Clean up unittest a bunch.

lib/src/configuration.dart

 // Copyright (c) 2013, 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 unittest.configuration;
 
-import 'package:unittest/unittest.dart' show TestCase, SimpleConfiguration;
+import 'simple_configuration.dart';
+import 'test_case.dart';
 
 /// Describes the interface used by the unit test system for communicating the
 /// results of a test run.
 abstract class Configuration {
-
   /// Creates an instance of [SimpleConfiguration].
   factory Configuration() => new SimpleConfiguration();
 
   /// Creates an [Configuration] instances that does nothing.
   ///
   /// For use by subclasses which wish to implement only a subset of features.
   Configuration.blank();
 
-  /// If [:true:], tests are started automatically. Otherwise [runTests]
-  /// must be called explicitly after tests are set up.
-  bool get autoStart => true;
+  /// If `true`, tests are started automatically once they're finished being defined.
+  ///
+  /// Otherwise, [runTests] must be called explicitly after tests are set up.
+  final autoStart = true;
 
   /// How long a [TestCase] can run before it is considered an error.
   /// A [timeout] value of [:null:] means that the limit is infinite.
   Duration timeout = const Duration(minutes: 2);
 
   /// Called as soon as the unittest framework becomes initialized.
   ///
   /// This is done even before tests are added to the test framework. It might
   /// be used to determine/debug errors that occur before the test harness
   /// starts executing. It is also used to tell the vm or browser that tests are
@@ skipping 26 matching lines @@
 
   /// Called with the result of all test cases. Browser tests commonly override
   /// this to reformat the output.
   ///
   /// When [uncaughtError] is not null, it contains an error that occured outside
   /// of tests (e.g. setting up the test).
   void onSummary(int passed, int failed, int errors, List<TestCase> results,
       String uncaughtError) {}
 }