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Python Microservices Development

You're reading from   Python Microservices Development Build, test, deploy, and scale microservices in Python

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Product type Paperback
Published in Jul 2017
Publisher Packt
ISBN-13 9781785881114
Length 340 pages
Edition 1st Edition
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Table of Contents (20) Chapters Close

Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Introduction
1. Understanding Microservices FREE CHAPTER 2. Discovering Flask 3. Coding, Testing, and Documenting - the Virtuous Cycle 4. Designing Runnerly 5. Interacting with Other Services 6. Monitoring Your Services 7. Securing Your Services 8. Bringing It All Together 9. Packaging and Running Runnerly 10. Containerized Services 11. Deploying on AWS 12. What Next?

Testing


As we learned in Chapter 3, ;Coding, Testing and Documenting - the Virtuous Cycle, the biggest challenge when writing functional tests for a service that calls other services is to isolate all network calls.

In this section, we'll see how we can mock synchronous calls made with Requests, and asynchronous calls for Celery workers and other asynchronous processes.

Mocking synchronous calls

If you are using Requests to perform all the calls--or you are using a library that is based on Requests and that does not customize it too much, this isolation work is easier to do, thanks to the transport adapters we saw earlier in this chapter.

The requests-mock project (https://requests-mock.readthedocs.io) implements an adapter that will let you mock network calls in your tests.

Earlier in this chapter, we saw an example of a Flask app that was an HTTP endpoint to serve some content on its /api endpoint.

That application used a Request session that was created by a setup_connector() function and retrieved...

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