diff -r 34feeb53c0ba -r 0315d9983cd0 Attic/danube_test2.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Attic/danube_test2.scala	Sat Mar 11 22:01:53 2023 +0000
@@ -0,0 +1,23 @@
+
+import io.Source
+import scala.util._
+
+import M2._
+
+def urban_get_csv_file(name: String) : List[String] = {
+  val csv = Source.fromFile(name)
+  csv.mkString.split("\n").toList.drop(1)
+}
+
+val urban_ratings = urban_get_csv_file("ratings.csv")
+val urban_movies = urban_get_csv_file("movies.csv")
+
+val urban_res1 = process_ratings(urban_ratings)
+val urban_rat_elems = List(("1","1"), ("1","3"), ("1","6"), ("1","47"))
+
+assert(urban_res1.length == 48580)
+assert(urban_rat_elems.forall(urban_res1.contains(_)))
+
+assert(process_movies(urban_movies).length == 9742)
+
+