highland-process/test/from.js

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

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

describe('from', function() {
  it('works', function(done) {
    var echo = spawn('echo', ['hello how are you?']);

    from(echo)
    .split()
    .pull(function(error, value) {
      assert.isNull(error);
      // we get back a buffer
      assert.equal(value.toString('utf8'), 'hello how are you?');
      done();
    });
  });

  it('passes errors', function(done) {
    var ls = spawn('ls', ['nonexistent']),
        errorCalled = 0;

    from(ls)
    .errors(function(error, push) {
      errorCalled++;
      assert.match(error.message, /No such file or directory/);
    })
    .apply(function() {
      assert.equal(errorCalled, 1);
      done();
    });
  });

  it('splits errors by newline', function(done) {
    var errors = exec('>&2 printf "error\\nerror2"');
        errorCalled = 0;

    from(errors)
    .errors(function(error, push) {
      errorCalled++;
      if (errorCalled === 1) {
        assert.equal(error.message, 'error');
      } else {
        assert.equal(error.message, 'error2');
      }
    })
    .apply(function() {
      assert.equal(errorCalled, 2);
      done();
    });
  });
});