Control whether pub build and serve minify or not.

sdk/lib/_internal/pub/test/test_pub.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.
 
 /// Test infrastructure for testing pub. Unlike typical unit tests, most pub
 /// tests are integration tests that stage some stuff on the file system, run
 /// pub, and then validate the results. This library provides an API to build
 /// tests like that.
 library test_pub;
 
@@ skipping 38 matching lines @@
 /// The current [HttpServer] created using [serve].
 var _server;
 
 /// The list of paths that have been requested from the server since the last
 /// call to [getRequestedPaths].
 final _requestedPaths = <String>[];
 
 /// The cached value for [_portCompleter].
 Completer<int> _portCompleterCache;
 
+/// A [Matcher] that matches JavaScript generated by dart2js with minification
+/// enabled.
+Matcher isMinifiedDart2JSOutput =
+    isNot(contains("// The code supports the following hooks"));
+
+/// A [Matcher] that matches JavaScript generated by dart2js with minification
+/// disabled.
+Matcher isUnminifiedDart2JSOutput =
+    contains("// The code supports the following hooks");
+
 /// The completer for [port].
 Completer<int> get _portCompleter {
   if (_portCompleterCache != null) return _portCompleterCache;
   _portCompleterCache = new Completer<int>();
   currentSchedule.onComplete.schedule(() {
     _portCompleterCache = null;
   }, 'clearing the port completer');
   return _portCompleterCache;
 }
 
@@ skipping 762 matching lines @@
   bool matches(item, Map matchState) {
     if (item is! Pair) return false;
     return _firstMatcher.matches(item.first, matchState) &&
         _lastMatcher.matches(item.last, matchState);
   }
 
   Description describe(Description description) {
     description.addAll("(", ", ", ")", [_firstMatcher, _lastMatcher]);
   }
 }