Workshop - Mocks as Code. Modeling services in Config Management integration tests

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Oleg Nenashev, @oleg_nenashev CNCF Ambassador

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> whoami @oleg_nenashev oleg-nenashev Dr. Nenashev / Mr. Jenkins Community builder Developer Tools Hacker #RussiansAgainstPutin #StandWithUkraine

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Async Q&A: Testcontainers Slack speakerdeck.com/onenashev

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5 Staging & QA Tests Build Integration tests Build Tests Gaining conﬁdence in you software “Shift Left” with modern tools

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“Shift Left”, they said? YAML, they gave? 6

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7 Java All the Way Down Up Application Unit Tests Build Deﬁnition and Pipelines Integration Tests Infrastructure-as-Code Deployment Pipelines Deployment Tests Production Health Checks Java the stack up all the way

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Today 8 1. Containerizing Spring App Development 2. Integration testing with Testcontainers and LocalStack 3. Mocking APIs with WireMock 4. Infrastructure as Code (IaC) with Pulumi 5. Testing IaC locally 6. Advanced Troubleshooting Localstack

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Our Repository github.com/oleg-nenashev/mocks-as-code-demo git clone it

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Workshop Prerequisites ● Internet :( ● Java 17 & your favorite IDE ● Testcontainers-compatible Docker environment ○ Tested on: Docker Desktop ○ You can use: Podman, Colima, Rancher Desktop (list) ○ OR: Testcontainers Cloud ● Pulumi CLI + registration ○ Guide: www.pulumi.com/docs/install/ 10

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Our Application 11

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12 AWS S3 SQS External API Our Application

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Credits 13 ● Siva Prasad Reddy and Oleg Shelajev, Docker ● The demos are based on: ○ github.com/testcontainers/tc-guide-testing-aws-service-integrations-using-loca lstack ○ github.com/testcontainers-community/testcontainers-wiremock-demo

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Integration Testing? 14 github.com/oleg-nenashev/mocks-as-code-demo/ tree/main/2_api_mocking

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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 Slow Fast Nope Accu- rate * For Testcontainers, see the slides

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19 https://martinfowler.com/articles/ mocksArentStubs.html

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21 SDKs testcontainers.org … and

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22 github.com/testcontainers/ testcontainers-go

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Example - Java 23

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24 LOCAL STACK LocalStack Module K3s Module

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25 Localstack www.localstack.cloud

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LocalStack ● Local AWS Services emulation OR mocking ● “awslocal” CLI utility ● SDKs for languages and test frameworks 26 docs.localstack.cloud/

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27 x.com/dastbe/status/1303858170155081728

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Some of Them 28 ● Emulated: S3, SQS, … ● Mocked: EC2 (in the FOSS lib) ● Thoughts & Prayers: AWS GreenShift ;) ● …

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Demo Time 29 github.com/oleg-nenashev/mocks-as-code-demo/ tree/main/1_application

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No Implementation? 30 Fake it until you “$ make it”

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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 Tools Main implementation in Java Native lib, Docker images and Testcontainers modules Support for GraalVM Rich Ecosystem Sandbox CNCF Project Golang / Microservice arch Docker image, Testcontainers module, All-in K8s Charts Less Rich Ecosystem

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WireMock Ecosystem & Features wiremock.org/docs

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WireMock Ecosystem wiremock.org/docs

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WireMock in Java wiremock.org/docs/stubbing

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WireMock Ecosystem / Java ● Java ● Kotlin ● Scala ● Groovy ● Clojure ● (?)Android 37 ● JUnit 4/5 ● Testcontainers ● Sprint Boot ● Spring Cloud Contract ● Quarkus ● Maven / Gradle Build Tool ● Spock ● Pact

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Example - JUnit 5 38

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

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Demo Time 40 github.com/oleg-nenashev/mocks-as-code-demo

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41 Infrastructure-as-Code, for real

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43 And more constructive!

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HOWTO: JavaDev-Ops 44

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Enter -as-Code Tools! ● Infrastructure as Real Code ● SDKs for programming languages ● Standard IDEs ● Standard Developer Tools ● Extensibility via libraries 45

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● Open-Ecosystem Tool for Infra-as-Code ● Open Source SDKs 46

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● Multiple destinations 47 www.pulumi.com

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● 120+ extensions: www.pulumi.com/registry/ 48 www.pulumi.com

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Pulumi for Java 49 pulumi.com/docs/languages-sdks/java/

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build.gradle 50

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51 Java All the Way Down Up Application Unit Tests Build Deﬁnition and Pipelines Integration Tests Infrastructure-as-Code Deployment Pipelines Deployment Tests Production Health Checks Java the stack up all the way

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52 Localstack

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Pulumi Local ● github.com/localstack/pulumi-local ● Setting the environment and the conﬁguration right ● Just a script 53 Localstack

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Hacking Time! 56 github.com/oleg-nenashev/mocks-as-code-demo/ tree/main/3_deployment

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When it Goes wrong 57

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Demo Time 61 github.com/oleg-nenashev/mocks-as-code-demo

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Lessons Learned 62

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Beware Pulumi for AWS Native ● AWS Native conﬁguration is not applied for endpoints ● APIs are slightly different in the package 63

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68 Java All the Way Down Up Application Unit Tests Build Deﬁnition and Pipelines Integration Tests Infrastructure-as-Code Deployment Pipelines Deployment Tests Production Health Checks Java the stack up all the way

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What I’m looking forward to? ● Feedback from Java developers ● Is Infra-as-Code with Java interesting to you? ● Do you want Pulumi-LocalStack for Java productization? ● Any other feedback on dev tools :)

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References ● Main Demo: github.com/oleg-nenashev/mocks-as-code-demo ● This presentation: speakerdeck.com/onenashev/ workshop-mocks-as-code-in-cfg-mgmt

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Keep Learning Tools 71 * AKA: Burning Out 101

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It’s [always] a great time to contribute! testcontainers.org/contributing wiremock.org/participate 73

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GitHub: oleg-nenashev Twitter: @oleg_nenashev Questions? 74