diff -r 7d9b765d4012 -r b17a98b0c52f core_testing1/collatz_test.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core_testing1/collatz_test.sh	Sat Nov 06 00:06:39 2021 +0000
@@ -0,0 +1,118 @@
+#!/bin/bash
+
+# to make the script fail safely
+set -euo pipefail
+
+
+out=${1:-output}
+
+echo -e "" > $out
+
+echo -e "Below is the feedback for your submission collatz.scala" >> $out
+echo -e "" >> $out
+
+
+# compilation tests
+
+function scala_compile {
+  (ulimit -t 30; JAVA_OPTS="-Xmx1g" scala -Xprint:parser "$1" 2> c$out 1> c$out)
+}
+
+# functional tests
+
+function scala_assert {
+  (ulimit -t 30; JAVA_OPTS="-Xmx1g" scala -nc -i "$1" -- "$2" -e "" 2> /dev/null 1> /dev/null)
+}
+
+# purity test
+
+function scala_vars {
+   (egrep '\bvar\b|\breturn\b|\.par\.|\.par |ListBuffer|AtomicInteger|mutable|util.control|new Array' c$out 2> /dev/null 1> /dev/null)
+}
+
+
+### compilation test
+
+echo -e "collatz.scala runs?" >> $out
+
+if (scala_compile collatz.scala)
+then
+    echo -e "  --> success" >> $out
+    tsts=$(( 0 ))
+else
+    echo -e "  --> SCALA DID NOT RUN collatz.scala\n" >> $out
+    tsts=$(( 1 )) 
+fi
+
+
+
+# var, .par return, ListBuffer test
+#
+
+if  [ $tsts -eq 0 ]
+then
+   echo -e "collatz.scala does not contain VARS, RETURNS etc?" >> $out
+    
+   if (scala_vars collatz.scala)
+   then
+      echo -e "  --> FAIL (make triple-sure your program conforms to the required format)\n" >> $out
+      tsts=$(( 1 ))
+   else
+      echo -e "  --> success" >> $out
+      tsts=$(( 0 )) 
+   fi
+fi    
+
+
+### collatz tests
+
+if [ $tsts -eq 0 ]
+then
+  echo -e "collatz.scala tests:" >> $out
+  echo -e "  collatz(1) == 0" >> $out
+  echo -e "  collatz(6) == 8" >> $out
+  echo -e "  collatz(9) == 19" >> $out
+
+  if (scala_assert "collatz.scala" "collatz_test1.scala")
+  then
+    echo -e "  --> success" >> $out
+  else
+    echo -e "  --> ONE OF THE TESTS FAILED\n" >> $out
+  fi
+fi
+
+### collatz-max tests
+
+if [ $tsts -eq 0 ]
+then
+  echo -e "  collatz_max(10) == (19, 9)" >> $out
+  echo -e "  collatz_max(100) == (118, 97)" >> $out
+  echo -e "  collatz_max(1000) == (178, 871)" >> $out
+  echo -e "  collatz_max(10000) == (261, 6171)" >> $out
+  echo -e "  collatz_max(100000) == (350, 77031)" >> $out
+  echo -e "  collatz_max(1000000) == (524, 837799)" >> $out
+
+  if (scala_assert "collatz.scala" "collatz_test2.scala") 
+  then
+    echo -e "  --> success" >> $out
+  else
+    echo -e "  --> ONE OF THE TESTS FAILED\n" >> $out
+  fi
+fi
+
+
+### last-odd tests
+
+if [ $tsts -eq 0 ]
+then
+  echo -e "  last_odd(113) == 85" >> $out
+  echo -e "  last_odd(84) == 21" >> $out
+  echo -e "  last_odd(605) == 341" >> $out
+
+  if (scala_assert "collatz.scala" "collatz_test3.scala") 
+  then
+    echo -e "  --> success" >> $out
+  else
+    echo -e "  --> ONE OF THE TESTS FAILED\n" >> $out
+  fi
+fi