intkeygenerator/test/keyGenerator Tests.js

int secuential primarykey generator for SQL Server

var keyGenerator = require('../keyGenerator');
var chai = require('chai')
  , expect = chai.expect
  , should = chai.should();

var nextRangeStart = 0;

function setCallbackRange(){
	keyGenerator.setRangeReservationCallback(function (size, callback) {
		var next = nextRangeStart;
		nextRangeStart += size;
		callback(null, next);
	});
}



describe('keygenerator', function(){
	beforeEach(function() { 
		keyGenerator.reset(); 
		nextRangeStart = 0;
		setCallbackRange();
	});
	it('keyGenerator exporta un callback para pasarle la funcion que asigna los rangos.', function (){
		expect(keyGenerator.setRangeReservationCallback).to.exist;
	});	
	it('la funcion callback para generar suministrar rangos se puede asignar una sola vez.', function (){
		expect(function(){ keyGenerator.setRangeReservationCallback(function () { } )}).to.throw();
	});
	it('la funcion callback, al llamarla repetidamente, retorna la escala del valor size.', function (done){
		keyGenerator.getBlock(20, function(err, value){
			var rango = value; 	
			rango.should.be.equal(0);
		});
		keyGenerator.getBlock(20, function(err, value){
			var rango = value; 	
			rango.should.be.equal(20);
		});
		keyGenerator.getBlock(20, function(err, value){
			var rango = value; 	
			rango.should.be.equal(40);
		});
		keyGenerator.getBlock(20, function(err, value){
			var rango = value; 	
			rango.should.be.equal(60);
			done();
		});
	});
	it('next debe retornar numeros secuenciales', function (done){
		keyGenerator.next(function(err, value){
			value.should.be.equal(1);
			keyGenerator.next(function(err, value){
				value.should.be.equal(2);
				keyGenerator.next(function(err, value){
					value.should.be.equal(3);
					keyGenerator.next(function(err, value){
						value.should.be.equal(4);
						done();
					});		
				});
			});		
		});
	});
	it('Cuando se entregan todos los numeros del bloque asignado debe solicitar un nuevo bloque', function(done){
		keyGenerator.getBlock(5, function (err, value) {});
		for (var i = 1; i <= 5 ; i++){
			keyGenerator.next(function(err, value){});
		};
		keyGenerator.next(function(err, value){
			value.should.be.equal(6);
			done();
		});		
	});
	it('Si pido 2 bloques debe retornar numeros del segundo bloque', function(done){
		keyGenerator.getBlock(5, function (err, value) {});
		keyGenerator.getBlock(5, function (err, value) {});
		keyGenerator.next(function(err, value){
			value.should.be.equal(6);
			done();
		});		
	});
	it('si el callback para reservar un rango tiene error, value debe ser null', function(done){
		keyGenerator.reset();
		keyGenerator.setRangeReservationCallback(function (size, callback) {
			callback(new Error('Un error'), null);
		});

		keyGenerator.next(function(err, value){
			expect(err).to.exist;
			expect(value).to.not.exist;
			done();
		});		
	});
});