diff -r ef5f62bf5987 -r 9a04eb6a2291 testing2/danube_test.sh
--- a/testing2/danube_test.sh	Tue Oct 29 23:56:13 2019 +0000
+++ b/testing2/danube_test.sh	Wed Oct 30 11:28:44 2019 +0000
@@ -37,7 +37,7 @@
 
 if (scala_vars danube.scala)
 then
-  echo "  --> fail (make triple-sure your program conforms to the required format)" >> $out
+  echo "  --> FAIL (make triple-sure your program conforms to the required format)" >> $out
   tsts0=$(( 0 ))
 else
   echo "  --> success" >> $out
@@ -56,7 +56,7 @@
     echo "  --> success" >> $out
     tsts=$(( 0 ))
   else
-    echo "  --> scala did not run danube.scala" >> $out
+    echo "  --> SCALA DID NOT RUN danube.scala" >> $out
     tsts=$(( 1 )) 
   fi
 else
@@ -73,9 +73,9 @@
 
   if (scala_assert "danube.scala" "danube_test1.scala")
   then
-    echo "  --> success" >> $out
+    echo -e "  --> success" >> $out
   else
-    echo "  --> one of the tests failed" >> $out
+    echo -e "  --> ONE OF THE TESTS FAILED\n" >> $out
   fi
 fi
 
@@ -91,9 +91,85 @@
 
   if (scala_assert "danube.scala" "danube_test2.scala") 
   then
-    echo "  --> success" >> $out
+    echo -e "  --> success" >> $out
   else
-    echo "  --> one of the tests failed" >> $out
+    echo -e "  --> ONE OF THE TESTS FAILED\n" >> $out
+  fi
+fi
+
+### danube groupById test
+
+if [ $tsts -eq 0 ]
+then
+  echo -e  "  val ls1 = List((\"1\", \"a\"), (\"2\", \"a\"), (\"1\", \"c\"), (\"2\", \"a\"), (\"1\", \"c\"))" >> $out
+  echo -e  "  val ls2 = List((\"1\", \"a\"), (\"1\", \"b\"), (\"2\", \"x\"), (\"3\", \"a\"), (\"2\", \"y\"), (\"3\", \"c\"))" >> $out
+  echo -e  "  groupById(ls1, Map()) == Map(1 -> List(c, c, a), 2 -> List(a, a))" >> $out
+  echo -e  "  groupById(ls2, Map()) == Map(1 -> List(b, a), 2 -> List(x, y), 3 -> List(c, a))" >> $out
+  echo -e  "      where the order in the lists is unimportant" >> $out
+  echo -e  "  val ls3 = (1 to 1000).map(_.toString).toList" >> $out
+  echo -e  "  val ls4 = ls3 zip ls3.tail" >> $out
+  echo -e  "  val ls5 = ls4 ::: ls4.reverse" >> $out
+  echo -e  "  groupById(ls5, Map()) == Map(1 -> List(2,2), 2 -> List(3,3), ....)" >> $out
+
+  if (scala_assert "danube.scala" "danube_test3.scala")
+  then
+      echo -e  -e "  --> success" >> $out
+  else
+      echo -e  -e "  --> ONE OF THE TESTS FAILED\n" >> $out
   fi
 fi
 
+### danube favourites tests
+
+if [ $tsts -eq 0 ]
+then
+  echo -e  "  val good_ratings = process_ratings(ratings)" >> $out
+  echo -e  "  val ratings_map = groupById(good_ratings, Map())" >> $out
+  echo -e  "  favourites(ratings_map, \"912\").length  == 80 " >> $out
+  echo -e  "  favourites(ratings_map, \"858\").length  == 158 " >> $out
+  echo -e  "  favourites(ratings_map, \"260\").length  == 201 " >> $out  
+
+  if (scala_assert "danube.scala" "danube_test4.scala") 
+  then
+    echo -e  "  --> success" >> $out
+  else
+    echo -e  "  --> ONE OF THE TESTS FAILED\n" >> $out
+  fi
+fi
+
+### danube suggestions tests
+
+if [ $tsts -eq 0 ]
+then
+  echo -e  "  val good_ratings = process_ratings(ratings)" >> $out
+  echo -e  "  val ratings_map = groupById(good_ratings, Map())" >> $out
+  echo -e  "  suggestions(ratings_map, \"912\").length  == 4110 " >> $out
+  echo -e  "  suggestions(ratings_map, \"858\").length  == 4883 " >> $out
+  echo -e  "  suggestions(ratings_map, \"260\").length  == 4970 " >> $out  
+
+  if (scala_assert "danube.scala" "danube_test5.scala") 
+  then
+    echo -e  "  --> success" >> $out
+  else
+    echo -e  "  --> ONE OF THE TESTS FAILED\n" >> $out
+  fi
+fi
+
+### danube recommendation tests
+
+if [ $tsts -eq 0 ]
+then
+  echo -e  "  recommendations(ratings_map, movies_map, \"1\").length  == 2 " >> $out
+  echo -e  "  recommendations(ratings_map, movies_map, \"2\").length  == 2 " >> $out
+  echo -e  "  recommendations(ratings_map, movies_map, \"3\").length  == 2 " >> $out
+  echo -e  "  recommendations(ratings_map, movies_map, \"4\").length  == 0 " >> $out
+  echo -e  "  recommendations(ratings_map, movies_map, \"5\").length  == 2 " >> $out
+
+  if (scala_assert "danube.scala" "danube_test6.scala") 
+  then
+    echo -e  "  --> success" >> $out
+  else
+    echo -e  "  --> ONE OF THE TESTS FAILED\n" >>  $out
+  fi
+fi
+