SIMPLIFYING CLOUD-NATIVE APP TESTING

ACROSS ENVIRONMENTS

Who we are!

Mauricio Salatino

^@salaboy

Laurent Broudoux

^@lbroudoux

CNCF Ambassador, Java Champion,

Dapr ecosystem @ Diagrid

Cloud native Architect @ Postman

Microcks founder

Agenda

• Cloud Native Environments, Kubernetes and cross-environment portability challenges
• Testing distributed applications, enabling teams to go faster
• Dapr and Microcks

The Pizza App Demo 🪄

https://github.com/salaboy/pizza

How companies solve these challenges?

• They use APIs to abstract away complexity
• They create frameworks and tools that allow developers to be consumers of shared functionality
• They abstract away the complexity of the different environments behind APIs, so operations teams can configure the same application to run across environments

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Abstract away the complexity of a system behind APIs.

​

A different approach

Push the problem down to the runtime

Demo 🪄

Great, it runs on Kubernetes, but how do we run this locally

Demo 🪄

Oops… I added a

new service dependency…

DevEx & DISTRIBUTED APPS - WHAT A BURDEN!

DevEx & DISTRIBUTED APPS - WHAT THE HELL!

The Developer’s Laptop

OK BUT …

LOTS OF COMPLEXITY

LOTS OF POWER / ENERGY

LOTS OF MONEY!

DevEx & DISTRIBUTED APPS -

TAKING SHORTCUTS

• Avoid Testing Integrations
• Use mock frameworks only
• In-VM vs Network
• Rely on your own vision

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FROM DISTRIBUTED APPS to PROMISES to …

Services

& APIs

Promises

Contracts

MICROCKS

Turn Artifacts into light & smart simulations

INGEST

PROVIDE

MOCKS

WELL-KNOWN ARTIFACTS

🧠 SMART MOCKS

API Consumer

and others

MICROCKS

Turn Artifacts into Contract Testing Suite

INGEST

WELL-KNOWN ARTIFACTS

AUTOMATIC TEST SUITE

and others

VALIDATE

REAL API

API v1.2

API v1.1

API v1.0

API Provider

Inner or Outer Loops: Choice is yours!

Setup

Code

Build

Test

Push

Review

Build

Conform-ance

Security

Deploy

Inner loop

Outer loop

Pull/Merge Request

Developer

Team

Microcks

Microcks

Microcks

Demo 🪄

Contract Testing in Action!

• Start your Application
• Include a library like RestAssured
• Call API endpoint and check:
• Response status code
• Response content-type
• JSON evaluation
• JSON response is valid on all paths
• Loop on next call…

Typical approach

Contract Testing in Action!

• Include Microcks and OpenAPI
• Launch a Microcks Test

​

​

​

• AssertSuccess

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Microcks approach

✨ : managed by Microcks Testcontainers tests

Usual Testing Nightmares (i) 😱

• Include a mocking library
• Prepare Mock object for DaprMessagingTemplate.send()
• Check that messagingTemplate.send() has been called
• Tear-down all resources

Typical “light” approach

Usual Testing Nightmares (i) 😱

Microcks approach

✨ : managed by Microcks Testcontainers tests

• Include Microcks and AsyncAPI
• ​
• Launch a Microcks Test
• Invoke KitchenService.emitEvent()

• Start a Kafka broker

• Check that messagingTemplate.send() has been called
• + that message is sent over the wire
• + that message is on correct Kafka topic
• + that message is conformant to schema
• Tear-down all resources

✨

​

✨

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Usual Testing Nightmares (ii) 🤯

• Prepare an Event object
• Invoke PizzaStore.receiveEvents() handling function
• Check that DeliveryService has been called
• Tear-down all resources

Typical “light” approach

Usual Testing Nightmares (ii) 🤯

• Include Microcks and AsyncAPI
• ​
• ​
• ​

​

• ​
• Check that DeliveryService has been called

• Tear-down all resources

Microcks approach

• Start a Kafka broker
• Publish mock messages on Kafka
• Check that PizzaStore.receiveEvents() is connected and can read message
• Check that consumer deserialization is ok

✨

​

✨

​

✨ : managed by Microcks Testcontainers tests

Wrap-up

KEY LEARNINGS

• Building distributed applications is hard…
• Making these apps portable across environment is possible by using APIs, check out the Dapr Spring Boot integration!
• Still, the Developer Experience can be a pain…
• Microcks makes contracts finally useful!

for a better Developer Experience!

THANKS!!!

Feedback is Gold! 💛