Move a bunch of src/ files into subdirectories.

lib/src/group.dart

Index: lib/src/group.dart
diff --git a/lib/src/group.dart b/lib/src/group.dart
deleted file mode 100644
index e7de57c9d55cc4066982ea6fd0ffe3e75db4217f..0000000000000000000000000000000000000000
--- a/lib/src/group.dart
+++ /dev/null
@@ -1,76 +0,0 @@
-// 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.
-
-library unittest.group;
-
-import 'dart:async';
-
-import 'utils.dart';
-
-/// A group contains multiple tests and subgroups.
-///
-/// A group has a description that is prepended to that of all nested tests and
-/// subgroups. It also has [setUp] and [tearDown] functions which are scoped to
-/// the tests and groups it contains.
-class Group {
-  /// The parent group, or `null` if this is the root group.
-  final Group parent;
-
-  /// The description of the current test group, or `null` if this is the root
-  /// group.
-  final String _description;
-
-  /// The set-up function for this group, or `null`.
-  AsyncFunction setUp;
-
-  /// The tear-down function for this group, or `null`.
-  AsyncFunction tearDown;
-
-  /// Returns the description for this group, including the description of any
-  /// parent groups.
-  ///
-  /// If this is the root group, returns `null`.
-  String get description {
-    if (parent == null || parent.description == null) return _description;
-    return "${parent.description} $_description";
-  }
-
-  /// Creates a new root group.
-  ///
-  /// This is the implicit group that exists outside of any calls to `group()`.
-  Group.root()
-      : this(null, null);
-
-  Group(this.parent, this._description);
-
-  /// Run the set-up functions for this and any parent groups.
-  ///
-  /// If no set-up functions are declared, this returns a [Future] that
-  /// completes immediately.
-  Future runSetUp() {
-    if (parent != null) {
-      return parent.runSetUp().then((_) {
-        if (setUp != null) return setUp();
-      });
-    }
-
-    if (setUp != null) return new Future.sync(setUp);
-    return new Future.value();
-  }
-
-  /// Run the tear-up functions for this and any parent groups.
-  ///
-  /// If no set-up functions are declared, this returns a [Future] that
-  /// completes immediately.
-  Future runTearDown() {
-    if (parent != null) {
-      return new Future.sync(() {
-        if (tearDown != null) return tearDown();
-      }).then((_) => parent.runTearDown());
-    }
-
-    if (tearDown != null) return new Future.sync(tearDown);
-    return new Future.value();
-  }
-}