Use helper methods for running pub.

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 220 matching lines @@
 /// The path of the packages directory in the mock app used for tests. Relative
 /// to the sandbox directory.
 final String packagesPath = "$appPath/packages";
 
 /// Set to true when the current batch of scheduled events should be aborted.
 bool _abortScheduled = false;
 
 /// Enum identifying a pub command that can be run with a well-defined success
 /// output.
 class RunCommand {
-  static final install = new RunCommand('install',
-      new RegExp("Dependencies installed!\$"));
-
-  static final update = new RunCommand('update',
-      new RegExp("Dependencies updated!\$"));
+  static final install = new RunCommand('install', 'installed');
+  static final update = new RunCommand('update', 'updated');
 
   final String name;
   final RegExp success;
-  RunCommand(this.name, this.success);
+  RunCommand(this.name, String verb)
+      : success = new RegExp("Dependencies $verb!\$");
 }
 
 /// Many tests validate behavior that is the same between pub install and
 /// update have the same behavior. Instead of duplicating those tests, this
 /// takes a callback that defines install/update agnostic tests and runs them
 /// with both commands.
 void forBothPubInstallAndUpdate(void callback(RunCommand command)) {
   group(RunCommand.install.name, () => callback(RunCommand.install));
   group(RunCommand.update.name, () => callback(RunCommand.update));
 }
@@ skipping 484 matching lines @@
   bool matches(item, MatchState 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]);
   }
 }