Expose aggregate transformers in barback.

pkg/barback/test/utils.dart

Index: pkg/barback/test/utils.dart
diff --git a/pkg/barback/test/utils.dart b/pkg/barback/test/utils.dart
index 4fa3d3f2357919f5c03a8dfd67825049be6ee4dc..1ff778a73848a520b120fcaf49bff645e8f45f09 100644
--- a/pkg/barback/test/utils.dart
+++ b/pkg/barback/test/utils.dart
@@ -15,6 +15,8 @@ import 'package:scheduled_test/scheduled_test.dart';
 import 'package:stack_trace/stack_trace.dart';
 import 'package:unittest/compact_vm_config.dart';
 
+export 'transformer/aggregate_many_to_many.dart';
+export 'transformer/aggregate_many_to_one.dart';
 export 'transformer/bad.dart';
 export 'transformer/bad_log.dart';
 export 'transformer/catch_asset_not_found.dart';
@@ -23,11 +25,15 @@ export 'transformer/check_content_and_rename.dart';
 export 'transformer/conditionally_consume_primary.dart';
 export 'transformer/create_asset.dart';
 export 'transformer/declare_assets.dart';
+export 'transformer/declaring_aggregate_many_to_many.dart';
+export 'transformer/declaring_aggregate_many_to_one.dart';
 export 'transformer/declaring_bad.dart';
 export 'transformer/declaring_check_content_and_rename.dart';
 export 'transformer/declaring_rewrite.dart';
 export 'transformer/emit_nothing.dart';
 export 'transformer/has_input.dart';
+export 'transformer/lazy_aggregate_many_to_many.dart';
+export 'transformer/lazy_aggregate_many_to_one.dart';
 export 'transformer/lazy_assets.dart';
 export 'transformer/lazy_bad.dart';
 export 'transformer/lazy_check_content_and_rename.dart';
@@ -35,6 +41,7 @@ export 'transformer/lazy_many_to_one.dart';
 export 'transformer/lazy_rewrite.dart';
 export 'transformer/many_to_one.dart';
 export 'transformer/mock.dart';
+export 'transformer/mock_aggregate.dart';
 export 'transformer/one_to_many.dart';
 export 'transformer/rewrite.dart';
 export 'transformer/sync_rewrite.dart';