fast-check
ts-to-zod
fast-check | ts-to-zod | |
---|---|---|
21 | 4 | |
4,115 | 1,000 | |
- | - | |
9.8 | 8.0 | |
5 days ago | 9 days ago | |
TypeScript | TypeScript | |
MIT License | MIT License |
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fast-check
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The 5 principles of Unit Testing
Libraries like JSVerify or Fast-Check offer essential tools to facilitate property-based testing.
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How to Survive Your Project's First 100k Lines
Strong agree!
For JavaScript, I suggest folks check out fast-check [0] and this introduction to property-based testing that uses fast-check [1].
This is broadly useful, but one specific place I've found it helpful was to check redux reducers against generated lists of actions to find unchecked edge cases and data assumptions.
[0] https://github.com/dubzzz/fast-check
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Master property-based testing in JavaScript: A step-by-step tutorial
Brilliant, this is a massive improvement. Previously I was fumbling around in https://github.com/dubzzz/fast-check/tree/main/packages/fast-check/documentation for info.
- Bring the power of property based testing framework fast-check into Vitest
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[AskJS] Should I be generating random data for parameters when unit testing?
There's a library for exactly that: FastCheck.
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Integrate Jest and fast-check together
It makes @fast-check/jest, the best option to integrate Jest and fast-check, as it provides an abstraction over both to ease their mutual integration.
- I Created an API to Generate Mock Information
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Generating dummy entities with random data for tests based on types
The closest that I know of (and I have not used this) is zod-fast-check. It generates fast-check “arbitraries” (test data generators) for property-based testing based on zod schemas. Of course, this requires that you use zod to define your types, which has some downsides. Fortunately there is another tool, ts-to-zod, (which I also have not used) which will codegen zod schemas based on TS type definitions. If you thread these four libraries together you should end up with the ability to write random tests on generated data with very little overhead. In theory.
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Best practice where to test validation?
For something like this, I might break out fast-check for testing. It’s good at generating a wide range of values for a given type, and could help you get good test coverage without having to hand-author a lot of repetitive error inputs.
- Fast-check: How it works
ts-to-zod
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How to parse json into typescript types?
You could use something like this https://github.com/fabien0102/ts-to-zod
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Ultra-minimal JSON schemas with TypeScript inference
YES! I've introduced ts-to-zod into my codebase only yesterday, and it's served my needs exactly. It doesn't handle generics or mapped types, but that's a fair price to pay.
It also works the other way, you can define a zod schema and you can infer types for your data from it.
https://github.com/fabien0102/ts-to-zod
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Generating dummy entities with random data for tests based on types
The closest that I know of (and I have not used this) is zod-fast-check. It generates fast-check “arbitraries” (test data generators) for property-based testing based on zod schemas. Of course, this requires that you use zod to define your types, which has some downsides. Fortunately there is another tool, ts-to-zod, (which I also have not used) which will codegen zod schemas based on TS type definitions. If you thread these four libraries together you should end up with the ability to write random tests on generated data with very little overhead. In theory.
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Runtime Data Validation from TypeScript Interfaces
Okay, that's an improvement! We can use TypeScript's native type syntax to define the interface, and augment it with JSDoc comments for any properties that can't be natively expressed. So, to use this with Zod, we need to convert it from the TypeScript syntax to the Zod syntax. Luckily, Fabien Bernard has spearheaded the excellent ts-to-zod project, which looks through interfaces defined in a file and outputs the equivalent Zod schemata for them.
What are some alternatives?
Unexpected - Unexpected - the extensible BDD assertion toolkit
zod - TypeScript-first schema validation with static type inference
jest - Delightful JavaScript Testing.
ts-ast-viewer - TypeScript AST viewer.
tape - tap-producing test harness for node and browsers
ts-patch - Augment the TypeScript compiler to support extended functionality
trevor - 🚦 Your own mini Travis CI to run tests locally
spartan-schema - Ultra-minimal JSON schemas with Typescript inference
test-each - 🤖 Repeat tests. Repeat tests. Repeat tests.
intermock - Mocking library to create mock objects with fake data for TypeScript interfaces
nyc - the Istanbul command line interface
quicktype - Generate types and converters from JSON, Schema, and GraphQL