diff -r 50a3b874008a -r 1616d06a0893 testing1/drumb_test7.scala
--- a/testing1/drumb_test7.scala	Sat Dec 15 13:46:54 2018 +0000
+++ b/testing1/drumb_test7.scala	Sat Dec 15 23:58:12 2018 +0000
@@ -1,26 +1,9 @@
 
-val urban_prices = List(List(Some(311.349976), Some(27.505054)), 
-			List(Some(300.222351), Some(42.357094)), 
-			List(Some(330.555054), Some(52.852215)))
-
-
-assert(CW6c.yearly_yield(CW6c.get_deltas(urban_prices), 100, 0) == 125)
-
-
-val urban_blchip_portfolio = List("GOOG", "AAPL", "MSFT", "IBM", "FB", "AMZN", "BIDU")
-val urban_rstate_portfolio = List("PLD", "PSA", "AMT", "AIV", "AVB", "BXP", "CCI", 
-                                  "DLR", "EQIX", "EQR", "ESS", "EXR", "FRT", "GGP", "HCP") 
-
-val urban_rstate_res = CW6c.investment(urban_rstate_portfolio, 1978 to 2017, 100)
-val urban_blchip_res = CW6c.investment(urban_blchip_portfolio, 1978 to 2017, 100)
-
-// the rstate value is 30895 because of a faulty ESS.cvs file
-
-// if you round after each year to a Long you get 30895 and 349597
-// if you work with doubles until the end and then round to a Long you get 30937 and 355204
-
-assert((urban_rstate_res > 30885 && urban_rstate_res < 30905) ||
-       (urban_rstate_res > 30927 && urban_rstate_res < 30947))
-
-assert((urban_blchip_res > 349587 && urban_blchip_res < 349607) ||
-       (urban_blchip_res > 355194 && urban_blchip_res < 355214))
+assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2000, 100) == 100)
+assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2001, 100) == 27)
+assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2002, 100) == 42)
+assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2003, 100) == 27)
+assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2004, 100) == 38)
+assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2005, 100) == 113)
+assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2006, 100) == 254)
+assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2007, 100) == 349)