Add test suite.

This also documents gh issue fb55#8 with a failing test.

.gitignore

@@ -0,0 +1 @@
+node_modules

package.json

@@ -5,6 +5,15 @@
     "author": "Felix Boehm <me@feedic.com>",
     "keywords": ["html", "xml", "entity", "encoding"],
     "main": "./index.js",
+    "directories": {
+        "test": "test"
+    },
+    "devDependencies": {
+        "mocha": "~1.9.0"
+    },
+    "scripts": {
+        "test": "mocha"
+    },
     "repository": {
 		  "type": "git"
 		, "url": "git://github.com/fb55/node-entities.git"

test/mocha.opts

@@ -0,0 +1,2 @@
+--check-leaks
+--reporter spec

test/test.js

@@ -0,0 +1,38 @@
+var assert = require('assert');
+var entities = require('../');
+
+describe("Encode/decode test", function() {
+    var testcases = [
+        { input: "asdf & ÿ ü '",
+          xml: "asdf & ÿ ü '",
+          html4: "asdf & &yuml &uuml '",
+          html5: "asdf & &yuml &uuml '" },
+        { input: '&',
+          xml: '&',
+          html4: '&',
+          html5: '&' },
+    ];
+    testcases.forEach(function(tc) {
+        var encodedXML = entities.encodeXML(tc.input);
+        it('should XML encode '+tc.input, function() {
+            assert.equal(encodedXML, tc.xml);
+        });
+        it('should XML decode '+encodedXML, function() {
+            assert.equal(entities.decodeXML(encodedXML), tc.input);
+        });
+        var encodedHTML4 = entities.encodeHTML4(tc.input);
+        it('should HTML4 encode '+tc.input, function() {
+            assert.equal(encodedHTML4, tc.html4);
+        });
+        it('should HTML4 decode '+encodedHTML4, function() {
+            assert.equal(entities.decodeHTML4(encodedHTML4), tc.input);
+        });
+        var encodedHTML5 = entities.encodeHTML5(tc.input);
+        it('should HTML5 encode '+tc.input, function() {
+            assert.equal(encodedHTML5, tc.html5);
+        });
+        it('should HTML5 decode '+encodedHTML5, function() {
+            assert.equal(entities.decodeHTML5(encodedHTML5), tc.input);
+        });
+    });
+});