event-transmitter/test/test.js

Transmit events over any stream pipeline.

var stream = require('stream');
var brake = require('brake');
var expect = require('chai').expect;

var PassThrough = stream.PassThrough || require('readable-stream').PassThrough;
var EventTransmitter = require('../main');


describe('EventTransmitter Tests', function() {
  it('Exported OK', function() {
    var et = new EventTransmitter();
    var etListener = new EventTransmitter.Listener();

    expect(typeof EventTransmitter).to.equal('function');
    expect(typeof EventTransmitter.Listener).to.equal('function');

    expect(typeof etListener).to.equal('object');
    expect(typeof et).to.equal('object');
    expect(typeof et.transmit).to.equal('function');
  });

  it('Transmit', function() {
    var et = new EventTransmitter();
    var passthroughA = new PassThrough();

    et.pipe(passthroughA);

    passthroughA.on('data', function(data) {
      expect('<da39a3ee5e>["header",' + JSON.stringify({
        name: 'streamA',
        metadata: [23, 33, 221, 222]
      }) + ']<da39a3ee5e>').to.equal(data.toString());
    });

    et.transmit('header', {
      name: 'streamA',
      metadata: [23, 33, 221, 222]
    });
  });

  it('Pipe In and Transmit', function(done) {
    var passthroughA = new PassThrough(); // dummy
    var passthroughB = new PassThrough(); // dummy
    var et = new EventTransmitter();
    var count = 0;

    passthroughA.pipe(et).pipe(passthroughB);

    passthroughB.on('data', function(data) {
      count++;
      if (count === 1) {
        expect('Testing 123...').to.equal(data.toString());
      }
      if (count === 2) {
        expect('<da39a3ee5e>["header",' + JSON.stringify({
          name: 'streamA',
          metadata: [23, 33, 221, 222]
        }) + ']<da39a3ee5e>').to.equal(data.toString());
      }
      if (count === 3) {
        expect('...Ending').to.equal(data.toString());
        done();
      }
    });

    passthroughA.write('Testing 123...');

    setTimeout(function() {
      et.transmit('header', {
        name: 'streamA',
        metadata: [23, 33, 221, 222]
      });

      passthroughA.end('...Ending');
    }, 200);
  });

  it('Transmit and Emit, single', function(done) {
    var et = new EventTransmitter();
    var etListener = new EventTransmitter.Listener();

    et.pipe(etListener);

    etListener.on('header', function(header) {
      expect(typeof header).to.equal('object');
      expect(header.name).to.equal('streamA');
      expect(header.metadata[0]).to.equal(23);
      expect(header.metadata[3]).to.equal(222);
    });

    etListener.on('footer', function(footer) {
      expect(typeof footer).to.equal('object');
      expect(footer.exit_code).to.equal(2);
      done();
    });

    et.transmit('header', {
      name: 'streamA',
      metadata: [23, 33, 221, 222]
    });

    et.transmit('footer', {
      exit_code: 2
    });
  });

  it('Arbitrary Number of Arguments', function(done) {
    var et = new EventTransmitter();
    var etListener = new EventTransmitter.Listener();

    et.pipe(etListener);

    etListener.on('eventer', function() {
      expect(typeof arguments[0]).to.equal('object');
      expect(typeof arguments[1]).to.equal('string');
      expect(typeof arguments[2]).to.equal('number');
      expect(arguments[0].name).to.equal('streamA');
      expect(arguments[0].metadata[0]).to.equal(23);
      expect(arguments[0].metadata[3]).to.equal(222);
      done();
    });

    et.transmit('eventer', {
      name: 'streamA',
      metadata: [23, 33, 221, 222]
    }, '76', 76);
  });

  it('Sanitation', function(done) {
    var passthroughA = new PassThrough(); // dummy
    var passthroughB = new PassThrough(); // dummy
    var passthroughC = new PassThrough(); // dummy
    var et = new EventTransmitter();
    var etListener = new EventTransmitter.Listener();
    var count = 0;

    passthroughA.pipe(et).pipe(passthroughB).pipe(etListener).pipe(passthroughC);

    passthroughC.on('data', function(data) {
      count++;
      if (count === 1) {
        expect(data.toString()).to.equal('Testing... 123');
      }
      if (count === 2) {
        expect(data.toString()).to.equal('Testing Embedded');
      }
      if (count === 3) {
        expect(data.toString()).to.equal('Code to be removed and sanitized');
      }
      if (count === 4) {
        expect(data.toString()).to.equal('...Ending');
        done();
      }
    });

    passthroughA.write('Testing... 123');

    et.transmit('eventer', {
      name: 'streamA',
      metadata: [23, 33, 221, 222]
    });

    passthroughA.write('Testing Embedded<da39a3ee5e>["footer",{"exit_code":2}]<da39a3ee5e>Code to be removed and sanitized');
    passthroughA.end('...Ending');
  });

  it('Braked', function(done) {
    var expected = 'Testing... 123Testing EmbeddedCode to be removed and sanitized...Ending';
    var passthroughA = new PassThrough(); // dummy
    var passthroughB = new PassThrough(); // dummy
    var passthroughC = new PassThrough(); // dummy
    var et = new EventTransmitter();
    var etListener = new EventTransmitter.Listener();
    var count = 0;

    passthroughA.pipe(et).pipe(passthroughB).pipe(brake(150)).pipe(etListener).pipe(passthroughC);

    etListener.on('eventer', function(header) {
      expect(header.name).to.equal('streamA');
      expect(typeof header.metadata).to.equal('object');
    });

    passthroughC.on('data', function(data) {
      expect(expected.substr(count, data.toString().length)).to.equal(data.toString());

      for (var i = 1; i < data.toString().length; i++) {
        expect(true).to.equal(true); // to match expected test count
      }

      // console.log(count, expected.substr(count, data.toString().length), data.toString());
      count += data.toString().length;
      if (count === expected.length) {
        done();
      }
    });

    passthroughA.write('Testing... 123');

    et.transmit('eventer', {
      name: 'streamA',
      metadata: [23, 33, 221, 222]
    });

    passthroughA.write('Testing Embedded<da39a3ee5e>["footer",{"exit_code":2}]<da39a3ee5e>Code to be removed and sanitized');
    passthroughA.end('...Ending');
  });
});