diff -r 0b727d1a8184 -r 194d6ee45800 main_testing5/bf_test4.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main_testing5/bf_test4.scala	Mon Nov 02 13:10:02 2020 +0000
@@ -0,0 +1,14 @@
+import CW10a._
+
+assert(run("[-]", Map(0 -> 100)) == Map(0 -> 0))
+assert(run("[->+<]", Map(0 -> 10)) == Map(0 -> 0, 1 -> 10))
+assert(run("[>>+>>+<<<<-]", Map(0 -> 42)) == Map(0 -> 0, 2 -> 42, 4 -> 42))
+assert(run("++++++++++#>+***#") == Map(0 -> 10, 1 -> 1000))
+assert(run("+++>+@+@+@+@+@") == Map(0 -> 3, 1 -> 7, 4 -> 3, 5 -> 3, 6 -> 3, 7 -> 3))
+
+
+
+val hw_urban = """+++++[->++++++++++<]>--<+++[->>++++++++++
+                  <<]>>++<<----------[+>.>.<+<]"""
+assert(run(hw_urban) == Map(0 -> 0, 1 -> 58, 2 -> 32))
+