feature: tag tests; choose tags on command line

lib/src/utils.dart

Index: lib/src/utils.dart
diff --git a/lib/src/utils.dart b/lib/src/utils.dart
index 4516351a9bbe2bf943a8d4b512363611ed8a3d90..6eff8d6b3fecd6ce0b4e7f9194cc563e861b0f41 100644
--- a/lib/src/utils.dart
+++ b/lib/src/utils.dart
@@ -189,19 +189,6 @@ Map mergeMaps(Map map1, Map map2) {
   return result;
 }
 
-/// Returns a new list with all elements in both [list1] and [list2].
-///
-/// If an element exists in both lists, it is listed only once in the result.
-List mergeLists(List list1, List list2) {
-  var result = []..addAll(list1);
-  list2.forEach((element) {
-    if (!result.contains(element)) {
-      result.add(element);
-    }
-  });
-  return result;
-}
-
 /// Returns a sink that maps events sent to [original] using [fn].
 StreamSink mapSink(StreamSink original, fn(event)) {
   var controller = new StreamController(sync: true);