Consumer Driven Contracts like TDD to the API - Olga Maciaszek-Shar...

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1 © 2019 Pivotal
Consumer Driven Contracts
like TDD to the API
Olga Maciaszek-Sharma, @olga_maciaszek
Marcin Grzejszczak, ...

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Spring Cloud developer at Pivotal
Working mostly on
● Spring Cloud Contract
● Spring Cloud Netflix
● Spring Cloud Gatewa...

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Spring Cloud developer at Pivotal
Working mostly on
● Spring Cloud Sleuth
● Spring Cloud Contract
● CI / CD
About us
Twi...

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Introduction
Demo
Summary
Agenda

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What we will NOT be talking about?

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● Schema
● WSDL
● ESB
● XSD
● XSLT
What we will NOT be talking about?
THE IDEA OF SPRING
CLOUD CONTRACT IS
NOT TO INTROD...

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● Producer
○ service that exposes an API / sends a message
● Consumer
○ service that consumes the API of the producer / ...

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● Stub validity & reusability in the integration tests
● Nice API creation
Introduction
What problems are we trying to s...

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Introduction
Typical situation
HTTP
CONSUMER PRODUCER

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Introduction
How to write a test for it?
HTTP
CONSUMER PRODUCER

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Introduction
How to write a test for it?
HTTP
CONSUMER PRODUCER

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WireMock
http://wiremock.org/

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Introduction
A typical scenario
WE’RE ON THE CONSUMER SIDE!!
CONSUMER OWNS THE STUB
DEFINITIONS

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Introduction
Stub validity & reusability

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Introduction
Let’s assume that we’re
introducing a new endpoint...
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Introduction
New endpoint
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● I write the missing code to work with the new URL
● The unit and integration tests pass
● Now we deploy to an environ...

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Introduction
Ooops...

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Stubs that were used in the build phase have nothing to do with the real API!!
Introduction
What went wrong?
HTTP
CONSU...

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Stubs that were used in the build phase have nothing to do with the real communication!!
Introduction
Another example w...

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● Stubs reside with the consumer
● Consumer controls the stubbing process
● How are you sure that the stubs are valid?
...

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● It’s the consumer that uses the API
● Consumers should take part in the creation of the API of the
producer
● The pro...

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Introduction
Nice API creation - no cooperation results

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Introduction
Nice API creation - no cooperation results

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Demo
Potential answer
Spring Cloud Contract

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● Consumer
○ service that gets beer requests
○ has to ask another service if the client can get the beer
● Producer
○ s...

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Introduction
What are we going to code?
I’m 22 give me a beer
CONSUMER PRODUCER
THERE YOU GO
Can the beer be sold?
stat...

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Introduction
What are we going to code?
I’m 17 give me a beer
CONSUMER PRODUCER
GET LOST
Can the beer be sold?
status: ...

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Demo
Who is who?
WHITE TERMINAL
WHITE IDE
CONSUMER
BLACK TERMINAL
BLACK IDE
PRODUCER

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Demo
Consumer’s
offline work
Consumer Phase 1 Consumer Phase 2
Consumer’s
switching to online
Producer phase
Producer’s...

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Demo
PRODUCER
CONSUMER
CLONES
PRODUCER
PRODUCER
CLONE
Consumer flow 1
CONSUMER

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Demo
PRODUCER CONSUMER
CONSUMER
CLONES
PRODUCER
PRODUCER
CLONE
INTERACTION
Consumer flow 1

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Demo
PRODUCER CONSUMER
PRODUCER
CLONE
INTERACTION
CONSUMER FILES
A PR
Consumer flow 1

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Demo

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Demo
PRODUCER
TAKES OVER
THE PR
Producer flow

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Demo
PRODUCER
TAKES OVER
THE PR
Producer flow
WRITES THE
MISSING
IMPLEMENTATIO
N

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Demo
PRODUCER
TAKES OVER
THE PR
Producer flow
WRITES THE
MISSING
IMPLEMENTATIO
N
MERGES TO MASTER
CI UPLOADS TO NEXUS /...

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Demo

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Demo
CONSUMER
Consumer flow 2
SWITCHES
TO ONLINE
MODE
DOWNLOADS STUBS
OF COLLABORATORS
DURING BUILD PHASE

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Demo

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I don’t want to write any scripts!

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Spring Cloud Contract with YML
Don’t worry! You can use
Spring Cloud Contract with YML
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Spring Cloud Contract with YML
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Spring Cloud Contract with Swagger
If you must… then you can also use
Swagger definitions
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Spring Cloud Contract with Rest Docs
You can also use
Spring Cloud Contract with Rest Docs!!
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With Spring Cloud Contract and Consumer Driven Contracts:
● we’ve created an API that suits the consumer and the produc...

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Learn More. Stay Connected.
▪ Read the docs
http://cloud.spring.io/spring-cloud-contract/
▪ Check the samples
https://g...

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QUESTIONS

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