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Initial version of Rosie

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1 parent 56aca0e commit 70826a200e580856e1712aadefca5eca5119ed38 @bkeepers bkeepers committed Apr 15, 2011
Showing with 180 additions and 0 deletions.
  1. +126 −0 spec/javascripts/rosie.spec.js
  2. +54 −0 src/rosie.js
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126 spec/javascripts/rosie.spec.js
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+describe('Factory', function() {
+ afterEach(function() {
+ Factory.factories = {};
+ });
+
+ describe('build', function() {
+ describe('with a constructor', function() {
+ var Thing = function(attrs) {
+ for(var attr in attrs) {
+ this[attr] = attrs[attr];
+ }
+ };
+
+ beforeEach(function() {
+ Factory.define('thing', Thing).attr('name', 'Thing 1');
+ });
+
+ it('should return a new instance of that constructor', function() {
+ expect(Factory.build('thing') instanceof Thing).toBe(true);
+ expect(Factory.build('thing').constructor).toBe(Thing);
+ });
+
+ it('should set attributes', function() {
+ expect(Factory.build('thing')).toEqual({name: 'Thing 1'});
+ });
+ });
+
+ describe('without a constructor', function() {
+ beforeEach(function() {
+ Factory.define('thing').attr('name', 'Thing 1');
+ });
+
+ it('should return object with attributes set', function() {
+ expect(Factory.build('thing')).toEqual({name:'Thing 1'});
+ });
+
+ it('should allow overriding attributes', function() {
+ expect(Factory.build('thing', {name:'changed'})).toEqual({name:'changed'});
+ });
+ });
+ });
+
+ describe('attributes', function() {
+ beforeEach(function() {
+ Factory.define('thing').attr('name', 'Thing 1');
+ });
+
+ it('should return object with attributes set', function() {
+ expect(Factory.attributes('thing')).toEqual({name:'Thing 1'});
+ });
+
+ it('should allow overriding attributes', function() {
+ expect(Factory.attributes('thing', {name:'changed'})).toEqual({name:'changed'});
+ });
+ });
+
+ describe('prototype', function() {
+ var factory;
+
+ beforeEach(function() {
+ factory = new Factory();
+ });
+
+ describe('attr', function() {
+ it('should add given value to attributes', function() {
+ factory.attr('foo', 'bar');
+ expect(factory.attributes().foo).toEqual('bar');
+ });
+
+ it('should invoke function', function() {
+ var calls = 0;
+ factory.attr('dynamic', function() { return ++calls; });
+ expect(factory.attributes().dynamic).toEqual(1);
+ expect(factory.attributes().dynamic).toEqual(2);
+ });
+
+ it('should return the factory', function() {
+ expect(factory.attr('foo', 1)).toBe(factory);
+ });
+ });
+
+ describe('sequence', function() {
+ it('should return the factory', function() {
+ expect(factory.sequence('id')).toBe(factory);
+ });
+
+ it('should return an incremented value for each invocation', function() {
+ factory.sequence('id');
+ expect(factory.attributes().id).toEqual(1);
+ expect(factory.attributes().id).toEqual(2);
+ expect(factory.attributes().id).toEqual(3);
+ });
+
+ it('should increment different sequences independently', function() {
+ factory.sequence('id');
+ factory.sequence('count');
+
+ expect(factory.attributes()).toEqual({id: 1, count: 1});
+ expect(factory.attributes()).toEqual({id: 2, count: 2});
+ });
+
+ it('should use custom function', function() {
+ factory.sequence('name', function(i) { return 'user' + i; });
+ expect(factory.attributes().name).toEqual('user1');
+ });
+ });
+
+ describe('attributes', function() {
+ beforeEach(function() {
+ factory.attr('foo', 1).attr('bar', 2);
+ });
+
+ it('should allow overriding an attribute', function() {
+ expect(factory.attributes({bar:3})).toEqual({foo:1, bar:3});
+ });
+
+ it('should allow overriding an attribute with a falsy value', function() {
+ expect(factory.attributes({bar:false})).toEqual({foo:1, bar:false});
+ });
+
+ it('should allow adding new attributes', function() {
+ expect(factory.attributes({baz:3})).toEqual({foo:1, bar:2, baz:3});
+ });
+ });
+ });
+});
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54 src/rosie.js
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+var Factory = function(constructor) {
+ this.construct = constructor;
+ this.attrs = {};
+ this.sequences = {};
+};
+
+Factory.prototype = {
+ attr: function(attr, value) {
+ callback = typeof value == 'function' ? value : function() { return value; };
+ this.attrs[attr] = callback;
+ return this;
+ },
+
+ sequence: function(attr, callback) {
+ var factory = this;
+ callback = callback || function(i) { return i; };
+ this.attrs[attr] = function() {
+ factory.sequences[attr] = factory.sequences[attr] || 0;
+ return callback(++factory.sequences[attr]);
+ };
+ return this;
+ },
+
+ attributes: function(attrs) {
+ attrs = attrs || {};
+ for(var attr in this.attrs) {
+ if(!attrs.hasOwnProperty(attr)) {
+ attrs[attr] = this.attrs[attr]();
+ }
+ }
+ return attrs;
+ },
+
+ build: function(attrs) {
+ var result = this.attributes(attrs);
+ return this.construct ? new this.construct(result) : result;
+ }
+};
+
+Factory.factories = {};
+
+Factory.define = function(name, constructor) {
+ var factory = new Factory(constructor);
+ this.factories[name] = factory;
+ return factory;
+};
+
+Factory.build = function(name, attrs) {
+ return this.factories[name].build(attrs);
+};
+
+Factory.attributes = function(name, attrs) {
+ return this.factories[name].attributes(attrs);
+};

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