diff -r bb69fdebf05a -r 8a1bd8ddb96c marking/drumb_test3.scala
--- a/marking/drumb_test3.scala	Tue Jan 16 10:47:29 2018 +0000
+++ b/marking/drumb_test3.scala	Fri Jan 19 14:09:08 2018 +0000
@@ -1,9 +1,3 @@
-//println("starting test now")
-
-import scala.concurrent._
-import scala.concurrent.duration._
-import ExecutionContext.Implicits.global
-import scala.language.postfixOps 
 
 val test_data = List(List(Some(71.539941), None), List(Some(76.974614), None), 
                      List(Some(65.226685), Some(6.35)), List(Some(78.354649), Some(12.241)), 
@@ -14,14 +8,9 @@
                        List(Some(0.20126676681483952), Some(0.9277165354330709)), 
                        List(Some(0.09141762603007778), Some(2.119679764725104)))
 
-lazy val f = Future {
-  assert((yearly_yield(test_deltas, 100, 0) - 107).abs <= 2)
-  assert((yearly_yield(test_deltas, 100, 1) - 85).abs <= 2)
-  assert((yearly_yield(test_deltas, 100, 2) - 156).abs <= 2)
-  assert((yearly_yield(test_deltas, 100, 3) - 210).abs <= 2)
-  assert((investment(List("IBM", "BIDU"), 2004 to 2008, 100) - 298).abs <= 10)
-}
+assert((yearly_yield(test_deltas, 100, 0) - 107).abs <= 2)
+assert((yearly_yield(test_deltas, 100, 1) - 85).abs <= 2)
+assert((yearly_yield(test_deltas, 100, 2) - 156).abs <= 2)
+assert((yearly_yield(test_deltas, 100, 3) - 210).abs <= 2)
+assert((investment(List("IBM", "BIDU"), 2004 to 2008, 100) - 298).abs <= 10)
 
-
-Await.result(f, 180 second)
-