highland-process/test/through.js

Utility that lets you turn a process into a highland stream.

var _ = require('highland'),
    assert = require('chai').assert,
    spawn = require('child_process').spawn,
    through = require('../index').through;

describe('through', function() {
  it('works', function(done) {
    var tee = spawn('tee');

    _(['hello how are you?'])
    .through(through(tee))
    .pull(function(error, value) {
      assert.isNull(error);
      // we get back a buffer
      assert.equal(value.toString('utf8'), 'hello how are you?');
      done();
    });
  });

  it('passes through errors', function(done) {
    var isErrorPassed = false,
        stream = _(function(push, next) {
          push(null, 'hello');
          push(new Error('find me!'));
          push(null, ' bye');
          push(null, _.nil);
        }),
        tee = spawn('tee');

    stream
      .through(through(tee))
      .errors(function(error, push) {
        isErrorPassed = error.message === 'find me!';
      })
      .toArray(function(results) {
        assert.equal(results[0].toString('utf8'), 'hello bye');
        assert.isTrue(isErrorPassed);
        done();
      });
  });
});