test/bson/object_id_test.rb in mongo-1.8.3 vs test/bson/object_id_test.rb in mongo-1.8.4.rc0

@@ -68,11 +68,17 @@
     assert_equal @o, o2
     assert_equal @o.to_s, o2.to_s
   end
 
   def test_illegal_from_string
-    assert_raise InvalidObjectId do 
+    assert_raise InvalidObjectId do
       ObjectId.from_string("")
+    end
+  end
+
+  def test_from_string_with_object_id
+    assert_raise InvalidObjectId do
+      ObjectId.from_string(@o)
     end
   end
 
   def test_legal
     assert !ObjectId.legal?(nil)