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API Mocking Best Practices
Archana Patel
APIDays Live Hong Kong 2021
Archana Patel
Customer Success Architect
MuleSoft
archana.patel@mulesoft.com
linkedin.com/in/archana-patel/
Agenda
● What is API mocking?
● Why use API mocking
● Types of mocks
● Mocking Tools
● Do’s and Don’ts
What is API mocking?
API client API
Mocks
API(s)
Backend
systems
Data
stores
Why use API mocking
Why use API mocking
Decoupled
development
Design-first approach Rapid feedback
Why use API mocking
Isolated scenario
testing
Unstable systems
Integration testing
Why use API mocking
External dependencies 3rd party API costs
Types of mocks
Types of mocks
1. Static mocks
API client API
Mocks
API(s)
Backend
systems
Data
stores
Types of mocks
2. Record/replay
API client API
Mock server
API(s)
Backend
systems
Data
stores
Types of mocks
2. Record/replay
API client API
Mock server
API(s)
Backend
systems
Data
stores
Mocking tools
Mountebank
● Allows static mocks as well as
record/replay
● Provides flexibility in configuring
mock behaviours
● Easy setup
● Multi-protocol
MockServer
● Allows static mocks, record/replay
plus some other options
● Multiple ways to use (REST API /
Java / Javascript)
● Easy setup
● UI for debugging
Other Mocking Tools
Killgrave
mockable.io
Online
Local
Embedded
Do’s and Don’ts - API Mocking
Best practices
Mocks need to match the specification
Negative tests are good!
Mocks go stale!!
Flexibility-Usability Tradeoff
Source https://www.bulkrenameutility.co.uk/Shots/BRU_Main_Screen.gif
The 80/20 Rule
Source: https://www.salesforce.com/ca/blog/2016/09/80-20-rule.html
To sum it up...
● Make sure the mocks are accurately matching to the API specification
● Make sure your mocks are current and regularly updated
● Use record/replay if you can
● Don’t over-engineer it
● Find a balance between what to mock and what not to mock
● Don’t forget to test for negative test cases / error handling
Thank You!
archana.patel@mulesoft.com
linkedin.com/in/archana-patel/

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apidays LIVE Hong Kong 2021 - API Mocking best practices by Archana Patel, Mulesoft

Notas do Editor

  1. A little bit more about myself - I am Customer Success Architect at MuleSoft, It’s a lengthy title but what it means is that I help customers get the most out of the MuleSoft products for their integration needs. I am based in Wellington NZ and mostly work with customers and partners in the APAC region. Before joining MuleSoft, I have worked as an Integration developer for various companies in NZ, designing and developing APIs in banking, airline etc
  2. Now you all have been through a long day of API talks and I’m hugely aware of the fact that I’m standing between you and a much-needed break so I’ve kept the agenda simple and easy on information.