diff -r 048fc6b70776 -r e776db3c808b main_marking5/bf_test4.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main_marking5/bf_test4.scala	Sun Jan 31 03:24:32 2021 +0000
@@ -0,0 +1,16 @@
+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))
+
+val hw_urban1 = """++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.
+                   +++++++..+++.>>.<-.<.+++.------.--------.>>+.>++."""
+
+assert(run(hw_urban1) == Map(0 -> 0, 5 -> 33, 1 -> 0, 6 -> 10, 2 -> 72, 3 -> 100, 4 -> 87))