Em.Logger...

gistfile1.txt

 
+    Em.Logger.assert = function myAssert(test, message) {
+        if (!test) {
+            try {
+                throw new Error(message);
+            } catch(e) {
+                console.log('ASSERT LOG: '+e.message+e.trace);
+            } finally {
+                console.trace('ASSERT: '+message);
+                console.assert(test, 'ASSERT: '+message);
+            }
+        }
+    };