diff -r a9d84442fb65 -r ec7a12806c3f marking5/bf1a_test.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/marking5/bf1a_test.scala	Wed Jan 16 12:20:34 2019 +0000
@@ -0,0 +1,5 @@
+
+assert(sread(Map(), 2) == 0)
+assert(sread(Map(2 -> 1), 2) == 1)
+assert(write(Map(), 1, 2) == Map(1 -> 2))
+assert(write(Map(1 -> 0), 1, 2) == Map(1 -> 2))