test-mixer/README.md

Test helper to generate function opts object variations

<h1 align="center">test-mixer</h1>

<p align="center">Test helper to generate function opts object variations</p>

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## Install

This package is [pure ESM](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c). If you're not ready yet, install an older version of this program, 2.1.0 (`npm i test-mixer@2.1.0`).

```bash
npm i test-mixer
```

## Quick Take

```js
import { strict as assert } from "assert";

import { mixer } from "test-mixer";

// check all possible combinations of all boolean opts:
const defaultOpts = {
  scrapeWindshield: true,
  checkOil: true,
  inflateTires: false,
  extinguishersCount: 1, // as non-boolean will be ignored
};

// generates 2^3 = 8 combinations all possible bools
assert.deepEqual(
  mixer(
    {
      // empty first arg object means you want all combinations
    },
    defaultOpts,
  ),
  [
    {
      scrapeWindshield: false,
      checkOil: false,
      inflateTires: false,
      extinguishersCount: 1,
    },
    {
      scrapeWindshield: true,
      checkOil: false,
      inflateTires: false,
      extinguishersCount: 1,
    },
    {
      scrapeWindshield: false,
      checkOil: true,
      inflateTires: false,
      extinguishersCount: 1,
    },
    {
      scrapeWindshield: true,
      checkOil: true,
      inflateTires: false,
      extinguishersCount: 1,
    },
    {
      scrapeWindshield: false,
      checkOil: false,
      inflateTires: true,
      extinguishersCount: 1,
    },
    {
      scrapeWindshield: true,
      checkOil: false,
      inflateTires: true,
      extinguishersCount: 1,
    },
    {
      scrapeWindshield: false,
      checkOil: true,
      inflateTires: true,
      extinguishersCount: 1,
    },
    {
      scrapeWindshield: true,
      checkOil: true,
      inflateTires: true,
      extinguishersCount: 1,
    },
  ],
);

// let's "pin" a value, prepare two sets of options objects,
// one where scrapeWindshield === true and another with "false"

// you'll get 2 ^ (3-1) = 4 variations:
const variationsWithScrapeWindshieldOn = mixer(
  {
    scrapeWindshield: true,
  },
  defaultOpts,
);
assert.deepEqual(variationsWithScrapeWindshieldOn, [
  {
    scrapeWindshield: true, // <--- pinned
    checkOil: false,
    inflateTires: false,
    extinguishersCount: 1,
  },
  {
    scrapeWindshield: true, // <--- pinned
    checkOil: true,
    inflateTires: false,
    extinguishersCount: 1,
  },
  {
    scrapeWindshield: true, // <--- pinned
    checkOil: false,
    inflateTires: true,
    extinguishersCount: 1,
  },
  {
    scrapeWindshield: true, // <--- pinned
    checkOil: true,
    inflateTires: true,
    extinguishersCount: 1,
  },
]);

// also 4 variations, similar but with scrapeWindshield === false pinned:
const variationsWithScrapeWindshieldOff = mixer(
  {
    scrapeWindshield: false,
  },
  defaultOpts,
);
assert.equal(variationsWithScrapeWindshieldOff.length, 4);
```

## Documentation

Please [visit codsen.com](https://codsen.com/os/test-mixer/) for a full description of the API.

## Contributing

To report bugs or request features or assistance, [raise an issue](https://github.com/codsen/codsen/issues/new/choose) on GitHub.

## Licence

MIT License.

Copyright © 2010-2025 Roy Revelt and other contributors.

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