chore(fvt): tidyup broker await

- ensure test clients are closed after use
- increase initial delay, will be at least 10s to become ready so no
  point polling too early
- bump default KAFKA_VERSION to 3.5.1 if not set

Signed-off-by: Dominic Evans <dominic.evans@uk.ibm.com>

functional_test.go

@@ -154,7 +154,7 @@ func prepareDockerTestEnvironment(ctx context.Context, env *testEnvironment) err
 	if version, ok := os.LookupEnv("KAFKA_VERSION"); ok {
 		env.KafkaVersion = version
 	} else {
-		env.KafkaVersion = "3.3.2"
+		env.KafkaVersion = "3.5.1"
 	}
 
 	c := exec.Command("docker-compose", "up", "-d")
@@ -179,9 +179,6 @@ func prepareDockerTestEnvironment(ctx context.Context, env *testEnvironment) err
 	}
 
 	config := NewFunctionalTestConfig()
-	if err != nil {
-		return err
-	}
 	config.Net.DialTimeout = 1 * time.Second
 	config.Net.ReadTimeout = 1 * time.Second
 	config.Net.WriteTimeout = 1 * time.Second
@@ -190,9 +187,14 @@ func prepareDockerTestEnvironment(ctx context.Context, env *testEnvironment) err
 	// wait for the kafka brokers to come up
 	allBrokersUp := false
 
+	Logger.Printf("waiting for kafka %s brokers to come up...\n", env.KafkaVersion)
+	time.Sleep(10 * time.Second)
+
 mainLoop:
 	for i := 0; i < 30 && !allBrokersUp; i++ {
-		Logger.Println("waiting for kafka brokers to come up")
+		if i > 0 {
+			Logger.Printf("still waiting for kafka %s brokers to come up...\n", env.KafkaVersion)
+		}
 		time.Sleep(3 * time.Second)
 		brokersOk := make([]bool, len(env.KafkaBrokerAddrs))
 
@@ -213,22 +215,28 @@ mainLoop:
 			}
 			err = client.RefreshMetadata()
 			if err != nil {
+				client.Close()
 				continue
 			}
 			brokers := client.Brokers()
 			if len(brokers) < expectedBrokers {
+				client.Close()
 				continue
 			}
 			for _, broker := range brokers {
 				err := broker.Open(client.Config())
 				if err != nil {
+					client.Close()
 					continue retryLoop
 				}
 				connected, err := broker.Connected()
 				if err != nil || !connected {
+					broker.Close()
+					client.Close()
 					continue retryLoop
 				}
 			}
+			client.Close()
 			brokersOk[j] = true
 		}