Add configuration support for choosing test paths.

lib/src/runner/loader.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:io';
 import 'dart:isolate';
 
 import 'package:analyzer/analyzer.dart' hide Configuration;
 import 'package:async/async.dart';
@@ skipping 44 matching lines @@
 
   /// Creates a new loader that loads tests on platforms defined in [_config].
   ///
   /// [root] is the root directory that will be served for browser tests. It
   /// defaults to the working directory.
   Loader(this._config, {String root})
       : _root = root == null ? p.current : root;
 
   /// Loads all test suites in [dir].
   ///
-  /// This will load tests from files that end in "_test.dart". Any tests that
-  /// fail to load will be emitted as [LoadException]s.
+  /// This will load tests from files that match the configuration's filename
+  /// glob. Any tests that fail to load will be emitted as [LoadException]s.
   ///
   /// This emits [LoadSuite]s that must then be run to emit the actual
   /// [RunnerSuite]s defined in the file.
   Stream<LoadSuite> loadDir(String dir) {
     return mergeStreams(new Directory(dir).listSync(recursive: true)
         .map((entry) {
       if (entry is! File) return new Stream.fromIterable([]);
 
-      if (!entry.path.endsWith("_test.dart")) {
+      if (!_config.filename.matches(p.basename(entry.path))) {
         return new Stream.fromIterable([]);
       }
 
       if (p.split(entry.path).contains('packages')) {
          return new Stream.fromIterable([]);
       }
 
       return loadFile(entry.path);
     }));
   }
@@ skipping 187 matching lines @@
   Future close() {
     return _closeMemo.runOnce(() async {
       await Future.wait(_suites.map((suite) => suite.close()));
       _suites.clear();
 
       if (!_browserServerMemo.hasRun) return;
       await (await _browserServer).close();
     });
   }
 }