Fix warnings.

sdk/lib/_internal/pub/test/version_solver_test.dart

 // 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.
 
 library pub_update_test;
 
 import 'dart:async';
 
 import 'package:unittest/unittest.dart';
 
 import '../lib/src/lock_file.dart';
 import '../lib/src/log.dart' as log;
 import '../lib/src/package.dart';
 import '../lib/src/pubspec.dart';
 import '../lib/src/sdk.dart' as sdk;
 import '../lib/src/source.dart';
-import '../lib/src/source_registry.dart';
 import '../lib/src/system_cache.dart';
 import '../lib/src/version.dart';
 import '../lib/src/solver/version_solver.dart';
 import 'test_pub.dart';
 
 MockSource source1;
 MockSource source2;
 
 main() {
   initConfig();
@@ skipping 924 matching lines @@
 
   Description describeMismatch(SolveResult result,
                                Description description,
                                Map state, bool verbose) {
     if (!result.succeeded) {
       description.add('Solver failed with:\n${result.error}');
       return null;
     }
 
     description.add('Resolved:\n${_listPackages(result.packages)}\n');
-    description.add(state.state);
+    description.add(state['failures']);
     return description;
   }
 
   bool matches(SolveResult result, Map state) {
     if (!result.succeeded) return false;
 
     var expected = new Map.from(_expected);
     var failures = new StringBuffer();
 
     for (var id in result.packages) {
@@ skipping 11 matching lines @@
       failures.writeln('Missing:\n${_listPackages(expected.values)}');
     }
 
     // Allow 1 here because the greedy solver will only make one attempt.
     if (result.attemptedSolutions != 1 &&
         result.attemptedSolutions != _maxTries) {
       failures.writeln('Took ${result.attemptedSolutions} attempts');
     }
 
     if (!failures.isEmpty) {
-      state.state = failures.toString();
+      state['failures'] = failures.toString();
       return false;
     }
 
     return true;
   }
 
   String _listPackages(Iterable<PackageId> packages) {
     return '- ${packages.join('\n- ')}';
   }
 }
@@ skipping 17 matching lines @@
     if (!_expected.isEmpty) {
       var textList = _expected.map((s) => '"$s"').join(", ");
       description.add(' The error should contain $textList.');
     }
     return description;
   }
 
   Description describeMismatch(SolveResult result,
                                Description description,
                                Map state, bool verbose) {
-    description.add(state.state);
+    description.add(state['failures']);
     return description;
   }
 
   bool matches(SolveResult result, Map state) {
     var failures = new StringBuffer();
 
     if (result.succeeded) {
       failures.writeln('Solver succeeded');
     } else {
       if (_expectedType != null && result.error.runtimeType != _expectedType) {
@@ skipping 10 matching lines @@
       }
 
       // Allow 1 here because the greedy solver will only make one attempt.
       if (result.attemptedSolutions != 1 &&
           result.attemptedSolutions != _maxTries) {
         failures.writeln('Took ${result.attemptedSolutions} attempts');
       }
     }
 
     if (!failures.isEmpty) {
-      state.state = failures.toString();
+      state['failures'] = failures.toString();
       return false;
     }
 
     return true;
   }
 }
 
 /// A source used for testing. This both creates mock package objects and acts
 /// as a source for them.
 ///
@@ skipping 115 matching lines @@
   var source = "mock1";
   var match = new RegExp(r"(.*) from (.*)").firstMatch(description);
   if (match != null) {
     name = match[1];
     source = match[2];
     if (source == "root") source = null;
   }
 
   callback(isDev, name, source);
 }