1 import CW6b._

     2 

     3 

     4 

     5 assert(get_prices(List("GOOG", "AAPL"), 2010 to 2012) ==

     6    List(List(Some(312.204773), Some(26.782711)), 

     7         List(Some(301.0466), Some(41.244694)), 

     8         List(Some(331.462585), Some(51.464207))))

     9 

    10