The document discusses consumer-driven contracts, emphasizing their role in defining communication between consumers and servers in software development. It highlights the benefits and examples of implementing these contracts using technologies like WireMock and AccuRest. Additionally, it provides code snippets and resources for building and testing consumer-driven contracts.

1. Stick to the rules!
Consumer Driven Contracts
Marcin Grzejszczak @mgrzejszczak
Jakub Kubrynski @jkubrynski

2. Jakub
Kubryński
@jkubrynski
www.kubrynski.com
Marcin
Grzejszczak
@mgrzejszczak
toomuchcoding.blogspot.com

3. TDD on architectural level
@mgrzejszczak @jkubrynski

4. What is
Consumer Driven Contract
@mgrzejszczak @jkubrynski
● Server
● Consumer
● Contract

5. Consumer Driven Contract
benefits
@mgrzejszczak @jkubrynski

6. Example
@mgrzejszczak @jkubrynski

7. Example
@mgrzejszczak @jkubrynski

8. How to solve it
@mgrzejszczak @jkubrynski
● Consumer’s tests
● Server tests

9. Contract definition
@mgrzejszczak @jkubrynski
● Contract defines communication
● Your stub is your contract - verify it!
● Expose your stub to your consumers

10. Consumer Technology
@mgrzejszczak @jkubrynski
Wiremock
http://wiremock.org
testCompile 'com.github.tomakehurst:wiremock:1.53'
{
"request": {
"method": "GET",
"url": "/hello"
},
"response": {
"status": 200,
"body": "Hello world!",
"headers": { "Content-Type": "text/plain" }
}
}

11. Server Technology
@mgrzejszczak @jkubrynski
Accurate REST
https://github.com/Codearte/accurest
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'io.codearte.accurest:accurest-gradle-plugin:0.5.0'
}
}
apply plugin: 'accurest'

12. Server Technology
@mgrzejszczak @jkubrynski
Accurate REST
def shouldMarkClientAsNotFraud() {
given:
def request = given()
.header('Content-Type', 'application/frud+json')
.body('{"clientPesel":"12345678901",
"loanAmount":123.123}')
when:
def response = given().spec(request)
.put("/fraudcheck")
then:
response.statusCode == 200
response.header('Content-Type') == 'application/fraud+json'
and:
def responseBody = parseText(response.body.asString())
responseBody.fraudCheckStatus == "OK"
}

13. Example
@mgrzejszczak @jkubrynski

14. Live coding
@mgrzejszczak @jkubrynski

15. Q&A
@mgrzejszczak @jkubrynski
github.com/marcingrzejszczak/4developers_cdc_examples