add test for dispose

index.js

@@ -166,7 +166,7 @@ var cache = {
         }
 
       };
-      log('created new cache function with name ' + fname);
+      log('created new cache function with name ' + fname + JSON.stringify(options));
       cachedfunc.cacheName = fname;
       return cachedfunc;
     };

test/maxkeys.js

@@ -0,0 +1,29 @@
+"use strict";
+
+var obcache = require('../index');
+var debug = require('../debug');
+var cache = debug.register(new obcache.Create({ max: 20, 
+                                                dispose: console.log.bind('deposed '), 
+                                                queueEnabled: true, 
+                                                reset: { interval: 2000, firstReset: new Date(Date.now() + 1000) } 
+                                              }));
+
+(function() {
+  var original = function (id,cb) {
+    console.log('original called for ' + id);
+    process.nextTick(function() {
+      var v = JSON.stringify({ p: id });
+      cb(null,v);
+    });
+  };
+  var wrapped = cache.wrap(original);
+
+  for (var i=0; i < 40; i++) {
+    wrapped(i,console.log);
+  }
+
+  process.nextTick(function() {
+    debug.log();
+  });
+
+}());