Merge pull request #6 from lucasfcosta/fix-anonymous-functions-ie

fix: tests for anonymous functions on IE

index.js

@@ -132,7 +132,8 @@ function getConstructorName(errorLike) {
     // If `err` is not an instance of Error it is an error constructor itself or another function.
     // If we've got a common function we get its name, otherwise we may need to create a new instance
     // of the error just in case it's a poorly-constructed error. Please see chaijs/chai/issues/45 to know more.
-    constructorName = getFunctionName(errorLike) || getFunctionName(new errorLike()); // eslint-disable-line new-cap
+    constructorName = getFunctionName(errorLike).trim() ||
+        getFunctionName(new errorLike()); // eslint-disable-line new-cap
   }
 
   return constructorName;