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Developing subatomic apps With Quarkus and WireMock Oleg Nenashev, WireMock Inc

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

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

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WireMock Cloud by WireMock Inc. 4 ● WireMock creator is a co-founder of the Inc. ● WireMock Cloud - SaaS for end-to-end API mocking ● Private beta: K8s Edition for managed / on-premises wiremock.io

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Outline ● Intro to API integration testing and WireMock ● Using WireMock and Quarkus ● And examples! 5

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> whoami --quarkus ● Jenkins on Quarkus experiments ● Jenkinsfile Runner native exec with Quarkus ● FaaScinator pet project (Stale) ● Wishlist: WireMock + Quarkus image 6

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Docker image for OpenFaaS openfaas/of-watchdog AdoptOpenJDK JDK/JRE Service Wrapper GET / run function GET /help GET /usage GET /schema Config and schema (env vars, sys prop) User CLI app Quarkus github.com/oleg-nenashev/faascinator ¡Stale project!

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APIs are essential for Integration Testing 9 GROWTH IN WEB APIS SINCE 2005 Over 90% of developers use APIs. Skyrocket growth of APIs JANUARY 2006 JANUARY 2008 JANUARY 2010 JANUARY 2012 JANUARY 2014 JANUARY 2016 JANUARY 2018 MONTH The growth over time of the Programmable Web API API directory to more than 22,000 entries 22000 20000 18000 16000 14000 12000 10000 8000 6000 4000 2000 0 TOTAL API COUNT Programmable Web * Gartner Hype Cycle for APIs, 2022

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APIs

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

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xkcd.com/303 www.jenkins.io/artwork

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xkcd.com/303 www.jenkins.io/artwork

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Source: https://en.wikipedia.org/wiki/Groundhog_Day_(film)

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

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23 Build Unit tests Publish Reports Integration tests Publish Reports WAS

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Integration testing? 24 ● Multiple technology stacks and toolchains ● Many teams involved ● Sacred knowledge ● [Almost] always too late

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25 Build Unit tests Publish Reports Integration tests Publish Reports NOW “Shift Left” Fast integrations tests are critical

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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. Mocking at the API provider level (e.g. WireMock) 4. Mocking at the code level 26 Slow Fast Accu- rate Nope

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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) 4. Mocking at the code level 27 Slow Fast Nope Accu- rate

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

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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. Mocking at the API provider level (e.g. WireMock) 4. Mocking at the code level 30 Slow Fast Accu- rate Nope

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31 WireMock 101 WireMock is a tool for building mock APIs Created in 2011 as a Java test library and CLI Available beyond Java/JVM, inc Python or Golang You can can: ● Create stable development environments ● Isolate yourself from flakey 3rd parties ● Simulate APIs that don't exist yet wiremock.org

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32 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

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UI - WireMock Cloud Using WireMock Cloud app.wiremock.cloud 33

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WireMock in Java 34 wiremock.org/docs/stubbing

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WireMock Ecosystem & Features 35 wiremock.org/docs

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WireMock Ecosystem & Features 36 wiremock.org/docs

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WireMock & JVM Ecosystem - projects for… ● Java ● Kotlin ● Scala ● Groovy ● Clojure ● Android (in 2.x) 37 ● JUnit 4/5 ● Testcontainers ● Sprint Boot ● Spring Cloud Contract ● Quarkus ● (*)Micronaut ● Maven/Gradle ● Spock ● Pact

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38 WireMock has an official Testcontainers module! testcontainers.com/modules/wiremock

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Example - JUnit 5 39

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40 wiremock.org/docs/solutions/quarkus

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

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@QuarkusTest or @QuarkusIntegrationTest 42

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And a Quarkus Dev Service! ● https://quarkus.io/guides/dev-services 43

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44 https://docs.quarkiverse.io/quarkus-wiremock/dev/index.html# extension-configuration-reference

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github.com/wiremock/wiremock-quarkus-devservice-demo * for Spring Boot github.com/shelajev/testcontainers-wiremock-demo

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WireMock Public Roadmap 48 github.com/orgs/wiremock/projects/4

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WireMock and Quarkus wishlist ● WireMock official images on Quarkus ● WireMock native packaging with Quarkus ● Ext: Full configuration-as-code in WireMock, build-time configuration in Quarkus ● Ext: Support for WireMock in the proxy mode ● Ext: Testcontainers-based Dev Service: extensions and portability 49

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Wishlist - WireMock as a Proxy in Quarkus 50 Tests / Dev Real API Provider OR ● Fault injection ● Recording ● Protocol Verification

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Takeaways 52 ● Shift left your integration testing… as far as unit tests and developer environments ● Reduce external dependencies, mock APIs ● There are tools for that, including WireMock ● WireMock and Quarkus co-exist well

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Get Started wiremock.org/docs wiremock.org/docs/solutions/quarkus 53

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References My demo: TODO ● Similar one in Spring Boot: https://github.com/shelajev/testcontainers-wiremock-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 54

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THANK YOU Contacts: E-mail: oleg@wiremock.org GitHub: oleg-nenashev Twitter: @oleg_nenashev QUESTIONS? 55