemplate restTemplate = new RestTemplate()
    def requestBody = [
        email: 'phil@aol.com',
        fullName: 'Phil',
        password: 'password',
        username: 'phil'
    ]

    when:
    resp = restTemplate.postForEntity("http://localhost:8080/users", requestBody, Map)

    then:
    resp.statusCode == HttpStatus.NO_CONTENT
  }
}

Was broken since the app no longer started on 8080, but we can fix that with a new property that the @Integration annotation adds which is serverPort so the test becomes:

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@Integration
class UserEndpointSpec extends Specification {
  def "POST new user"() {
    given:
    ResponseEntity<Map> resp
    RestTemplate restTemplate = new RestTemplate()
    def requestBody = [
        email: 'phil@aol.com',
        fullName: 'Phil',
        password: 'password',
        username: 'phil'
    ]

    when:
    resp = restTemplate.postForEntity("http://localhost:${serverPort}/users", requestBody, Map)

    then:
    resp.statusCode == HttpStatus.NO_CONTENT
  }
}

If you are wondering how serverPort is actually set you can see it happening inside IntegrationTestMixinTransformation. It will add a property to the test class with the port.

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