Move minitest.dart into the expect package.

pkg/dev_compiler/test/codegen/lib/html/documentfragment_test.dart

 // Copyright (c) 2011, 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:html';
 
-import 'package:minitest/minitest.dart';
+import 'package:expect/minitest.dart';
 
 import 'util.dart';
 
 main() {
   var isAnchorElement =
       predicate((x) => x is AnchorElement, 'is an AnchorElement');
 
   List<String> _nodeStrings(Iterable<Node> input) {
     var out = new List<String>();
     for (Node n in input) {
@@ skipping 151 matching lines @@
     expect(fragment.innerHtml, "foo<a>bar</a>");
   });
 
   test('query searches the fragment', () {
     var fragment = new DocumentFragment.html(
       "<div class='foo'><a>foo</a><b>bar</b></div>");
     expect(fragment.query(".foo a").tagName, "A");
     expect(_nodeStrings(fragment.queryAll(".foo *")), equals(["A", "B"]));
   });
 }