diff -r e87462c9b895 -r d29cd5883c7b pre_marking1/collatz_test2.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pre_marking1/collatz_test2.scala	Fri Nov 27 00:55:24 2020 +0000
@@ -0,0 +1,16 @@
+//def myassert(cond : => Boolean) = {
+//  try {
+//    assert(cond)
+//  } catch { 
+//    case _ : Throwable => System.exit(1)
+//  }
+//}
+
+assert(CW6a.collatz_max(10) == (19, 9))
+assert(CW6a.collatz_max(100) == (118, 97))
+assert(CW6a.collatz_max(1000) == (178, 871))
+assert(CW6a.collatz_max(10000) == (261, 6171))
+assert(CW6a.collatz_max(100000) == (350, 77031))
+assert(CW6a.collatz_max(1000000) == (524, 837799))
+assert(CW6a.collatz_max(2) == (1, 2))
+assert(CW6a.collatz_max(77000) == (339, 52527))