diff -r a6db2b70abdd -r 864107857d27 core_marking1/collatz_test1.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core_marking1/collatz_test1.scala	Mon Apr 11 23:55:27 2022 +0100
@@ -0,0 +1,8 @@
+
+
+assert(C1.collatz(1) == 0)
+assert(C1.collatz(6) == 8)
+assert(C1.collatz(9) == 19)
+assert(C1.collatz(9000) == 47)
+
+