Add a dedicated Result for skipped tests.

lib/src/runner/reporter/json.dart

 // Copyright (c) 2015, 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.
 
 import 'dart:async';
 import 'dart:convert';
 
 import '../../backend/group.dart';
 import '../../backend/group_entry.dart';
 import '../../backend/live_test.dart';
 import '../../backend/metadata.dart';
+import '../../backend/state.dart';
 import '../../backend/suite.dart';
 import '../../backend/test_platform.dart';
 import '../../frontend/expect.dart';
 import '../../utils.dart';
 import '../engine.dart';
 import '../load_suite.dart';
 import '../reporter.dart';
 import '../version.dart';
 
 /// A reporter that prints machine-readable JSON-formatted test results.
@@ skipping 199 matching lines @@
   }
 
   /// Serializes [metadata] into a JSON-protocol-compatible map.
   Map _serializeMetadata(Metadata metadata) =>
       {"skip": metadata.skip, "skipReason": metadata.skipReason};
 
   /// A callback called when [liveTest] finishes running.
   void _onComplete(LiveTest liveTest) {
     _emit("testDone", {
       "testID": _liveTestIDs[liveTest],
-      "result": liveTest.state.result.toString(),
+      // For backwards-compatibility, report skipped tests as successes.
+      "result": liveTest.state.result == Result.skipped
+          ? "success"
+          : liveTest.state.result.toString(),
+      "skipped": liveTest.state.result == Result.skipped,
       "hidden": !_engine.liveTests.contains(liveTest)
     });
   }
 
   /// A callback called when [liveTest] throws [error].
   void _onError(LiveTest liveTest, error, StackTrace stackTrace) {
     _emit("error", {
       "testID": _liveTestIDs[liveTest],
       "error": error.toString(),
       "stackTrace": terseChain(stackTrace, verbose: _verboseTrace).toString(),
@@ skipping 27 matching lines @@
       GroupEntry entry, TestPlatform platform) {
     var frame = entry.trace?.frames?.first;
     if (!_jsLocations && platform.isJS) frame = null;
 
     map["line"] = frame?.line;
     map["column"] = frame?.column;
     map["url"] = frame?.uri?.toString();
     return map;
   }
 }