Supercharge your Tests with Factories

This talk will explore the factory pattern and how to leverage it to greatly improve your automated tests. By leaning on Prisma's ORM features and TypeScript types, you'll be able to quickly and painlessly create the exact data your tests need.

Sound interesting? Join our discussion at https://github.com/echobind/prisma-factory!

Transcript

1. With Factories Supercharge your Tests Chris Ball @cball_
2. Part 1: Request Tests (Integration Tests) Part 2: Resetting the Database & Creating Data Part 3: The Factory Pattern & Prisma Part 4: E2E Tests Part 5: Tips & Tricks Tests ❤ Factories, Factories ❤ Supercharge your tests with Factories Prisma Day 2021 by Chris Ball 02
3. 03 Unit Tests Please write them. We're focusing higher today. Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
4. 03 Request Tests API Layer. aka Integration Tests. Request ➡ Your Code ➡ Database ➡ Your Code ➡ Response Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
5. 03 Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
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8. 03 Supercharge your tests with Factories Prisma Day 2021 by Chris Ball Inline Snapshots are great! (if used properly)
9. 03 Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
10. 03 Creating Valid Data In Request Tests Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
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14. 06 And nothing more. Create the data you need for that test Check errors, edge cases, proper responses Make a request (as a user or a guest) and assert the response Before each test, make sure the database is reset. Start each test with a clean slate. Reset the database Biggest bang-for-buck at API layer Use to test all permissions and edge cases! Request Tests Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
15. 03 The Factory Pattern Make it easier to create valid data. Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
16. 03 Factories? A simple object maker. Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
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24. 03 Why Factories? Less brittle tests. Update in a single place! Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
25. 06 This reduces the amount of code you need to write. Add a new required attribute? Just update the factory. Add defaults for required attributes This lets you use the patterns we just discussed. Use Prisma types for type safety! Add an object that exports build and create functions ex: Chance.js. Comes in handy with E2E tests. Long or unexpected names can break layout. Avoids false confidence from copy/pasta! Use a faker library for random values Make your life easier when creating data for your tests. Factories Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
26. 03 E2E Tests Frontend Layer. Runner ➡ Browser ➡ Your Code ➡ API call ➡ Your Code ➡ Browser Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
27. 03 Factories in E2E Example using Cypress. Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
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30. 03 Tips & Tricks Just a few, don't worry. Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
31. Don't put relationships in your factory functions. Randomize your eunms Leverage fake data to find edge cases You create additional records you may not need. Same as above Always using known quanities can create bugs Pass in all relationships via Prisma's connect / create methods. chance.pickone(Object.values(MyEnum)) Use the great functions provided by chance (or your chosen fake library). 07 Tips & Tricks for Factories in Prisma Tip Why? How? Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
32. 03 Supercharge your tests with Factories Prisma Day 2021 by Chris Ball Tests ❤ Factories, Factories ❤
33. 12 Interested? Want to help with this? Supercharge your tests with Factories Prisma Day 2021 by Chris Ball Discussion at: https://github.com/echobind/prisma-factory
34. These patterns and more. Echobind's Default Web Template. https://github.com/echobind/bisonapp 12 Supercharge your tests with Factories Prisma Day 2021 by Chris Ball
35. @cball_ 11 Thanks! Supercharge your tests with Factories Prisma Day 2021 by Chris Ball