refactor: Moved common test-code into helper-class `KafkaTestUtils`

diff --git a/src/test/java/de/juplo/kafka/chat/backend/implementation/kafka/KafkaTestUtils.java b/src/test/java/de/juplo/kafka/chat/backend/implementation/kafka/KafkaTestUtils.java
new file mode 100644 (file)
index 0000000..79cd8f1
--- /dev/null
+++ b/src/test/java/de/juplo/kafka/chat/backend/implementation/kafka/KafkaTestUtils.java
@@ -0,0 +1,117 @@
+package de.juplo.kafka.chat.backend.implementation.kafka;
+
+import de.juplo.kafka.chat.backend.ChatBackendProperties;
+import de.juplo.kafka.chat.backend.domain.ChatHomeServiceWithShardsTest;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.common.TopicPartition;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration;
+import org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Import;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.kafka.support.SendResult;
+import org.springframework.kafka.test.context.EmbeddedKafka;
+
+import java.time.Clock;
+import java.util.List;
+
+import static de.juplo.kafka.chat.backend.domain.ChatHomeServiceWithShardsTest.NUM_SHARDS;
+import static de.juplo.kafka.chat.backend.implementation.kafka.KafkaChatHomeServiceTest.DATA_TOPIC;
+import static de.juplo.kafka.chat.backend.implementation.kafka.KafkaChatHomeServiceTest.INFO_TOPIC;
+
+
+@SpringBootTest(
+    classes = {
+        KafkaChatHomeServiceTest.KafkaChatHomeTestConfiguration.class,
+        KafkaAutoConfiguration.class,
+        TaskExecutionAutoConfiguration.class,
+    },
+    properties = {
+    "spring.main.allow-bean-definition-overriding=true",
+    "chat.backend.services=kafka",
+    "chat.backend.kafka.client-id-PREFIX=TEST",
+    "chat.backend.kafka.bootstrap-servers=${spring.embedded.kafka.brokers}",
+    "spring.kafka.bootstrap-servers=${spring.embedded.kafka.brokers}",
+    "chat.backend.kafka.info-channel-topic=" + INFO_TOPIC,
+    "chat.backend.kafka.data-channel-topic=" + DATA_TOPIC,
+    "chat.backend.kafka.num-partitions=" + NUM_SHARDS,
+})
+@EmbeddedKafka(
+    topics = { INFO_TOPIC, DATA_TOPIC },
+    partitions = 10)
+@Slf4j
+public class KafkaChatHomeServiceTest extends ChatHomeServiceWithShardsTest
+{
+  final static String INFO_TOPIC = "KAFKA_CHAT_HOME_TEST_INFO";
+  final static String DATA_TOPIC = "KAFKA_CHAT_HOME_TEST_DATA";
+
+
+  @TestConfiguration
+  @EnableConfigurationProperties(ChatBackendProperties.class)
+  @Import(KafkaServicesConfiguration.class)
+  static class KafkaChatHomeTestConfiguration
+  {
+    @Bean
+    WorkAssignor dataChannelWorkAssignor(DataChannel dataChannel)
+    {
+      return consumer ->
+      {
+        List<TopicPartition> assignedPartitions =
+            List.of(new TopicPartition(DATA_TOPIC, 2));
+        consumer.assign(assignedPartitions);
+        dataChannel.onPartitionsAssigned(assignedPartitions);
+      };
+    }
+
+    @Bean
+    Clock clock()
+    {
+      return Clock.systemDefaultZone();
+    }
+  }
+
+
+  @BeforeAll
+  public static void sendAndLoadStoredData(
+      @Autowired ConsumerTaskRunner consumerTaskRunner,
+      @Autowired KafkaTemplate<String, String> messageTemplate) throws InterruptedException
+  {
+    send(messageTemplate, INFO_TOPIC, "5c73531c-6fc4-426c-adcb-afc5c140a0f7","{ \"id\": \"5c73531c-6fc4-426c-adcb-afc5c140a0f7\", \"shard\": 2, \"name\": \"FOO\" }", "event_chatroom_created");
+    send(messageTemplate, DATA_TOPIC, "5c73531c-6fc4-426c-adcb-afc5c140a0f7","{ \"id\" : 1, \"user\" : \"peter\", \"text\" : \"Hallo, ich heiße Peter!\" }", "event_chatmessage_received");
+    send(messageTemplate, DATA_TOPIC, "5c73531c-6fc4-426c-adcb-afc5c140a0f7","{ \"id\" : 1, \"user\" : \"ute\", \"text\" : \"Ich bin Ute...\" }", "event_chatmessage_received");
+    send(messageTemplate, DATA_TOPIC, "5c73531c-6fc4-426c-adcb-afc5c140a0f7","{ \"id\" : 2, \"user\" : \"peter\", \"text\" : \"Willst du mit mir gehen?\" }", "event_chatmessage_received");
+    send(messageTemplate, DATA_TOPIC, "5c73531c-6fc4-426c-adcb-afc5c140a0f7","{ \"id\" : 1, \"user\" : \"klaus\", \"text\" : \"Ja? Nein? Vielleicht??\" }", "event_chatmessage_received");
+
+    consumerTaskRunner.run();
+  }
+
+  static void send(
+      KafkaTemplate<String, String> kafkaTemplate,
+      String topic,
+      String key,
+      String value,
+      String typeId)
+  {
+    ProducerRecord<String, String> record = new ProducerRecord<>(topic, key, value);
+    record.headers().add("__TypeId__", typeId.getBytes());
+    SendResult<String, String> result = kafkaTemplate.send(record).join();
+    log.info(
+        "Sent {}={} to {}",
+        key,
+        value,
+        new TopicPartition(result.getRecordMetadata().topic(), result.getRecordMetadata().partition()));
+  }
+
+  @AfterAll
+  static void joinConsumerTasks(@Autowired ConsumerTaskRunner consumerTaskRunner)
+  {
+    consumerTaskRunner.joinConsumerTasks();
+  }
+}