control-flow/test/flow.js

Turns asynchronous function into synchronous

var flow   = require('../flow')
var expect = require('expect.js')

describe('Control Flow', function(){
  var fn = function(arg, callback){
    expect(arg).to.be('something')
    process.nextTick(function(){
      callback(null, 'ok')
    })
  }

  it('should provide promise', function(done){
    flow.fiber(function(){
      var result = yield(fn('something', flow.promise()))
      expect(result).to.be('ok')
    }, done)
  }),

  it('should synchronize function', function(done){
    fn = flow.sync(fn)
    flow.fiber(function(){
      expect(yield(fn('something'))).to.be('ok')
    }, done)
  }),

  it('should be save aginst synchronizing function twice', function(done){
    fn = flow.sync(flow.sync(fn))
    flow.fiber(function(){
      expect(yield(fn('something'))).to.be('ok')
    }, done)
  }),

  it('should allow call synchronized function explicitly', function(done){
    fn = flow.sync(fn)
    fn('something', function(err, result){
      expect(result).to.be('ok')
      done(err)
    })
  }),

  it("should catch asynchronous errors", function(done){
    var fn = function(callback){
      process.nextTick(function(){
        callback(new Error('an error'))
      })
    }
    fn = flow.sync(fn)
    flow.fiber(function(){
      var err
      try {
        yield(fn())
      } catch (e) {
        err = e
      }
      expect(err.message).to.be('an error')
    }, done)
  }),

  it("should be compatible with not asynchronous callbacks", function(done){
    fn = function(callback){
      callback(null, 'ok')
    }
    fn = flow.sync(fn)
    flow.fiber(function(){
      expect(yield(fn())).to.be('ok')
    }, done)
  }),

  it("should catch non asynchronous errors", function(done){
    fn = function(callback){
      callback(new Error('an error'))
    }
    fn = flow.sync(fn)
    flow.fiber(function(){
      var err
      try {
        yield(fn())
      } catch (e) {
        err = e
      }
      expect(err.message).to.be('an error')
    }, done)
  })
})