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jest-fast-check

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Property based testing for Jest based on fast-check

jest-fast-check 최신버젼 다운로드

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⚠️⚠️⚠️ Project moved to https://github.com/dubzzz/fast-check/tree/main/packages/jest ⚠️⚠️⚠️

---

# Property based testing for Jest based on [fast-check](https://github.com/dubzzz/fast-check/)

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Bring the power of property based testing framework fast-check into jest.
`jest-fast-check` simplifies the integration of fast-check into jest testing framework.

## Getting started

Install `jest-fast-check` and its peer dependencies:

```bash
# With yarn
yarn add -D jest fast-check jest-fast-check

# With npm
npm install --save-dev jest fast-check jest-fast-check
```

## Example

```javascript
import { testProp, fc } from "jest-fast-check";

// for all a, b, c strings
// b is a substring of a + b + c
testProp(
  "should detect the substring",
  [fc.string(), fc.string(), fc.string()],
  (a, b, c) => {
    return (a + b + c).includes(b);
  }
);
```

Please note that the properties accepted by `jest-fast-check` as input can either be synchronous or asynchronous (even just `PromiseLike` instances).

## Advanced

If you want to forward custom parameters to fast-check, `testProp` accepts an optional `fc.Parameters` ([more](https://github.com/dubzzz/fast-check/blob/main/documentation/1-Guides/Runners.md#runners)).

`jest-fast-check` also comes with `.only`, `.skip` and `.todo` from jest.

```javascript
import { itProp, testProp, fc } from "jest-fast-check";

testProp(
  "should replay the test for the seed 4242",
  [fc.nat(), fc.nat()],
  (a, b) => {
    return a + b === b + a;
  },
  { seed: 4242 }
);

testProp.skip("should be skipped", [fc.fullUnicodeString()], (text) => {
  return text.length === [...text].length;
});

describe("with it", () => {
  itProp("should run too", [fc.nat(), fc.nat()], (a, b) => {
    return a + b === b + a;
  });
});
```

## Minimal requirements

| jest-fast-check | jest | fast-check |
| --------------- | ------------------------------------ | -------------------- |
| ^2.0.0 | >=26.5.0(1)(2) | ^3.0.0 |
| ^1.0.0 | >=26.5.0(1)(2) | ^2.0.0(3) |

- (1) any version of `jest` should be great if you are using `commonjs`
- (2) in order to use `esm` build, you may need to enable experimental features of node, see [here](./test-bundle/esm/package.json)
- (3) `fast-check@^2.0.0` for hybrid module support: `commonjs` and `esm` together

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