--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main_marking5/bf_test2.scala	Sun Jan 31 03:24:32 2021 +0000
@@ -0,0 +1,6 @@
+import CW10a._
+
+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))