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

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Oleg Nenashev, @oleg_nenashev CNCF Ambassador / Gradle Inc.

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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: Gradle Community Slack, Testcontainers Slack speakerdeck.com/onenashev

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4 Developer Productivity Engineering (DPE)

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DPE is Like SRE, but for Developer Productivity 5

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6 gradle.com/ developer-productivity-engineering

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

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8 Localstack

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“Shift Left”, they said? YAML, they gave? 9

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10 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 11 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/ ● Nice2Have: Gradle Build Scan account ○ scans.gradle.com/ 13

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Our Application 14

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15 AWS S3 SQS External API Our Application

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Credits 16 ● 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? 17 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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22 https://martinfowler.com/articles/ mocksArentStubs.html

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23 SDKs testcontainers.org … and

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24 github.com/testcontainers/ testcontainers-go

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Example - Java 25

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27 LOCAL STACK LocalStack Module K3s Module

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28 Localstack www.localstack.cloud

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LocalStack ● Local AWS Services emulation OR mocking ● “awslocal” CLI utility ● SDKs for languages and test frameworks 29 docs.localstack.cloud/

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30 x.com/dastbe/status/1303858170155081728

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Some of Them 31 ● Emulated: S3, SQS, … ● Mocked: EC2 (in the FOSS lib) ● Thoughts & Prayers: AWS GreenShift ;) ● …

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Demo Time 32 github.com/oleg-nenashev/mocks-as-code-demo/ tree/main/1_application

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No Implementation? 33 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 ● JUnit 4/5 ● Testcontainers ● Sprint Boot ● Spring Cloud Contract ● Quarkus ● Maven/Gradle ● Spock ● Pact

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Example - JUnit 5 41

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WireMock Plugin for Gradle 42 William-Hill-Online/wiremock-gradle-plugin

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

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Demo Time 44 github.com/oleg-nenashev/mocks-as-code-demo

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45 Infrastructure-as-Code, for real

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47 And more constructive!

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HOWTO: JavaDev-Ops 48

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Enter -as-Code Tools! ● Infrastructure as Real Code ● SDKs for programming languages ● Standard IDEs ● Standard Developer Tools ● Extensibility via libraries 49

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● Open-Ecosystem Tool for Infra-as-Code ● Open Source SDKs 50

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● Multiple destinations 51 www.pulumi.com

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● 120+ extensions: www.pulumi.com/registry/ 52 www.pulumi.com

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Pulumi for Java 53 pulumi.com/docs/languages-sdks/java/

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build.gradle 54

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55 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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56 Localstack

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Pulumi Local ● github.com/localstack/pulumi-local ● Setting the environment and the conﬁguration right ● Just a script 57 Localstack

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Hacking Time! 60 github.com/oleg-nenashev/mocks-as-code-demo/ tree/main/3_deployment

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When it Goes wrong 61

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66 gradle --scan Gradle Profiler Java Tools and IDEs Gradle Observability

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67 OpenTelemetry plugin for Gradle ● Injecting traces and spans to the Gradle execution ● Helps to ﬁnd the slowest parts of your build with the Gradle OpenTelemetry build plugin. ● Created by Craig Atkinson ● craigatk/opentelemetry-gradle-plugin

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68 Gradle tasks tracing github.com/craigatk/ opentelemetry-gradle-plugin

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Tests traces too! github.com/craigatk/opentelemetry-gradle-plugin

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But Not Insights? 71

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Based On True Events 72

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Gradle Build Scan & Develocity

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● For many open source projects: Gradle sponsors Develocity licenses/hosting, helps with build optimization and developer productivity ● Maven, Bazel and sbt projects welcome gradle/develocity-oss-projects

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works for Pulumi and Integration Tests Tool! 75

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Demo Time 76 github.com/oleg-nenashev/mocks-as-code-demo

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Lessons Learned 77

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Beware Pulumi for AWS Native ● AWS Native conﬁguration is not applied for endpoints ● APIs are slightly different in the package 78

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83 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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Move to Kotlin? blog.gradle.org/kotlin-dsl-is-now-the-default -for-new-gradle-builds ● 2023 - Kotlin is a default for Gradle build authoring ● Scripts, Plugins

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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 Gradle :)

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References ● Main Demo: github.com/oleg-nenashev/mocks-as-code-demo ● Gradle Build Scan: scans.gradle.com ● Credits: github.com/testcontainers/tc-guide-testing-rest-api-integrations-u sing-wiremock

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Keep Learning Tools 87 * AKA: Burning Out 101

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It’s [always] a great time to contribute! gradle.github.io/community/contributing testcontainers.org/contributing wiremock.org/participate 89

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GitHub: oleg-nenashev Twitter: @oleg_nenashev Gradle Community Slack, #developer-productivity-engineering Questions? Testcontainers Slack 90