diff -r 50a3b874008a -r 1616d06a0893 testing1/drumb_test5.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing1/drumb_test5.scala	Sat Dec 15 23:58:12 2018 +0000
@@ -0,0 +1,20 @@
+
+// get_prices(List("GOOG", "AAPL"), 2010 to 2012)
+val urban_prices = List(List(Some(311.349976), Some(20.544939)), 
+                        List(Some(300.222351), Some(31.638695)), 
+                        List(Some(330.555054), Some(39.478039)))
+
+
+assert(get_deltas(urban_prices) == List(List(Some(-0.03573992567129673), Some(0.539975124774038)), 
+                                        List(Some(0.10103412653643493), Some(0.24777709700099845))))
+
+
+//get_prices(List("BIDU"), 2004 to 2008)
+val urban_prices2 = List(List(None), List(None), 
+                         List(Some(6.35)), List(Some(12.241)), 
+                         List(Some(38.188)))
+
+
+assert(get_deltas(urban_prices2) == List(List(None), List(None), 
+                                        List(Some(0.9277165354330709)), 
+                                        List(Some(2.119679764725104))))