Step one towards stable error messages with details:

pkg/pkg.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Don't run any test-like files that show up in packages directories. It
 # shouldn't be necessary to run "pub install" in these packages, but if you do
 # it shouldn't break the tests.
 */packages/*/*: Skip
 */*/packages/*/*: Skip
 */*/*/packages/*/*: Skip
@@ skipping 90 matching lines @@
 typed_data/test/typed_buffers_test/01: Fail # Not supporting Int64List, Uint64List.
 
 analysis_server/test/search/element_references_test: Pass, Slow
 analysis_server/test/services/index/store/codec_test: Pass, Slow
 
 # Analysis server integration tests don't make sense to run under
 # dart2js, since the code under test always runs in the Dart vm as a
 # subprocess.
 analysis_server/test/integration: Skip
 
+polymer/test/build/unique_message_test: Skip # Intended only as a vm test.
+code_transformers/test/unique_message_test: Skip # Intended only as a vm test.
+
 [ $compiler == dart2js && $runtime == ff && $system == windows ]
 http/test/html/client_test: Fail # Issue 19750
 scheduled_test/test/scheduled_stream/scheduled_stream_test: Fail # Issue 19750
 json_rpc_2/test/server/server_test: Fail # Issue 19750
 shelf/test/log_middleware_test: Fail # Issue 19750
 
 [ $runtime == ff ]
 stack_trace/test/trace_test: Fail # Issue 19750
 http/test/html/client_test: Fail # Issue 19750
 scheduled_test/test/scheduled_stream/scheduled_stream_test: Fail # Issue 19750
@@ skipping 185 matching lines @@
 polymer/test/mirror_loader_test: Skip # tests development only behavior
 
 [ $compiler == dart2js && $runtime == chromeOnAndroid ]
 intl/test/date_time_format_http_request_test: Fail # TODO(kasperl): Please triage.
 
 [ $browser ]
 analysis_server/test/*: Skip # Uses dart:io.
 analysis_server/tool/spec/check_all_test: Skip # Uses dart:io.
 analyzer/test/*: Skip # Uses dart:io.
 barback/test/*: Fail, OK # Uses dart:io.
-code_transformers/test/*: Skip # Uses dart:io.
+code_transformers/test/assets_test: Skip # Uses dart:io
+code_transformers/test/entry_point_test: Skip # Uses dart:io
+code_transformers/test/resolver_test: Skip # Uses dart:io
+code_transformers/test/unique_message_test: Skip # Uses dart:io
 http/test/io/*: Fail, OK # Uses dart:io.
 http_parser/test/web_socket_test: Fail, OK # Uses dart:io
 http_multi_server/test/http_multi_server_test: Skip # Uses dart:io
 http_server/test/*: Fail, OK # Uses dart:io.
 intl/test/date_time_format_file_even_test: Fail, OK # Uses dart:io.
 intl/test/date_time_format_file_odd_test: Fail, OK # Uses dart:io.
 intl/test/find_default_locale_standalone_test: Fail, OK # Uses dart:io.
 intl/test/message_extraction/examples_parsing_test: Fail, OK # Users dart:io
 intl/test/message_extraction/failed_extraction_test: Fail, OK # Users dart:io
 intl/test/message_extraction/message_extraction_test: Fail, OK # Uses dart:io.
@@ skipping 143 matching lines @@
 oauth2/test/authorization_code_grant_test: Fail
 oauth2/test/client_test: Fail
 oauth2/test/credentials_test: Fail
 oauth2/test/handle_access_token_response_test: Fail
 
 [ $runtime == drt ]
 http/test/html/client_test: Skip # Issue 18566
 
 [ $system == windows ]
 analysis_server/test/integration/search/get_type_hierarchy_test: Pass, Fail # Issue 20436