pipeline-js/test/test.js

Hassle free pipeline design pattern implementation

"use strict";

var assert = require('assert');
var Pipeline = require('../');
var helpers = require('./helper');

describe('pipeline', function () {

  // Helpers for normal testing
  var doubleSay = helpers.doubleSay,
    capitalize = helpers.capitalize,
    exclaim = helpers.exclaim;

  // Helpers for async testing
  var doubleSayAsync = helpers.doubleSayAsync,
    capitalizeAsync = helpers.capitalizeAsync,
    exclaimAsync = helpers.exclaimAsync;

  it('can process pipelines created using pipe', function (done) {

    var excited = new Pipeline();

    excited.pipe(doubleSay)
      .pipe(capitalize)
      .pipe(exclaim);

    assert.equal(excited.process('hello'), 'Hello, hello!');

    done();
  });

  it('can process pipelines passed using constructor', function (done) {

    var excited = new Pipeline([
      doubleSay,
      capitalize,
      exclaim
    ]);

    assert.equal(excited.process('hello'), 'Hello, hello!');

    done();
  });

  it('can reuse pipelines', function (done) {

    var excited = new Pipeline();

    excited.pipe(doubleSay)
      .pipe(capitalize)
      .pipe(exclaim);

    assert.equal(excited.process('hello'), 'Hello, hello!');
    assert.equal(excited.process('world'), 'World, world!');
    assert.equal(excited.process('it works'), 'It works, it works!');

    done();
  });

  it('can process any pipelines with all stages returning promises', function (done) {
    var excited = new Pipeline([
      doubleSayAsync,
      capitalizeAsync,
      exclaimAsync
    ]);

    excited.process('hello')
      .then(function (value) {
        assert.equal(value, 'Hello, hello!');
      })
      .catch(function (error) {
      });

    done();
  });


  it('can process any pipelines with some stages returning promises and some not', function (done) {
    var excited = new Pipeline([
      doubleSayAsync,
      capitalize,
      exclaim
    ]);

    excited.process('hello')
      .then(function (value) {
        assert.equal(value, 'Hello, hello!');
      })
      .catch(function (error) {
      });

    done();
  });

});