Add base test for extending code highlighting

test/codehighlighting.js

@@ -0,0 +1,34 @@
+var _ = require('lodash');
+var should = require('should');
+var path = require('path');
+var fs = require('fs');
+
+var Plugin = require('../lib/plugin');
+var PLUGINS_ROOT = path.resolve(__dirname, 'plugins');
+
+describe('Code Highlighting', function () {
+    it('should correctly replace highlighting', function() {
+        return books.generate('highlight', 'website', {
+            prepare: function(book) {
+                var plugin = new Plugin(book, "highlight");
+                plugin.load("./highlight", PLUGINS_ROOT);
+
+                book.plugins.load(plugin);
+            }
+        })
+        .then(function(book) {
+            var PAGE = fs.readFileSync(
+                path.join(book.options.output, "index.html"),
+                { encoding: "utf-8" }
+            );
+
+            PAGE.should.be.html({
+                "code": {
+                    count: 1,
+                    text: 'code_test\n_code'
+                }
+            });
+        });
+    });
+});
+