async bdd unit runner

MyAsyncTest.groovy

class MyAsyncSpec {
  @Test
  void asyncTestRequest(TestContext context) {
    // startsWith async => creates context.async()
    def client
    setup {
      client = vertx.createHttpClient(...)
    }
    when {
      client.getNow('/api')
    }
    then { response -> // automatically registers the then(Closure closure) as a handler of the object returned by when {}
      context.assertEquals(response.statusCode(), 200)
      // evaluate all the conditions, if nothing is thrown then async.complete()
    }
  }
}