Add smoke test for Kafka Streams

Closes gh-12

integration/spring-kafka-streams/README.adoc

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+Tests if Spring Kafka pipeline is CR compatible.
+
+

integration/spring-kafka-streams/build.gradle

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+plugins {
+	id "java"
+	id "org.springframework.boot"
+	id "org.springframework.cr.smoke-test"
+}
+
+dependencies {
+	implementation(platform(org.springframework.boot.gradle.plugin.SpringBootPlugin.BOM_COORDINATES))
+	implementation("org.springframework.boot:spring-boot-starter")
+	implementation("org.springframework.kafka:spring-kafka:3.0.10-SNAPSHOT") // TODO: remove the version once 3.0.10+ is released.
+	implementation("org.apache.kafka:kafka-streams")
+	implementation("com.fasterxml.jackson.core:jackson-databind")
+
+	implementation("org.crac:crac:$cracVersion")
+	implementation(project(":cr-listener"))
+
+	testImplementation("org.springframework.boot:spring-boot-starter-test")
+
+	appTestImplementation(project(":cr-smoke-test-support"))
+	appTestImplementation("org.awaitility:awaitility:4.2.0")
+}

integration/spring-kafka-streams/docker-compose.yml

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+version: '3'
+services:
+  kafka:
+    image: wurstmeister/kafka
+    hostname: kafka
+    ports:
+      - '9092'
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    environment:
+      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
+      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
+      KAFKA_LISTENERS: PLAINTEXT://:29092,PLAINTEXT_HOST://:9092
+      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:29092,PLAINTEXT_HOST://localhost:_{PORT_COMMAND}
+      KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
+      PORT_COMMAND: "docker ps | egrep 'kafka(-|_)1' | cut -d: -f 2 | cut -d- -f 1"
+    depends_on:
+      - zookeeper
+
+  zookeeper:
+    image: wurstmeister/zookeeper
+    ports:
+      - '2181'
+    environment:
+      - KAFKA_ADVERTISED_HOST_NAME=zookeeper

integration/spring-kafka-streams/src/appTest/java/com/example/kafka/KafkaStreamsApplicationCrTests.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.example.kafka;
+
+import java.time.Duration;
+
+import org.awaitility.Awaitility;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.cr.smoketest.support.assertj.AssertableOutput;
+import org.springframework.cr.smoketest.support.junit.ApplicationTest;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@ApplicationTest
+class KafkaStreamsApplicationCrTests {
+
+	@Test
+	void kafkaListenerMethodReceivesMessageAndSendsResponse(AssertableOutput output) {
+		Awaitility.await()
+			.atMost(Duration.ofSeconds(30))
+			.untilAsserted(() -> assertThat(output).hasSingleLineContaining("++++++Received:FOO"));
+	}
+
+}

integration/spring-kafka-streams/src/main/java/com/example/kafka/KafkaStreamsApplication.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.example.kafka;
+
+import org.apache.kafka.clients.admin.NewTopic;
+import org.apache.kafka.streams.KeyValue;
+import org.apache.kafka.streams.StreamsBuilder;
+import org.apache.kafka.streams.kstream.KStream;
+
+import org.springframework.boot.ApplicationRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.kafka.annotation.EnableKafkaStreams;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.kafka.config.TopicBuilder;
+import org.springframework.kafka.core.KafkaTemplate;
+
+@SpringBootApplication
+@EnableKafkaStreams
+public class KafkaStreamsApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(KafkaStreamsApplication.class, args);
+	}
+
+	@Bean
+	KStream<String, String> stream(StreamsBuilder builder) {
+		KStream<String, String> stream = builder.stream("crStreamsIn");
+		stream.map((k, v) -> new KeyValue<>(k, v.toUpperCase())).to("crStreamsOut");
+		return stream;
+	}
+
+	@KafkaListener(id = "cr", topics = "crStreamsOut")
+	public void listen(String in) {
+		System.out.println("++++++Received:" + in);
+	}
+
+	@Bean
+	public NewTopic topic1() {
+		return TopicBuilder.name("crStreamsIn").partitions(1).replicas(1).build();
+	}
+
+	@Bean
+	public NewTopic topic2() {
+		return TopicBuilder.name("crStreamsOut").partitions(1).replicas(1).build();
+	}
+
+	@Bean
+	public ApplicationRunner runner(KafkaTemplate<Object, Object> template) {
+		return args -> {
+			template.send("crStreamsIn", "foo");
+			System.out.println("++++++Sent:foo");
+		};
+	}
+
+}

integration/spring-kafka-streams/src/main/resources/application.properties

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+spring.application.name=crKafkaStreams
+
+spring.kafka.bootstrap-servers=localhost:${KAFKA_PORT_9092:9092}
+spring.kafka.consumer.auto-offset-reset=earliest
+
+spring.kafka.streams.properties.default.key.serde=org.apache.kafka.common.serialization.Serdes$StringSerde
+spring.kafka.streams.properties.default.value.serde=org.apache.kafka.common.serialization.Serdes$StringSerde