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https://github.com/simbadltd/k6-expect
k6 library that simplifies writing tests in a functional way by providing a simple and readable syntax for expectations
https://github.com/simbadltd/k6-expect
Last synced: 3 months ago
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k6 library that simplifies writing tests in a functional way by providing a simple and readable syntax for expectations
- Host: GitHub
- URL: https://github.com/simbadltd/k6-expect
- Owner: simbadltd
- License: mit
- Created: 2022-01-30T10:03:40.000Z (almost 3 years ago)
- Default Branch: main
- Last Pushed: 2023-04-06T06:10:21.000Z (over 1 year ago)
- Last Synced: 2024-03-25T16:43:48.561Z (8 months ago)
- Language: TypeScript
- Size: 254 KB
- Stars: 2
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-k6 - k6-expect - k6 library that simplifies writing tests in a functional way by providing a jest-like syntax for expectations. (Tools)
README
# k6-expect
[](https://www.npmjs.org/package/k6-expect)
[](https://github.com/simbadltd/k6-expect/actions/workflows/main.yml)
k6 library that simplifies writing tests in functional way by providing a simple and [jest](https://jestjs.io/)-like syntax for expectations.
## Usage
### Get started
``` typescript
export default function () {
describe("Check", t => {
const r = http.get("https://jsonplaceholder.typicode.com/users/10");
// specialized and type-safe assertions
// ... for k6 http response
t.expect(response(r, x => x.ok(), x => x.validJson()))
// ... for primitives
.and("Id", num(r.json("id"), x => x.toEqual(10)))
.and("Name", str(r.json("name"), x => x.not().toBeEmpty()))
.and("Phone number", str(r.json("phone"), x => x.regex("\\d{3}-\\d{3}-\\d{4}")))
.and("Geolocation", num(r.json("address.geo.lat"), x => x.lessThan(0)))
.and("Company", str(r.json("company.name"), x => x.toContain("LLC")));
});
}
```
Output:
```console
█ User check
✓ https://jsonplaceholder.typicode.com/users/10 is 200
✓ https://jsonplaceholder.typicode.com/users/10 responded with valid json
✓ Id is 10
✓ Name is not empty
✓ Phone number matches '\d{3}-\d{3}-\d{4}' pattern
✓ Geolocation is less than 0
✓ Company contains 'LLC'
```
For more information, check this [examples](examples).
### Pass custom context
``` typescript
export class FooContext implements TestSuiteContext {
breakOnFirstAssert: boolean;
constructor() {
this.breakOnFirstAssert = true;
}
sanitizeUrl(url: string): string {
return "";
}
customFunction() { /* custom logic */ }
}
let fooContext = new FooContext();
export default function () {
describe("Check", t => {
// Test logic
// ...
// Access to custom logic
t.context!.customFunction();
}, fooContext);
}
```
### Typescript integration
Based on [k6-template-typescript](https://github.com/grafana/k6-template-typescript).
`package.json`:
```json
{
"devDependencies": {
"k6-expect": "X.X.X"
}
}
```
`webpack.config.js`:
```javascript
// ...
module.exports = {
// ...
externals: [
function ({context, request}, c) {
if (request.startsWith('k6') || request.startsWith('https://')) {
return request === 'k6-expect' ? c() : c(null, 'commonjs ' + request);
}
return c();
},
],
// ...
}
```
## Assertions table
| Access Function | Assertion | Supports negation | Description |
|-----------------|--------------------|-------------------|-----------------------------------------------------|
| that() | nil | ✓ | Check value for `null` or `undefined` |
| | null | ✓ | Check value for `null` |
| | toEqual | ✓ | Check value for equality |
| bool() | toBeTruthy | ✗ | Check value for truth |
| | toBeFalsy | ✗ | Check value for falsity |
| collection() | toBeEmpty | ✓ | Check array for emptiness |
| | length | ✓ | Check array for length |
| | toContain | ✓ | Check array for occurence of an item |
| num() | zero | ✓ | Check value for zero |
| | between | ✓ | Check value for a hit in the interval (inclusive) |
| | greaterThan | ✓ | Check that value is greater |
| | greaterThanOrEqual | ✓ | Check that value is greater or equal |
| | lessThan | ✓ | Check that value is less |
| | lessThanOrEqual | ✓ | Check that value is less or equal |
| str() | toBeEmpty | ✓ | Check value for emptiness |
| | regex | ✓ | Check that value matches the pattern |
| | toContain | ✓ | Check value for occurence of a string |
| response() | validJson | ✓ | Check that response contains valid json |
| | success | ✓ | Check that response has successful status (200-299) |
| | status | ✓ | Check that response has status specified |
| | ok | ✓ | Check response for `200 OK` |
| | accepted | ✓ | Check response for `202 ACCEPTED` |
| | noContent | ✓ | Check response for `204 NO CONTENT` |
| | badRequest | ✓ | Check response for `400 BAD REQUEST` |
| | unauthorized | ✓ | Check response for `401 UNAUTHORIZED` |
| | forbidden | ✓ | Check response for `403 FORBIDDEN` |
| | notFound | ✓ | Check response for `404 NOT FOUND` |
| | length | ✓ | Check response body length |
## LICENSE
Distributed under the MIT License. See [LICENSE](LICENSE) for more information.