Adding groups: simple registry for resources

lib/catnap.js

@@ -1 +1,2 @@
 module.exports.makeResource = require('./resource');
+module.exports.makeGroup = require('./group');

lib/group.js

@@ -0,0 +1,32 @@
+// A repository for resources.
+
+var util = require('./utils'),
+	variadic = util.variadic,
+	fluent = util.fluent,
+	maybe = util.maybe,
+	extend = util.extend,
+	compose = util.compose;
+
+var makeGroup = module.exports = function () {
+	var _resources = {};
+
+	var _group = function (r) {
+		var res = _resources[r];
+
+		if (!res) throw new Error('Resource ' + r + ' not found.');
+		return res;
+	};
+
+	// Adds one or many resources to the group
+	_group.add = fluent(maybe(variadic(function (resources) {
+		resources.forEach(function (r) {
+			if (!r._name) {
+				throw new Error("Can't add Resource: " + r);
+			}
+
+			_resources[r._name] = r;
+		});
+	})));
+
+	return _group;
+};

test/group_test.js

@@ -0,0 +1,42 @@
+var assert = require('assert'),
+	should = require('should'),
+	sinon = require('sinon'),
+	makeGroup = require('../').makeGroup,
+	makeResource = require('../').makeResource;
+
+describe('Group', function () {
+	describe('Create a group', function () {
+		it('Should create a new group', function () {
+			makeGroup().should.be.ok;
+		});
+	});
+
+	describe('Adding resources', function () {
+		var group;
+
+		beforeEach(function () {
+			group = makeGroup();
+		});
+
+		it('Should allow adding one or many resources', function () {
+			var one = makeResource('one', '/one'),
+				two = makeResource('two', '/two'),
+				three = makeResource('three', '/three');
+
+			group.add(one);
+			group.add(two, three);
+
+			group('one').should.eql(one);
+			group('two').should.eql(two);
+			group('three').should.eql(three);
+		});
+
+		it("Should throw if the Resource isn't available", function () {
+			[undefined, null, 'coffee'].forEach(function (v) {
+				assert.throws(function () {
+					group(v);
+				});
+			});
+		});
+	});
+});