diff -r 7fc6fa95519d -r d04b8569f124 core_testing1/collatz_test2.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core_testing1/collatz_test2.scala	Sat Nov 06 00:06:39 2021 +0000
@@ -0,0 +1,8 @@
+import C1._
+
+assert(collatz_max(10) == (19, 9))
+assert(collatz_max(100) == (118, 97))
+assert(collatz_max(1000) == (178, 871))
+assert(collatz_max(10000) == (261, 6171))
+assert(collatz_max(100000) == (350, 77031))
+assert(collatz_max(1000000) == (524, 837799))