stream-mock

Stream Mock

Mock nodejs streams.

Features

• Create a readable stream from any iterable.
• Create a writable stream that puts its data at your disposal.
• Can operate both in object and normal ( Buffer ) mode.

Quick start

yarn add --dev stream-mock

Or, if you are more a npm person

npm -i -D stream-mock

Basic usage

You are building an awesome brand new Transform stream that rounds all your values.

import { Transform } from 'stream';

export default class Rounder extends Transform {
  _transform(chunk, encoding, callback) {
    this.push(Math.round(chunk));
    callback();
  }
}

Now you need / want to test it.

import {ReadableMock, WritableMock } from 'stream-mock';
import chai from 'chai';

import Rounder from 'the/seven/bloody/hells';

chai.should();

describe('Test me if you can', (done) => {
    it('Round me like one of your french girls', {
        // Given
        const input = [1.2, 2.6, 3.7];
        const reader = new ReadableMock(input, {objectMode: true});
        const writer = new WritableMock({objectMode: true});
        const transform = new Rounder({objectMode: true});
        // When
        reader.pipe(transform).pipe(writer);
        // Then
        writer.on('finish', ()=>{
            writer.data.should.deep.equal(input.map(Math.round));
        })
    });
});

API documentation

Full API doc is hosted here

Contributing

stream-mock is currently on early stage. I'm happily receiving new PR or discussing about new features, improvement or bug report. If you need something that this module is lacking (related to Nodejs stream mock obviously), do not hesitate to raise an issue.

Developper side

If you have to write code in that repository, please be kind to run unit tests and lint before pushing. Yeah the linter is quite strict, but it's for the best !

yarn run test
yarn run lint

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License

MIT