Fix the names of some tests.

sdk/lib/_internal/pub/lib/src/barback/load_all_transformers.dart

Index: sdk/lib/_internal/pub/lib/src/barback/load_all_transformers.dart
diff --git a/sdk/lib/_internal/pub/lib/src/barback/load_all_transformers.dart b/sdk/lib/_internal/pub/lib/src/barback/load_all_transformers.dart
index a03ce3acb8c881fe167871a39347b108fc2b045c..ac4ec0925ddaaa2c3954122da2d467299e909606 100644
--- a/sdk/lib/_internal/pub/lib/src/barback/load_all_transformers.dart
+++ b/sdk/lib/_internal/pub/lib/src/barback/load_all_transformers.dart
@@ -177,7 +177,7 @@ ApplicationException _cycleError(PackageGraph graph, String dependee,
       pairs(path).map((pair) {
     var transformers = unionAll(graph.packages[pair.first].pubspec.transformers)
         .where((id) => id.asset.package == pair.last)
-        .map(idToLibraryIdentifier).toList();
+        .map((id) => idToLibraryIdentifier(id.asset)).toList();
     if (transformers.isEmpty) {
       return "  ${pair.first} depends on ${pair.last}";
     } else {