The Ultimate Guide to Testing with Prisma: Unit Testing
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A practical guide to unit testing in a Node.js/TypeScript Express API that uses Prisma Client. Covers what unit testing is, which files need tests and which don't (including why Prisma Client itself shouldn't be tested), how to set up Vitest with vitest-mock-extended, and how to mock external modules like Prisma and randomColor. Walks through writing a full suite of unit tests for a tags service, covering scenarios like upsert deduplication, random color assignment, and empty input handling.
Table of contents
Table Of ContentsIntroductionPrerequisitesExplore the APISet up VitestFiles that don't need to be testedWhat you will testTest the tags serviceSummary & What's next1 Impression