diff --git a/Gruntfile.js b/Gruntfile.js
index 4384f19..7b38f99 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -57,7 +57,7 @@ module.exports = function(grunt) {
       options: {
         jshintrc: '.jshintrc'
       },
-      all: ['src/**/*.js', 'demo/js/*.js', '!src/module/*']
+      all: ['src/**/*.js', 'demo/js/*.js', 'tests/browser/TestDemo.js', '!src/module/*']
     },
     connect: {
       watch: {
@@ -107,6 +107,16 @@ module.exports = function(grunt) {
         src: 'build/<%= buildName %>.js',
         dest: 'build/<%= buildName %>.js'
       }
+    },
+    shell: {
+      testBrowser: {
+        command: 'phantomjs tests/browser/TestDemo.js',
+        options: {
+          execOptions: {
+            timeout: 1000 * 60
+          }
+        }
+      }
     }
   });
 
@@ -118,9 +128,11 @@ module.exports = function(grunt) {
   grunt.loadNpmTasks('grunt-contrib-copy');
   grunt.loadNpmTasks('grunt-contrib-yuidoc');
   grunt.loadNpmTasks('grunt-preprocess');
+  grunt.loadNpmTasks('grunt-shell');
 
   grunt.registerTask('default', ['test', 'build']);
   grunt.registerTask('test', ['jshint']);
+  grunt.registerTask('testBrowser', ['shell:testBrowser']);
   grunt.registerTask('dev', ['build:dev', 'connect:watch', 'watch']);
 
   grunt.registerTask('build', function(mode) {
diff --git a/package.json b/package.json
index 98e8906..20b9a7b 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
     "rigid body physics"
   ],
   "devDependencies": {
+    "fast-json-patch": "^0.5.4",
     "grunt": "~0.4.2",
     "grunt-contrib-concat": "~0.3.0",
     "grunt-contrib-connect": "~0.6.0",
@@ -28,7 +29,8 @@
     "grunt-contrib-uglify": "~0.2.7",
     "grunt-contrib-watch": "~0.5.3",
     "grunt-contrib-yuidoc": "~0.5.1",
-    "grunt-preprocess": "^4.1.0"
+    "grunt-preprocess": "^4.1.0",
+    "grunt-shell": "^1.1.2"
   },
   "scripts": {
     "dev": "npm install && grunt dev",
diff --git a/tests/browser/TestDemo.js b/tests/browser/TestDemo.js
index 3d63cf9..1f70c54 100644
--- a/tests/browser/TestDemo.js
+++ b/tests/browser/TestDemo.js
@@ -1,118 +1,52 @@
 var page = require('webpage').create();
 var fs = require('fs');
 var Resurrect = require('./lib/resurrect');
-var _ = require('./lib/lodash');
+var compare = require('fast-json-patch').compare;
+var system = require('system');
 
-page.onConsoleMessage = function(msg) {
-    console.log(msg);
-};
+var demo,
+    frames = 10,
+    testUrl = 'http://localhost:9000/demo/dev.html',
+    refsPath = 'tests/browser/refs',
+    diffsPath = 'tests/browser/diffs';
 
-page.onError = function(msg) {
-    console.log(msg);
-};
+var update = arg('--update'),
+    updateAll = typeof arg('--updateAll') !== 'undefined',
+    diff = arg('--diff');
 
-phantom.onError = function(msg, trace) {
-  var msgStack = ['PHANTOM ERROR: ' + msg];
-  if (trace && trace.length) {
-    msgStack.push('TRACE:');
-    trace.forEach(function(t) {
-      msgStack.push(' -> ' + (t.file || t.sourceURL) + ': ' + t.line + (t.function ? ' (in function ' + t.function +')' : ''));
-    });
-  }
-  console.error(msgStack.join('\n'));
-  phantom.exit(1);
-};
+var resurrect = new Resurrect({ cleanup: true }),
+    created = [],
+    changed = [];
 
-var log = function(msg) {
-    console.log(JSON.stringify(msg));
-}
-
-var type = function(obj) {
-    // https://javascriptweblog.wordpress.com/2011/08/08/fixing-the-javascript-typeof-operator/
-    if (obj === global) {
-      return "global";
-    }
-    return ({}).toString.call(obj).match(/\s([a-z|A-Z]+)/)[1].toLowerCase();
-};
-
-var compare = function(objectA, objectB) {
-    if (objectA === objectB) {
-        return { equal: true };
+var test = function(status) {
+    if (status === 'fail') {
+        console.log('failed to load', testUrl);
+        console.log('check dev server is running!');
+        console.log('use `grunt dev`');
+        phantom.exit(1);
+        return;
     }
 
-    if ((type(objectA) === 'undefined' && type(objectB) === 'null') 
-        || (type(objectA) === 'null' && type(objectB) === 'undefined')) {
-        return { equal: true };
-    }
-
-    if (type(objectA) !== type(objectB)) {
-        return { equal: false, expected: type(objectA), actual: type(objectB) };
-    }
-
-    if (_.isNumber(objectA)) {
-        if (objectA.toFixed(5) === objectB.toFixed(5)) {
-            return { equal: true };
-        } else {
-            return { equal: false, expected: objectA, actual: objectB };
-        }
-    } 
-
-    if (_.isArray(objectA)) {
-        var arrayDelta = [],
-            isEqual = true;
-    
-        for (var i = 0; i < Math.max(objectA.length, objectB.length); i++) {
-            var diff = compare(objectA[i], objectB[i]);
-            arrayDelta[i] = diff;
-
-            if (diff.equal !== true) {
-                isEqual = false;
-            }
-        }
-        
-        return isEqual ? { equal: true } : arrayDelta;
-    }
-
-    if (_.isObject(objectA)) {
-        var keys = _.union(_.keys(objectA), _.keys(objectB)),
-            objectDelta = { equal: true };
-
-        for (var i = 0; i < keys.length; i++) {
-            var key = keys[i],
-                diff = compare(objectA[key], objectB[key]);
-
-            if (diff.equal !== true) {
-                objectDelta[key] = diff;
-                objectDelta.equal = false;
-            }
-        }
-
-        return objectDelta.equal ? { equal: true } : objectDelta;
-    }
-
-    return { equal: false, expected: objectA, actual: objectB };
-};
-
-page.open('http://localhost:9000/demo/dev.html', function(status) {
     var demos = page.evaluate(function() {
-        var options = Array.prototype.slice.call(document.getElementById('demo-select').options);
-        return options.map(function(o) { return o.value });
+        var demoSelect = document.getElementById('demo-select'),
+            options = Array.prototype.slice.call(demoSelect);
+        return options.map(function(o) { return o.value; });
     });
 
-    var worldsPath = 'tests/browser/worlds',
-        diffsPath = 'tests/browser/diffs'
-        resurrect = new Resurrect({ cleanup: true }),
-        frames = 10;
-
     fs.removeTree(diffsPath);
-    fs.makeDirectory(diffsPath);
 
-    console.log(demos);
+    if (diff) {
+        fs.makeDirectory(diffsPath);
+    }
 
     for (var i = 0; i < demos.length; i += 1) {
-        var demo = demos[i],
-            worldStartPath = worldsPath + '/' + demo + '/' + demo + '-0.json',
-            worldEndPath = worldsPath + '/' + demo + '/' + demo + '-' + frames + '.json',
+        demo = demos[i];
+
+        var hasChanged = false,
+            hasCreated = false,
+            forceUpdate = update === demo || updateAll,
+            worldStartPath = refsPath + '/' + demo + '/' + demo + '-0.json',
+            worldEndPath = refsPath + '/' + demo + '/' + demo + '-' + frames + '.json',
             worldStartDiffPath = diffsPath + '/' + demo + '/' + demo + '-0.json',
             worldEndDiffPath = diffsPath + '/' + demo + '/' + demo + '-' + frames + '.json';
 
@@ -125,11 +59,13 @@ page.open('http://localhost:9000/demo/dev.html', function(status) {
 
         var worldEnd = page.evaluate(function(demo, frames) {
             var engine = Matter.Demo._engine;
+
             for (var j = 0; j <= frames; j += 1) {
                 Matter.Events.trigger(engine, 'tick', { timestamp: engine.timing.timestamp });
                 Matter.Engine.update(engine, engine.timing.delta);
                 Matter.Events.trigger(engine, 'afterTick', { timestamp: engine.timing.timestamp });
             }
+
             return engine.world;
         }, demo, frames);
 
@@ -137,32 +73,109 @@ page.open('http://localhost:9000/demo/dev.html', function(status) {
             var worldStartRef = resurrect.resurrect(fs.read(worldStartPath));
             var worldStartDiff = compare(worldStart, worldStartRef);
 
-            if (!worldStartDiff.equal) {
-                fs.write(worldStartDiffPath, JSON.stringify(worldStartDiff, null, 2), 'w');
-                console.log(demo, 'start equal:', worldStartDiff.equal);
+            if (worldStartDiff.length !== 0) {
+                if (diff) {
+                    fs.write(worldStartDiffPath, JSON.stringify(worldStartDiff, null, 2), 'w');
+                }
+
+                if (forceUpdate) {
+                    hasCreated = true;
+                    fs.write(worldStartPath, resurrect.stringify(worldStart, null, 2), 'w');
+                } else {
+                    hasChanged = true; 
+                }
             }
         } else {
-            console.warn('no existing start reference world for', demo);
-            fs.write(worldStartPath, resurrect.stringify(worldStart), 'w');
-            console.log('wrote', worldEndPath);
+            hasCreated = true;
+            fs.write(worldStartPath, resurrect.stringify(worldStart, null, 2), 'w');
         }
 
         if (fs.exists(worldEndPath)) {
             var worldEndRef = resurrect.resurrect(fs.read(worldEndPath));
             var worldEndDiff = compare(worldEnd, worldEndRef);
 
-            if (!worldEndDiff.equal) {
-                fs.write(worldEndDiffPath, JSON.stringify(worldEndDiff, null, 2), 'w');
-                console.log(demo, 'end equal:', worldEndDiff.equal);
+            if (worldEndDiff.length !== 0) {
+                if (diff) {
+                    fs.write(worldEndDiffPath, JSON.stringify(worldEndDiff, null, 2), 'w');
+                }
+
+                if (forceUpdate) {
+                    hasCreated = true;
+                    fs.write(worldEndPath, resurrect.stringify(worldEnd, null, 2), 'w');
+                } else {
+                    hasChanged = true;
+                }
             }
         } else {
-            console.warn('no existing end reference world for', demo);
-            fs.write(worldEndPath, resurrect.stringify(worldEnd), 'w');
-            console.log('wrote', worldEndPath);
+            hasCreated = true;
+            fs.write(worldEndPath, resurrect.stringify(worldEnd, null, 2), 'w');
+        }
+
+        if (hasChanged) {
+            changed.push("'" + demo + "'");
+            system.stdout.write('x');
+        } else if (hasCreated) {
+            created.push("'" + demo + "'");
+            system.stdout.write('+');
+        } else {
+            system.stdout.write('.');
         }
     }
 
-    console.log('done');
+    if (created.length > 0) {
+        console.log('\nupdated', created.join(', '));
+    }
 
-    phantom.exit();
-});
\ No newline at end of file
+    var isOk = changed.length === 0 ? 1 : 0;
+
+    console.log('');
+
+    if (isOk) {
+        console.log('ok');
+    } else {
+        console.log('changes detected on:');
+        console.log(changed.join(', '));
+        console.log('review, then --update [name] or --updateAll');
+        console.log('use --diff for diff log');
+    }
+
+    phantom.exit(!isOk);
+};
+
+function arg(name) {
+    var index = system.args.indexOf(name);
+    if (index >= 0) {
+        return system.args[index + 1] || true;
+    }
+    return undefined;
+}
+
+page.onError = function(msg, trace) {
+    setTimeout(function() {
+        var msgStack = ['testing \'' + demo + '\'', msg];
+
+        if (trace && trace.length) {
+            trace.forEach(function(t) {
+                msgStack.push(' -> ' + (t.file || t.sourceURL) + ': ' + t.line + (t.function ? ' (fn: ' + t.function +')' : ''));
+            });
+        }
+
+        console.log(msgStack.join('\n'));
+        phantom.exit(1);
+    }, 0);
+};
+
+
+page.onResourceReceived = function(res) {
+    setTimeout(function() {
+        if (res.stage === 'end'
+            && (res.status !== 304 && res.status !== 200 && res.status !== null)) {
+            console.log('error', res.status, res.url);
+            phantom.exit(1);
+        }
+    }, 0);
+};
+
+phantom.onError = page.onError;
+
+page.open(testUrl, test);
\ No newline at end of file
diff --git a/tests/browser/lib/lodash.js b/tests/browser/lib/lodash.js
deleted file mode 100644
index 4d6e9ff..0000000
--- a/tests/browser/lib/lodash.js
+++ /dev/null
@@ -1,98 +0,0 @@
-/**
- * @license
- * lodash 3.9.3 (Custom Build) lodash.com/license | Underscore.js 1.8.3 underscorejs.org/LICENSE
- * Build: `lodash modern -o ./lodash.js`
- */
-;(function(){function n(n,t){if(n!==t){var r=null===n,e=n===m,u=n===n,i=null===t,o=t===m,f=t===t;if(n>t&&!i||!u||r&&!o&&f||e&&f)return 1;if(n<t&&!r||!f||i&&!e&&u||o&&u)return-1}return 0}function t(n,t,r){for(var e=n.length,u=r?e:-1;r?u--:++u<e;)if(t(n[u],u,n))return u;return-1}function r(n,t,r){if(t!==t)return s(n,r);r-=1;for(var e=n.length;++r<e;)if(n[r]===t)return r;return-1}function e(n){return typeof n=="function"||false}function u(n){return typeof n=="string"?n:null==n?"":n+""}function i(n,t){for(var r=-1,e=n.length;++r<e&&-1<t.indexOf(n.charAt(r)););
-return r}function o(n,t){for(var r=n.length;r--&&-1<t.indexOf(n.charAt(r)););return r}function f(t,r){return n(t.a,r.a)||t.b-r.b}function l(n){return Nn[n]}function a(n){return Ln[n]}function c(n){return"\\"+Mn[n]}function s(n,t,r){var e=n.length;for(t+=r?0:-1;r?t--:++t<e;){var u=n[t];if(u!==u)return t}return-1}function p(n){return!!n&&typeof n=="object"}function h(n){return 160>=n&&9<=n&&13>=n||32==n||160==n||5760==n||6158==n||8192<=n&&(8202>=n||8232==n||8233==n||8239==n||8287==n||12288==n||65279==n);
-}function _(n,t){for(var r=-1,e=n.length,u=-1,i=[];++r<e;)n[r]===t&&(n[r]=L,i[++u]=r);return i}function v(n){for(var t=-1,r=n.length;++t<r&&h(n.charCodeAt(t)););return t}function g(n){for(var t=n.length;t--&&h(n.charCodeAt(t)););return t}function y(n){return zn[n]}function d(h){function Nn(n){if(p(n)&&!(Ti(n)||n instanceof Bn)){if(n instanceof zn)return n;if(ru.call(n,"__chain__")&&ru.call(n,"__wrapped__"))return Mr(n)}return new zn(n)}function Ln(){}function zn(n,t,r){this.__wrapped__=n,this.__actions__=r||[],
-this.__chain__=!!t}function Bn(n){this.__wrapped__=n,this.__actions__=null,this.__dir__=1,this.__filtered__=false,this.__iteratees__=null,this.__takeCount__=Su,this.__views__=null}function Mn(){this.__data__={}}function Pn(n){var t=n?n.length:0;for(this.data={hash:bu(null),set:new vu};t--;)this.push(n[t])}function qn(n,t){var r=n.data;return(typeof t=="string"||ve(t)?r.set.has(t):r.hash[t])?0:-1}function Dn(n,t){var r=-1,e=n.length;for(t||(t=Me(e));++r<e;)t[r]=n[r];return t}function Kn(n,t){for(var r=-1,e=n.length;++r<e&&false!==t(n[r],r,n););
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-return n!==m&&ru.call(e,r)?n:t}function tt(n,t,r){for(var e=-1,u=Ki(t),i=u.length;++e<i;){var o=u[e],f=n[o],l=r(f,t[o],o,n,t);(l===l?l===f:f!==f)&&(f!==m||o in n)||(n[o]=l)}return n}function rt(n,t){return null==t?n:ut(t,Ki(t),n)}function et(n,t){for(var r=-1,e=null==n,u=!e&&Ir(n),i=u?n.length:0,o=t.length,f=Me(o);++r<o;){var l=t[r];f[r]=u?Er(l,i)?n[l]:m:e?m:n[l]}return f}function ut(n,t,r){r||(r={});for(var e=-1,u=t.length;++e<u;){var i=t[e];r[i]=n[i]}return r}function it(n,t,r){var e=typeof n;return"function"==e?t===m?n:Mt(n,t,r):null==n?Fe:"object"==e?xt(n):t===m?Be(n):At(n,t);
-}function ot(n,t,r,e,u,i,o){var f;if(r&&(f=u?r(n,e,u):r(n)),f!==m)return f;if(!ve(n))return n;if(e=Ti(n)){if(f=jr(n),!t)return Dn(n,f)}else{var l=uu.call(n),a=l==D;if(l!=V&&l!=z&&(!a||u))return $n[l]?Or(n,l,t):u?n:{};if(f=kr(a?{}:n),!t)return rt(f,n)}for(i||(i=[]),o||(o=[]),u=i.length;u--;)if(i[u]==n)return o[u];return i.push(n),o.push(f),(e?Kn:vt)(n,function(e,u){f[u]=ot(e,t,r,u,n,i,o)}),f}function ft(n,t,r){if(typeof n!="function")throw new Je(N);return gu(function(){n.apply(m,r)},t)}function lt(n,t){
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-}),r}function pt(n,t,r,e){var u;return r(n,function(n,r,i){return t(n,r,i)?(u=e?r:n,false):void 0}),u}function ht(n,t,r){for(var e=-1,u=n.length,i=-1,o=[];++e<u;){var f=n[e];if(p(f)&&Ir(f)&&(r||Ti(f)||se(f))){t&&(f=ht(f,t,r));for(var l=-1,a=f.length;++l<a;)o[++i]=f[l]}else r||(o[++i]=f)}return o}function _t(n,t){qu(n,t,ke)}function vt(n,t){return qu(n,t,Ki)}function gt(n,t){return Du(n,t,Ki)}function yt(n,t){for(var r=-1,e=t.length,u=-1,i=[];++r<e;){var o=t[r];$i(n[o])&&(i[++u]=o)}return i}function dt(n,t,r){
-if(null!=n){r!==m&&r in zr(n)&&(t=[r]),r=0;for(var e=t.length;null!=n&&r<e;)n=n[t[r++]];return r&&r==e?n:m}}function mt(n,t,r,e,u,i){if(n===t)n=true;else if(null==n||null==t||!ve(n)&&!p(t))n=n!==n&&t!==t;else n:{var o=mt,f=Ti(n),l=Ti(t),a=B,c=B;f||(a=uu.call(n),a==z?a=V:a!=V&&(f=we(n))),l||(c=uu.call(t),c==z?c=V:c!=V&&we(t));var s=a==V,l=c==V,c=a==c;if(!c||f||s){if(!e&&(a=s&&ru.call(n,"__wrapped__"),l=l&&ru.call(t,"__wrapped__"),a||l)){n=o(a?n.value():n,l?t.value():t,r,e,u,i);break n}if(c){for(u||(u=[]),
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