Contract Testing of Web Sockets: Functional Programming is taking the Stage

Oct 24, 20180 likes281 views

My talk from NordicAPIs 2018: https://nordicapis.com/sessions/contract-testing-of-websockets-functional-programming-is-taking-the-stage/

Contract Testing of WebSockets:
Functional Programming is taking the Stage
Artem Demchenkov
Illustration © Caterina Carraro/Billie

2
Artem Demchenkov
● CTO & Co-Founder at Billie
● ardemchenkov@gmail.com
● https://www.linkedin.com/in/artem-demchenkov-76b69934/

Billie
We are an innovative financial platform, focused on working capital financing.
Some numbers:
● Start: 01.12.2016
● Closed Beta: 01.05.2017
● Public Launch: 01.06.2017
● Team: 36
● Engineering Crew: 18

Frontend/Backend communication process at Billie
4
Frontend BackendPush Server
1.WebSocket Connection
5. WebSocket Push 4. API Endpoint Push
3. Change2. WebSocket Authorization

Testing at Billie
5
● Unit Testing (PHPUnit)
● Functional Testing (Behat, PHPUnit)
● End-to-End Testing (Selenium, Java)
● API Testing (Postman Collections)
● Contract Testing (Pact.io)
● Load Testing (JMeter, Gatling)
● Penetration Testing (OWASP, External audit)
● Chaos Engineering / Monkey Testing

Pact Contract Testing
6
Consumer ProviderMock Server
1. Actual Request
2. Expected Response 4. Actual Response
3. Expected Request

7
Contract Testing
is a perfect way
to test
WebSocket Communication

What makes it possible
8
● Backend is a Provider of data
● Frontend is a Consumer of data
● Push Server is a unit, responsible for communication. Same as Mock Server
● FE/BE Pact is a collection of two Interactions
○ WS Connection/Authorization
○ Backend - Frontend Push

What else makes it possible. Erlang Worldview *
9
● Everything is a process
● Processes have unique names
● If you know the name of a process you can send it a message
● Processes do what they are supposed to do or fail
* as Joe Armstrong, co-inventor of Erlang, summarized in his PhD thesis

Contract Testing of WebSockets
10
Consumer (Process) Test (Process)Push Server (Process)
3. Interaction 1
5. Interaction 2
1. Start
2. Start
4. Verification 1
6. Verification 2

What if not «Everything is a process»? E.g. PHP
12
Consumer (Object) Test (Process)Push Server (Process)
3. Interaction 1
5. Interaction 2
1. Start
2. Create
4. Verification 1
6. Verification 2

Thank you
● ardemchenkov@gmail.com
● https://www.linkedin.com/in/artem-demchenkov-76b69934/

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Contract Testing of Web Sockets: Functional Programming is taking the Stage

1. Contract Testing of WebSockets: Functional Programming is taking the Stage Artem Demchenkov Illustration © Caterina Carraro/Billie

2. 2 Artem Demchenkov ● CTO & Co-Founder at Billie ● ardemchenkov@gmail.com ● https://www.linkedin.com/in/artem-demchenkov-76b69934/

3. Billie We are an innovative financial platform, focused on working capital financing. Some numbers: ● Start: 01.12.2016 ● Closed Beta: 01.05.2017 ● Public Launch: 01.06.2017 ● Team: 36 ● Engineering Crew: 18

4. Frontend/Backend communication process at Billie 4 Frontend BackendPush Server 1.WebSocket Connection 5. WebSocket Push 4. API Endpoint Push 3. Change2. WebSocket Authorization

5. Testing at Billie 5 ● Unit Testing (PHPUnit) ● Functional Testing (Behat, PHPUnit) ● End-to-End Testing (Selenium, Java) ● API Testing (Postman Collections) ● Contract Testing (Pact.io) ● Load Testing (JMeter, Gatling) ● Penetration Testing (OWASP, External audit) ● Chaos Engineering / Monkey Testing

6. Pact Contract Testing 6 Consumer ProviderMock Server 1. Actual Request 2. Expected Response 4. Actual Response 3. Expected Request

7. 7 Contract Testing is a perfect way to test WebSocket Communication

8. What makes it possible 8 ● Backend is a Provider of data ● Frontend is a Consumer of data ● Push Server is a unit, responsible for communication. Same as Mock Server ● FE/BE Pact is a collection of two Interactions ○ WS Connection/Authorization ○ Backend - Frontend Push

9. What else makes it possible. Erlang Worldview * 9 ● Everything is a process ● Processes have unique names ● If you know the name of a process you can send it a message ● Processes do what they are supposed to do or fail * as Joe Armstrong, co-inventor of Erlang, summarized in his PhD thesis

10. Contract Testing of WebSockets 10 Consumer (Process) Test (Process)Push Server (Process) 3. Interaction 1 5. Interaction 2 1. Start 2. Start 4. Verification 1 6. Verification 2

11. 11 Demo

12. What if not «Everything is a process»? E.g. PHP 12 Consumer (Object) Test (Process)Push Server (Process) 3. Interaction 1 5. Interaction 2 1. Start 2. Create 4. Verification 1 6. Verification 2

13. Thank you ● ardemchenkov@gmail.com ● https://www.linkedin.com/in/artem-demchenkov-76b69934/

14. Check it out. There’s interesting More in our “Engineering Corner” on Medium 14 https://medium.com/billie-finanzratgeber

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