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https://github.com/dubzzz/ava-fast-check
Property based testing for AVA based on fast-check
https://github.com/dubzzz/ava-fast-check
ava generative-testing property-based-testing quickcheck unit-testing
Last synced: 2 months ago
JSON representation
Property based testing for AVA based on fast-check
- Host: GitHub
- URL: https://github.com/dubzzz/ava-fast-check
- Owner: dubzzz
- License: mit
- Archived: true
- Created: 2018-09-05T20:50:36.000Z (almost 6 years ago)
- Default Branch: main
- Last Pushed: 2022-06-23T23:52:21.000Z (about 2 years ago)
- Last Synced: 2024-03-02T14:36:20.201Z (4 months ago)
- Topics: ava, generative-testing, property-based-testing, quickcheck, unit-testing
- Language: JavaScript
- Homepage:
- Size: 259 KB
- Stars: 44
- Watchers: 3
- Forks: 4
- Open Issues: 6
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Funding: .github/FUNDING.yml
- License: LICENSE
Lists
- awesome-ava - ava-fast-check - Property based testing. (Packages)
- awesome-fast-check - ava-fast-check - Property based testing for AVA based on fast-check (Packages)
- awesome-stars - dubzzz/ava-fast-check - Property based testing for AVA based on fast-check (JavaScript)
- awesome-stars - ava-fast-check - check | dubzzz | 33 | (TypeScript)
README
⚠️⚠️⚠️ Project moved to https://github.com/dubzzz/fast-check/tree/main/packages/ava ⚠️⚠️⚠️
---
# Property based testing for AVA based on [fast-check](https://github.com/dubzzz/fast-check/)
[](https://github.com/dubzzz/ava-fast-check/actions)
[](https://badge.fury.io/js/ava-fast-check)
Bring the power of property based testing framework fast-check into AVA.
`ava-fast-check` simplifies the integration of fast-check into AVA testing framework.
## Getting Started
Install `ava-fast-check` and its peer dependencies:
```bash
npm install --save-dev ava fast-check ava-fast-check
```
## Example
```typescript
import { testProp, fc } from 'ava-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()], (t, a, b, c) => {
t.true((a + b + c).includes(b));
});
```
The property is passed [AVA's `t` argument](https://github.com/avajs/ava/blob/main/docs/02-execution-context.md#execution-context-t-argument) for its first parameter, and the value of each arbitrary for the current test case for the rest of the parameters.
`ava-fast-check` supports all of [AVA's assertions](https://github.com/avajs/ava/blob/main/docs/03-assertions.md#assertions) and like AVA, supports synchronous and asynchronous functions, including promises, observables, and callbacks. See [AVA's documentation](https://github.com/avajs/ava/blob/main/docs/01-writing-tests.md#declaring-test) for more information.
## Advanced
### `fast-check` Parameters
`testProp` accepts an optional `fc.Parameters` for forwarding custom parameters to `fast-check` ([more](https://github.com/dubzzz/fast-check/blob/main/documentation/Runners.md#runners)).
### AVA Modifiers
`ava-fast-check` also comes with [`.only`], [`.serial`] [`.skip`], and [`.failing`] modifiers from AVA.
```typescript
import { testProp, fc } from 'ava-fast-check';
testProp('should replay the test for the seed 4242', [fc.nat(), fc.nat()], (t, a, b) => {
t.is(a + b, b + a);
}, { seed: 4242 });
testProp.skip('should be skipped', [fc.fullUnicodeString()], (t, text) => {
t.is([...text].length, text.length);
});
```
[`.only`]: https://github.com/avajs/ava/blob/main/docs/01-writing-tests.md#running-specific-tests
[`.serial`]: https://github.com/avajs/ava/blob/main/docs/01-writing-tests.md#running-tests-serially
[`.skip`]: https://github.com/avajs/ava/blob/main/docs/01-writing-tests.md#skipping-tests
[`.failing`]: https://github.com/avajs/ava/blob/main/docs/01-writing-tests.md#failing-tests
### AVA `before`/`after` Hooks
`ava-fast-check` exposes AVA's `before`/`after` [hooks]:
```typescript
import { testProp, fc } from 'ava-fast-check';
testProp.before(t => {
connectToDatabase();
});
testProp(
// ... omitted for brevity
);
testProp.after(t => {
closeDatabaseConnection();
});
```
[hooks]: https://github.com/avajs/ava/blob/main/docs/01-writing-tests.md#before--after-hooks
### AVA Execution Context
`ava-fast-check` mirror's AVA's procedure for customizing the test [execution context]:
```typescript
import { fc, testProp as anyTestProp, PropertyTestInterface } from '../src/ava-fast-check';
type TestContext = {
state: string
};
const testProp = anyTestProp as PropertyTestInterface;
testProp(
'should reach terminal state',
[fc.string()],
(t, received) => {
// here t is typed as ExecutionContext
console.log(t.context.state); // logs 'uninitialized'
// ... omitted for brevity
}
);
```
[execution context]: https://github.com/avajs/ava/blob/main/docs/02-execution-context.md
## Minimal requirements
| ava-fast-check | AVA | fast-check |
|----------------|-----------------------|-------------------------|
| ^6.0.0 | >=4.0.0 | ^3.0.0 |
| ^5.0.0 | >=4.0.0 | ^2.0.0(2)(4) |
| ^4.0.0 | >=3.9.0(1) | ^2.0.0(2) |
| ^3.0.0 | >=3.9.0(1) | ^2.0.0(2) |
| ^2.0.0 | >=3.9.0(1) | ^1.0.0 |
| ^1.0.0 | >=0.1.0(3) | ^1.0.0 |
- (1) `ava@>=3.9.0` for [`t.try`](https://github.com/avajs/ava/blob/main/docs/03-assertions.md#trytitle-implementation--macro--macro-args) support
- (2) `fast-check@^2.0.0` for hybrid module support: `commonjs` and `esm` together
- (3) `ava@>=0.1.0` for its Promise support
- (4) Already compatible with `fast-check@^3.0.0` but bump to `6.0.0` for updated peer version