Check fs for existsSync. Fixes #21

Updated test to exercise more of the codepaths.

lib/connect-cachify.js

@@ -11,7 +11,8 @@ var crypto = require('crypto'),
     path = require('path'),
     und = require('underscore');
 
-var opts,
+var existsSync = fs.existsSync || path.existsSync,
+    opts,
     _assets,
     _cache = {};
 
@@ -81,7 +82,7 @@ exports.setup = function (assets, options) {
           }
         } else {
           // Would we ever want to use cachify for non-file resources?
-          if (path.existsSync(path.join(opts.root, true_path))) {
+          if (existsSync(path.join(opts.root, true_path))) {
             exists = true;
             _cache[true_path] = {exists: true};
           } else {

test/express-test.js

@@ -55,7 +55,7 @@ exports.setup = nodeunit.testCase({
     test.equal(express3.version, EXPRESS_3_VER);
     [express2, express3].forEach(function (express, i) {
       var app = i === 0 ? express.createServer() : express();
-      app.use(cachify.setup());
+      app.use(cachify.setup([]));
       app.use(function (req, res, next) {
         var locals = res.locals();
         test.ok(!! locals.cachify);
@@ -67,7 +67,7 @@ exports.setup = nodeunit.testCase({
       var port = server.address().port;
       console.log('Started web server on port ' + port);
       var resText = "";
-      var req = http.request({ port: port, path: '/'}, function (res) {
+      var req = http.request({ port: port, path: '/baddecafe1/foo.js'}, function (res) {
         test.equal(res.statusCode, 200);
         res.on('data', function (chunk) {
           resText += chunk;