Kafka consumer junit test example github

Kafka consumer junit test example github. @SpringBootTest (. Aug 10, 2022 · Kafka is an open-source event streaming platform, used for publishing and processing events at high-throughput. The project uses a Makefile to simulate a very simple build pipeline with two stages - test and deploy. There are two basic tests: e2e-test. Advantages of using Testcontainers. Kafka's `MockConsumer` test fixture simplifies the process of building unit tests for producer code. May 25, 2018 · Producer: Creates a record and publishes it to the broker. Each example also states its exact requirements and instructions at the very top. Create an instance of the rule in your test class and annotate it with @Rule. send a message to the topic. Pull requests. It is bundled in JUnit and simply put, it uses existing predicates called matcher classes for making assertions. pem file in a text editor of your choice and remove all the Subject information from the file so that you have this left: Open the . json is the Test Case which contains the JSON step(s). MessagePactBuilder; import au. groovy This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. Open . Please note that prefixing the topic name and consumer group id is only necessary if your broker is hosted on CloudKarafka on Developer Duck plan, this is because on the Developer Duck plan your instance is running on a shared broker. CORRECT CODE IS HERE AFTR DISCUSSION. publishResults=true . It also provides a rich set of convenient accessors to interact with such an embedded Kafka cluster in a lean and non-obtrusive way. Port can be specified as a property: This library wraps Kafka's embedded test cluster, allowing you to more easily create and run integration tests using JUnit against a "real" kafka server running within the context of your tests. Feb 21, 2018 · PROBLEM. Mar 11, 2021 · The Avro schema registry supports a "mock" pseudo-protocol: schema. Hamcrest is commonly used with JUnit and other testing frameworks for making assertions. Map<String, String> headers = new HashMap <>(); Aug 16, 2022 · I need some help with building a Junit test case for my Java kafka consumer. dius. To use it, create a test class and then add the rule: 1. Star 630. For this post, we will be using the offical Apache Kafka client library to implement our own producer and consumer in a Java application. Testcontainers can be used to automatically instantiate and manage Apache Kafka containers. property=my. . Contribute to mmarcosab/kafka-consumer development by creating an account on GitHub. spring. Mar 10, 2021 · 1. If you want to actually run these examples, then you must first install and run Apache Kafka and friends, which we describe in section Packaging and running the examples. You switched accounts on another tab or window. You can test whether your application has received data from the topic. assert how many times the consumer was invoked. bat --bootstrap-server localhost:9092 --topic test --from-beginning. master test_kafka_produce. Go to each sub project. java Jun 19, 2018 · I have a kafka consumer which is subscribing on a topic. @ClassRule. Custom Serialiser: Jan 10, 2023 · JUnit 5 integration test with Spring Cloud Stream and embedded Kafka - DemoApplication. pem file so that it finally looks like this: Kafka . To test a Kafka Streams application, Kafka provides a test-utils artifact that can be added as regular dependency to your test code base. All the configuration of Kafka is on the application. To send all of the events below, paste the following into the prompt and press enter: fun-line:All streams lead to Kafka event-promo:Go to Current event-promo:Go to Kafka Summit fun-line:Consume gently down the stream. You should not use the kafka template to verify the Pact message, you might have created the test Object for unit testing in order to test the Messages you can use the same test Objects. For example, a spring. java. I was helping someone write their first unit test in Apache Camel - the route was basic. My Kafka Consumer code is wrapped within the KafkaStreamObtainer class. xml. KarateKafkaProducer' ) Add this topic to your repo. {"payload":{"allShortcutsEnabled":false,"fileTree":{"avro-serializer/src/test/java/io/confluent/kafka/serializers":{"items":[{"name Aug 26, 2020 · You are consuming from a topic device - consumer: partitions assigned: [device-0, device-1] but it looks like you are publishing to a topic called My-Test-Topic - Auto creation of topic My-Test-Topic with 2 partitions and replication factor 1 is successful. Just like a real-time running application, these tests use the KafkaAutoConfiguration to create the context for the kafka logic. When running my unit test I can see outputs suggesting that my producer and consumer are working correctly in the console. type( 'karate. The loading and binding of {@link KafkaTopicProperties} is one of. Kevded/integration-test-spring-kafka-with-embedded-kafka-consumer-and-producer This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Read the documentation here Jul 15, 2021 · Expecting Junit to. During the test, the Kafka producer (in Camel's view) can be swapped in with a direct component and mock messages can be delivered there. Jan 8, 2024 · Furthermore, Kafka provides a MockProducer that implements the same Producer interface and mocks all I/O operations implemented in the KafkaProducer: @Test void givenKeyValue_whenSend_thenVerifyHistory() {. Start with the most basic avro setup. properties = "spring. js. Learn more from the wiki and the smart projects using Zerocode. Note:- I have tried searching but in most of the cases they are creating a new consumer in test classes to verify instead of invoking the actual consumer class. com. I want to initialize ConsumerRecords and use that in mock but the constructors of ConsumerRecords expect actual kafka topic which I don't have in tests. java Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container. kafka-avro-serializer here as well. The table below helps guide you to the right Testkit implementation depending on your programming language, testing framework, and use (or not) of Docker containers. kafka</groupId>. Each line represents input data for the Confluent Parallel Consumer application. Mar 21, 2018 · For such testing I've used EmbeddedKafka from the spring-kafka-test library (even though I wasn't using Spring in my app, that proved to be the easiest way of setting up unit tests). To see if your routes are processing those messages properly, Mock endpoints can be used. Jul 15, 2022 · In the following example, we will create a simple NBA (National Basketball Association) contract themed Spring Boot, Maven, JUnit 5 application which will implement a Kafka consumer that will generate a contract. brokers}", Start the local cluster with. 9+ and Apache Spark 1. Add the Pact Rule to your test class to represent your provider. We need an example on how to test ReactiveKafkaConsumerTemplate and ReactiveKafkaProducerTemplate with an embedded-kafka-broker. MockServer; import au. I have a working spring boot test, which is actually sending and receiving messages over a Kafka host. Discussions. Implementation is working fine. This will start and stop the broker between each test invocation. 4, and JUnit 5. The complete post with details is on The Practical Developer website: Spring Boot and Kafka - Practical Configuration Examples. apache. Mar 5, 2021 · Part 4: Using Kafka for JUnit with Spring Kafka. create ()); To spin up the broker at the beginning of a test suite and tear it down at the end, use @ClassRule. We’ll be focusing on setting up a KafkaConsumer without relying on Spring Boot modules. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. It provides a KafkaProducer and KafkaConsumer that can be called from a Karate feature. I have to test one API, which internally calls Kafka producer and has Kafka consumer as well. 0</version> <scope>test</scope> </dependency> Initialize the project. For this example, we first create a new topic "kafkaMultiPartitionTopic" with 3 partitions and also add it to our application. Overview. Updated 4 hours ago. Zerocode allows you to create, change and maintain your test scenarios without writing code. assignment () method returns the set of partitions currently assigned to the consumer. Oct 22, 2020 · 1 Answer. yml file under resource folder. bootstrap-servers=${spring. We generally recommend using the Test Binder in tests but if you want to use an embedded kafka server, it can be done Add this to your POM <groupId>org. against a local Kafka cluster. junit. With the code below, JUnit 4. // tell Spring Boot Kafka auto-config about the embedded kafka endpoints. confluent. <scope>test</scope>. A tag already exists with the provided branch name. You can have your custom de-serializer accordingly to use custom ReactiveKafkaConsumerTemplate. You can use WireMock. Oct 18, 2019 · You can accomplish a great deal by implementing your own Kafka consumers. @Rule public KafkaJunitRule kafkaRule = new KafkaJunitRule ( EphemeralKafkaBroker. Share. You will need the maven package io. Next, create a directory for configuration data: mkdir configuration. What I have so far is: import au. demo application for testing a Kafka consumer with Avro message schema with Testcontainers using Kafka with embedded Zookeeper and no Schema Registry container Testing a Kafka consumer application is not too complicated thanks to the MockConsumer. But if your application uses Apache Avro for serialization, and you do not use Confluent Schema Registry (which is the case when you want to use spring-kafka-test for testing) then you have a problem. Streaming: This contains an application that uses the Kafka streaming API (in Kafka 0. Example pom. For component-tests, we kept the scenarios quite simple and built a minimal producer and consumer on top of the official kafka-clients library for Java. Get started with Spring and Spring Boot, through the Learn Spring course: >> CHECK OUT THE COURSE. // the main things we're testing in this suite. Benefits. I'm using JUnit 5, so I can׳t initialize it using @Rule, I tried to use this example at Junit 4: Dec 25, 2020 · 2 branches 0 tags. verifier. A great alternative to the examples in this repository, which require you to operate a Spark or Storm processing cluster: build elastic, distributed, fault-tolerant stream processing applications with Kafka's Streams API (read: no Jun 18, 2017 · To automate this : You can validate/assert that that the message has successfully landed in a topic (also a partition). Simple java junit test of an apache kafka producer - KafkaProducerTest. I am attempting to unit test a kafka producer that sends an Integer. #1) The Console message and timestamp under the JUnit result tab display as it was in the earlier example. @Rule. (latest pact) (master/master pact) This is an example of a Java kafka consumer that uses Pact, PactFlow and GitHub Actions to ensure that it is compatible with the expectations its consumers have of it. xml snippet when using Maven: <groupId>org. In this tutorial, we’ll learn how to create a Kafka listener and consume messages from a topic using Kafka’s Consumer API. Running a single node Kafka installation with just one line of code. Kafka. brokers. Assume we have some KafkaListener, which accepts a RequestDto as a Payload. To unit test your route, you may do that with a standard camel spring boot test. Jun 3, 2021 · In general, if you have to test that the Http Request is populated with right URL, headers, body, etc. performance kafka messaging queueing kafka-consumer. To review, open the file in an editor that reveals hidden Unicode characters. That is the producer is sending a value of zero, the consumer received zero, and totaled that integer with the running total. src/ main. class) is a JUnit custom runner to run the test; e. something Basically anything with mock as prefix will do the job. Reload to refresh your session. confluentinc / parallel-consumer. mmarcosab del arquivos. 10. We want to test our Kafka messages with pact. <artifactId>spring-kafka-test</artifactId>. registry. poll() which returns instance of ConsumerRecords<String,String>. Apache Kafka is a powerful, distributed, fault-tolerant stream processing system. bootstrap-servers entry can be added into a junit-platform. The Java application will use a standard maven project structure. Oct 12, 2018 · 1. In your test class you should create a TestConfiguration in order to create producer beans and to autowire KafkaTemplate into your test. Contribute to kranonit/calculator-unit-test-example-java development by creating an account on GitHub. See more information about configuration properties and how to provide them in the JUnit 5 User Guide. Then we will test this Kafka Listener using the Testcontainers Kafka and MySQL modules in conjunction Then on the consumer side by turning on the stubs per consumer feature only respective stubs for the given consumer will be used. After that, you should be able to execute the examples following each example’s readme’s instructions. kafka. ConsumerFactory, ProducerFactory) These tests are running rather quickly. Introduction. This project provides a library to test Kafka applications using KarateDSL . Jan 8, 2024 · Testing. Jan 8, 2024 · In this article, we’ve explored how to use MockConsumer to test a Kafka consumer application. – Nov 16, 2016 · Unit testing your Kafka code is crucial, especially for your Consumers. I have a spring boot application that uses a Kafka consumer and producer. To associate your repository with the kafka-consumer topic, visit your repo's landing page and select "manage topics. 3. In this lab, we will work with consumer test fixtures by writing a few unit tests for an existing consumer. A modern Apache Kafka client for node. To get started, make a new directory anywhere you’d like for this project: mkdir creating-first-apache-kafka-streams-application && cd creating-first-apache-kafka-streams-application. Thanks to @warmuuh we have a JUnit rule that simplifies running Pact consumer tests. class); You need to wrap it in a KPE. Dec 17, 2019 · 1. kafka-console-consumer. You signed out in another tab or window. Issues. embedded. Sep 12, 2020 · Learn how to implement a Kafka consumer in Java with this tutorial from GitHub Pages. Throwable ex = mock (Throwable. public PactProviderRule mockProvider = new PactProviderRule("test_provider", "localhost", 8080, this); Kafka Containers. This example will demonstrate usage of Kafka with multi-partitioned topic with two consumer groups. 736a435 on Dec 25, 2020. Visit documentation below: - Kafka Testing Introduction · authorjapps/zerocode Wiki. ProducerRecord<String, Employee> producerRecord = ((KafkaProducerException) ex). The Testkit provides a variety of ways to test your application against a real Kafka broker or cluster using Testcontainers (Docker). Hardcoded port in the sample is used for simplicity. We are going to create a Spring Boot project with Kafka, Spring Data JPA and MySQL , where we implement a Kafka Listeners which receives an event payload and persists the event data in the database. Following which we will define a producer and see how, using Pact we can ensure that the contract between the two services is upheld. Thanks. public static KafkaEmbedded embeddedKafka = new KafkaEmbedded (2, true, 2, "messages"); This would start up a Kafka Cluster with 2 brokers, with a topic called “messages” using 2 partitions and the class rule would make The Spring Kafka project comes with a spring-kafka-test Maven library that contains a number of useful utilities such as embedded Kafka broker, static methods to setup consumers/producers and to fetch results. Test is effectively: send a message to the topic. But when trying to implement unit tests for that, there's a problem because of it's implementing by Runnable interface. we can now check all the messages produced under the Kafka topic “ test ” using the following command. ofSeconds( 10 )); We build and test Apache Kafka with Java 8, 11, 17 and 21. Code examples that show how to integrate Apache Kafka 0. But now I don't want to actually use Kafka in the integration test as I was facing lag with Kafka messages, i want to mock the part where Kafka Start the spring boot application and also hit the endpoint “ /produce ” with a proper input body as shown below. Showcases error handling, payload consumption, listener creation, junit testing, health endpoint, and more. Jan 10, 2024 · Overview. js: Publish messages on a topic and then consume them in a new consumer group while capturing custom metrics for the number of messages published, consumed, and the E2E latency. MockProducer mockProducer = new MockProducer <>( true, new StringSerializer (), new StringSerializer ()); In order to get the contract verification results replayed to the Pact-Broker it's necessary to set the property pact. Work In Progress. In the internet I found some JUnit 4 examples and some examples with JUnit 5 and REST. key file and copy its contents and paste it at the bottom of your . Sorted by: 1. Refactor the code that consumes data from the Consumer object to be callable from the unit test and not get stuck in an infinite loop. This project contains example tests for a Kafka cluster that can be run on the Testable platform. 0. pom. Code. sh Mar 7, 2024 · On executing the JUnit class, the console and JUnit result tab shows up the below. First, we’ve looked at an example of consumer logic and which are the essential parts to test. the EmbeddedKafkaBroker of this library is provided for creating an embedded Kafka and an embedded Zookeeper server. Write an Avro producer. In our project we use JUnit 5. Also, you can interactively test-drive these examples, e. If you want to write integration tests using EmbeddedKafka, then you can do something like this. sending data = 0. An example : Feature: Kafka Producer and Consumer Demo Background : * def KafkaProducer = Java. #2) The difference with this change is in the JUnit results tab. springframework. yml spring: kafka: consumer: enable-auto-commit: Kafka for JUnit enables developers to start and stop a complete Kafka cluster comprised of Kafka brokers and distributed Kafka Connect workers from within a JUnit test. Contribute to nieuwo/kafka-dotnet-sample development by Jan 11, 2024 · We need to use the @Pact annotation and pass the consumer name for which the contract is defined. For Kafka Streams, since it's a client library for Kafka, you can start up Kafka docker Test Container (and maybe Zookeeper) before the test, set it up to create the required topics and you're good to go. Kafka for JUnit enables developers to start and stop a complete Kafka cluster comprised of Kafka brokers and distributed Kafka Connect workers from within a JUnit test. We can simply use mock consumer to process some data you’ll feed into it. Unit Testing Camel 3, Spring-boot 2. Contains all JUnit 5 Examples and Tutorial. Following the above implementation, you could open dynamic ports per test class and, it would be more convenient. We set the release parameter in javac and scalac to 8 to ensure the generated binaries are compatible with Java 8 or higher (independently of the Java version used for compilation). In fact, these unit tests don't so much test anything as produce speed data so that different configurations of Kafka producers can be adjusted to get optimal performance under different - GitHub - DLaMott/spring-boot-kafka-consumer: Spring Boot Kafka Consumer example built using Gradle. kafka_test_server. Example Java Kafka Consumer. Dec 11, 2016 · On a unit test that I am writing, I have the following code below to test out that my Kafka Consumer is obtaining stuff from any relevant Producer. yaml. This project includes JUnit tests designed to find which Kafka configurations will maximize the speed at which messages can be published to a Kafka stream. A community-developed, free, opensource, automated testing framework for microservices APIs, Kafka (Data Streams) and Load testing. 5 commits. Inside of the annotated method, we can define our GET contract: @Pact(consumer = "test_consumer") public RequestResponsePact createPact(PactDslWithProvider builder) {. README. bootstrap-servers=$ {spring. g. This can rather be done by setting the property via the failsafe-plugin (which we use to run our integration tests) like so: <plugin>. Specifically, instead of using JUnit's numerous assert methods, we only use the API's single assertThat statement with appropriate matchers. Failed to load latest commit information. Producer-Consumer: This contains a producer and consumer that use a Kafka topic named test. properties file in the testing classpath. cd _INFRA/dev/kafka && docker-compose up. //Route definition. What we are going to achieve in this guide. Commands: In Kafka, a setup directory inside the bin folder is a script (kafka-topics. You will find out how to configure the consumer properties, handle errors, and process records in batches. In a previous tutorial, we learned how to work with Spring and Kafka. In the same end-to-end test, we can perform two steps like below for the same record (s): Step 1: Produce to the topic "demo-topic" and validate the received You signed in with another tab or window. You can find the full implementation here. md. Dec 11, 2019 · 2 Answers. Parallel Apache Kafka client wrapper with per message ACK, client side queueing, a simpler consumer/producer API with key concurrency and extendable non-blocking IO processing. Instead it turned into days of dead ends, missing docs Jan 8, 2024 · The KafkaConsumer. kafka_consumer_test. dsl. <artifactId>kafka-streams-test-utils</artifactId>. Zerocode Open Source enables you to create, change and maintain your automated test scenarios via simple JSON or YAML files. The last articles gave a couple of examples on how to write Kafka-enabled integration tests at various levels of abstraction using Kafka for JUnit. app reads the message and does something. brokers} This assignment is the most important assignment that would bind the embedded instance port to the KafkaTemplate and, KafkaListners. To execute the examples, checkout into the tag for the latest release. 1. jupiter</groupId> <artifactId>junit-jupiter-engine</artifactId> <version>5. #JUnit 5 Examples. It is also necessary to have the following dependency (already implemented): <dependency> <groupId>org. Then, we tested a simple Kafka consumer application using the MockConsumer. 8+ with Apache Storm 0. This tutorial is suitable for beginners and intermediate users who want to master the basics of Kafka consumer API. Basically Kafka brokers send the acknowledgement in form of "recordMetadata". url= mock://localhost. Like almost any source code, it is a good idea to build unit tests to verify the functionality of your consumer code. Running a single node Kafka installation with just one line of code; No need to manage external Zookeeper installation, required by Kafka. More precisely Testcontainers uses the official Docker images for Confluent OSS Platform. Import source code into Eclipse. pact. poll(Duration. 6. getFailedProducerRecord(); Your mock is not calling the callback with a KPE, its calling it with this. " GitHub is where people build software. 0 or higher) that reads data from the test topic, splits the data into words, and writes a count of words into the wordcounts topic. Dec 1, 2016 · With this dependency in place, an Embedded Kafka can be spun up in a test using the @ClassRule of JUnit: 1. properties contains the "Broker" details and Producer/Consumer configs @RunWith(ZeroCodeUnitRunner. Since the KafkaConsumer is well tested, we don’t need to use a live consumer and Kafka broker. Net Core Producer and Consumer . It makes tests more realistic and relieves from the need to manually create the objects necessary for Kafka consumer (e. Simple jUnit test example. The Failures count now shows 1, with a red bar implying that the testcase has failed. PactDslJsonBody; This sample application shows how to use basic Spring Boot configuration to set up a producer to a topic with multiple partitions and a consumer group with three different consumers. Sep 27, 2016 · I am writing test cases for kafka consumer components and mocking kafkaConsumer. Contribute to tulios/kafkajs development by creating an account on GitHub. For example: $ git checkout tags/camel-spring-boot-examples-4. For tests, an Feb 28, 2021 · 28 Feb 2021Unit Testing Camel 3, Spring-boot 2. May 3, 2018 · A JUnit test suite was the first idea that came to my mind. My Original source code has the method as below, and need to create a Unit test case for the same. To use JUnit in Maven, it is necessary to put the test classes under src/test/java. 2. producer_with_junit4 The producer application using JUnit 5 Apr 13, 2018 · I'm trying to send a message from Kafka listener in the same transaction to have message sending and offset committing in the same transaction but receives an exception: Invalid transition attempted from state IN_TRANSACTION to state IN_ About. More than 100 million people use GitHub to discover, fork, and contribute to over 420 million projects. Then, install the root pom: $ mvn install. It's not an optimal solution when there are a lot of tests using Kafka. Aug 15, 2019 · I'm trying to write an integration test for my Kafka consumer. 1+ while using Apache Avro as the data serialization format. But when a test suite is used Kafka-related tests can only be executed from the central class (suite class). We use autoconfigure magic to create a producer bean from application. See the "verify" section below. Refactor your Consumer code to be able to change it at runtime and create a separate method for creating the KafkaConsumer. Oct 20, 2020 · Producer and Consumer Testing. {"payload":{"allShortcutsEnabled":false,"fileTree":{"src/test/java/com/example/integrationtestspringkafka/service":{"items":[{"name":"ConsumerServiceIntegrationTest Apr 11, 2023 · 1. Are you looking for a free, opensource, automated testing framework for microservices API, Kafka and Load testing? Zerocode is the answer. @KafkaListener(topics = "${kafka-receiver-topic}") public void receiveTopic(ConsumerRecord<?, ?> consumerRecord) throws Exception { JSONObject kafkaObject = new Apr 24, 2022 · Now, we will write integration tests for testing the logic of producer and consumer application and use Testcontainers to start the kafka cluster. I’ve used many testing frameworks before so I thought this would be quick and simple. See a sample below. You can test if your application is sending data to the correct topic. After that, we’ll test our implementation using the Producer API and Testcontainers. Finally, polling the same consumer again for messages now reads all the messages from the beginning of the partition: ConsumerRecords<String, String> records = consumer. consumer. Consumer: Consumes records from the broker. iv tm as qu wu ok kk um gi dk