Quarkus and WireMock. Dev Services for your projects

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Oleg Nenashev @oleg_nenashev

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NOTE: ● This presentation was modified on Oct 10, 2025, to exclude IP of Gradle Inc. ● Quarkus Plugin for Gradle Build Tool is no longer included in slides ● Gradle®, Develocity®, Build Scan®, and the Gradlephant logo are registered trademarks of Gradle, Inc. "Gradle" means "Gradle Build Tool" and does not reference Gradle, Inc. and/or its subsidiaries. Former Edition at Türkiye Java Community, May 2024:

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> whoami @oleg_nenashev oleg-nenashev Dr. Nenashev / Mr. Jenkins Developer tools hacker Community builder FOSS/DevRel consultant #RussiansAgainstPutin #StandWithUkraine

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speakerdeck.com/onenashev

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5 rts.ch/info/regions/neuchatel/12836885-la-population-neuchateloise-en-hausse-malgre-un-recul-dans-les-montagnes.html

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My Open [and not so] Communities Time * Once a contributor, [almost] always a contributor Neuchâtel

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> whoami --quarkus ● Jenkins on Quarkus experiments ● Jenkinsfile Runner native exec with Quarkus ● FaaScinator pet project 7

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wiremock.org wiremock.org

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> whoami --quarkus ● Jenkins on Quarkus experiments ● Jenkinsfile Runner native exec with Quarkus ● FaaScinator pet project ● WireMock Dev Service 9

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speakerdeck.com/onenashev/developing-apps-with-quarkus-and-wiremock Presented at customer/ community meetings Soon: JCON, JUG.ch

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Quarkus is great for building REST APIs 11 ● Built-in support ● Many extensions ● Developer experience code.quarkus.io

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APIs

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13 Source: https://medium.com/10-minutes-qa-story/api-testing-from-scratch-api-anatomy-f220856ce9b3

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Ways to do API integration testing 1. Testing against Production/Staging servers 2. Testing against a simplified/containerized instance (e.g. Testcontainers) 3. Modeling (aka Mocking) at the API provider level (e.g. WireMock or Microcks) 4. Mocking at the code level by instrumenting it (Mockito, PowerMock) 18 Slow Fast Nope Accu- rate * For Testcontainers, see the slides

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19 wiremock.org/docs/stubbing IF (request_url) THEN (response) * * it gets MUCH more complex WireMock Config JSON: Client library response request Client App Mock API Server HTTP/2 API Mocking 101

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API Mocking for Quarkus 20 Main implementation in Java Native lib, Docker images and Testcontainers modules Support for GraalVM Unofficial Quarkus Dev Service Sandbox CNCF Project Golang / Microservice arch Docker image, Testcontainers module Unofficial Quarkus Dev Service

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21 Staging & QA Tests Build Integration tests Build Tests Gaining confidence in you software “Shift Left”

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WireMock Ecosystem & Features 22 wiremock.org/docs

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WireMock Ecosystem & Features 23 wiremock.org/docs

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25 Quarkus Dev Services Powered By: ● Quarkus Extensions ● Quarkus Extensions + Testcontainers ● Compose Specification: https://compose-spec.io Quarkus supports the automatic provisioning of unconﬁgured services in development and test mode. We refer to this capability as Dev Services

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Quarkus Dev Services Configuration in application.properties 26

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Quarkus Dev Services May be complex runtimes, with UI, etc. 27

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28 docs.quarkiverse.io/quarkus-wiremock/dev/index.html

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29 docs.quarkiverse.io/qu arkus-wiremock/dev/in dex.html#extension-co nfiguration-reference

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Code-only Mode 30 docs.quarkiverse.io/quarkus-wiremock/dev/index.html

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github.com/wiremock/wiremock-quarkus-devservice-demo

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Resource Deﬁnition 32

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@QuarkusTest or @QuarkusIntegrationTest 33

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And a Quarkus Dev Service! docs.quarkiverse.io/quarkus-wiremock/dev/index.html 34

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What I’m looking forward to? ● Feedback on tools we used ● Promoting WireMock and Microcks Dev Services as official ones ● Quarkus developer experiences 36

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References My demo: ● with Apache Maven: github.com/wiremock/wiremock-quarkus-devservice-demo ● with Gradle Build Tool: github.com/oleg-nenashev/gradle-quarkus-plugin-demo WireMock extension for Quarkus: ● https://docs.quarkiverse.io/quarkus-wiremock ● https://github.com/gscaramuzzino/quarkus-wiremock-testing ● https://quarkus.io/guides/getting-started-testing#quarkus-test-resource 37

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GitHub: oleg-nenashev Twitter: @oleg_nenashev QUESTIONS? Quarkus on Zulip, https://quarkusio.zulipchat.com