diff -r 63a1376cbebd -r 092e0879a5ae testing2/docdiff_test.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing2/docdiff_test.sh	Tue Nov 20 13:42:32 2018 +0000
@@ -0,0 +1,136 @@
+#!/bin/bash
+
+# to make the script fail safely
+set -euo pipefail
+
+
+out=${1:-output}
+
+echo "" > $out
+
+echo "Below is the feedback for your submission docdiff.scala" >> $out
+echo "" >> $out
+
+
+# compilation tests
+
+function scala_compile {
+  (ulimit -t 30; JAVA_OPTS="-Xmx1g" scala "$1" 2>> $out 1>> $out) 
+}
+
+# functional tests
+
+function scala_assert {
+  (ulimit -t 30; JAVA_OPTS="-Xmx1g" scala -i "$1" "$2" -e "" 2> /dev/null 1> /dev/null)
+}
+
+# purity test
+
+function scala_vars {
+   (egrep '\bvar\b|\breturn\b|\.par|ListBuffer|mutable' "$1" 2> /dev/null 1> /dev/null)
+}
+
+
+# var, .par return, ListBuffer test
+#
+echo "docdiff.scala does not contain vars, returns etc?" >> $out
+
+if (scala_vars docdiff.scala)
+then
+  echo "  --> fail (make triple-sure your program conforms to the required format)" >> $out
+  tsts0=$(( 0 ))
+else
+  echo "  --> success" >> $out
+  tsts0=$(( 0 )) 
+fi
+
+### compilation test
+
+
+if  [ $tsts0 -eq 0 ]
+then 
+  echo "docdiff.scala runs?" >> $out
+
+  if (scala_compile docdiff.scala)
+  then
+    echo "  --> success" >> $out
+    tsts=$(( 0 ))
+  else
+    echo "  --> scala did not run docdiff.scala" >> $out
+    tsts=$(( 1 )) 
+  fi
+else
+  tsts=$(( 1 ))     
+fi
+
+### docdiff clean tests
+
+if [ $tsts -eq 0 ]
+then
+  echo "docdiff.scala tests:" >> $out
+  echo "  clean(\"ab a abc\") == List(\"ab\", \"a\", \"abc\")" >> $out
+  echo "  clean(\"ab*a abc1\") == List(\"ab\", \"a\", \"abc1\")" >> $out
+
+  if (scala_assert "docdiff.scala" "docdiff_test1.scala")
+  then
+    echo "  --> success" >> $out
+  else
+    echo "  --> one of the tests failed" >> $out
+  fi
+fi
+
+### docdiff occurrences tests
+
+if [ $tsts -eq 0 ]
+then
+  echo "  occurrences(List(\"a\", \"b\", \"b\", \"c\", \"d\")) == " >> $out
+  echo "      Map(\"a\" -> 1, \"b\" -> 2, \"c\" -> 1, \"d\" -> 1)" >> $out
+  echo "  " >> $out
+  echo "  occurrences(List(\"d\", \"b\", \"d\", \"b\", \"d\")) == " >> $out
+  echo "      Map(\"d\" -> 3, \"b\" -> 2)" >> $out
+
+  if (scala_assert "docdiff.scala" "docdiff_test2.scala") 
+  then
+    echo "  --> success" >> $out
+  else
+    echo "  --> one of the tests failed" >> $out
+  fi
+fi
+
+### docdiff prod tests
+
+if [ $tsts -eq 0 ]
+then
+  echo "  val l1 = List(\"a\", \"b\", \"b\", \"c\", \"d\")" >> $out
+  echo "  val l2 = List(\"d\", \"b\", \"d\", \"b\", \"d\")" >> $out
+  echo "  " >> $out
+  echo "  prod(l1, l2) == 7 " >> $out
+  echo "  prod(l1, l1) == 7 " >> $out
+  echo "  prod(l2, l2) == 13 " >> $out
+
+  if (scala_assert "docdiff.scala" "docdiff_test3.scala") 
+  then
+    echo "  --> success" >> $out
+  else
+    echo "  --> one of the tests failed" >> $out
+  fi
+fi
+
+### docdiff overlap tests
+
+if [ $tsts -eq 0 ]
+then
+  echo "  val l1 = List(\"a\", \"b\", \"b\", \"c\", \"d\")" >> $out
+  echo "  val l2 = List(\"d\", \"b\", \"d\", \"b\", \"d\")" >> $out
+  echo "  " >> $out
+  echo "  overlap(l1, l2) == 0.5384615384615384 " >> $out
+  echo "  overlap(l1, l1) == 1.0 " >> $out
+  echo "  overlap(l2, l2) == 1.0 " >> $out
+
+  if (scala_assert "docdiff.scala" "docdiff_test4.scala") 
+  then
+    echo "  --> success" >> $out
+  else
+    echo "  --> one of the tests failed" >> $out
+  fi
+fi