Added unit tests.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "tests/nodeunit"]
+	path = tests/nodeunit
+	url = git://github.com/caolan/nodeunit.git

README.md

@@ -1,6 +1,8 @@
 # CRC for node.js
 
-This is a basic port/copy of the JavaScript CRC implementation. The module is compatible with RequireJS.
+This is a basic port/copy of the JavaScript CRC implementation. The module is compatible with Node.js and Require.js.
+
+This is an almost direct copy from http://www.digsys.se/JavaScript/CRC.aspx 
 
 ## Functions
 

tests/crc_tests.js

@@ -0,0 +1,64 @@
+#!/usr/bin/env ./nodeunit/bin/nodeunit
+
+var crc = require('../lib/crc');
+
+var fixture = {
+	'crc8': [
+		['hello world', 64]
+	],
+
+	'crc16': [
+		['hello world', 15332]
+	],
+
+	'crc32': [
+		['hello world', 222957957]
+	],
+
+	'crcArc': [
+		['hello world', 14785]
+	],
+
+	'fcs16': [
+		['hello world', 44550]
+	],
+
+	'hex8': [
+		[64, '40']
+	],
+
+	'hex16': [
+		[15332, '3BE4']
+	],
+
+	'hex32': [
+		[222957957, '0D4A1185']
+	]
+};
+
+var suite = module.exports['crc'] = {};
+
+for(var func in fixture)
+{
+	var list = fixture[func];
+
+	for(var i = 0; i < list.length; i++)
+	{
+		var input	= list[i][0],
+			output	= list[i][1],
+			name	= [ func, input, output ].join(' - ')
+			;
+
+		suite[name] = (function(func, input, output)
+		{
+
+			return function(assert)
+			{
+				assert.deepEqual(crc[func](input), output);
+				assert.done();
+			};
+
+		})(func, input, output);
+	}
+};
+