Get rid of DART_SDK in 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 230 matching lines @@
 String yaml(value) => JSON.encode(value);
 
 /// The full path to the created sandbox directory for an integration test.
 String get sandboxDir => _sandboxDir;
 String _sandboxDir;
 
 /// The path of the package cache directory used for tests. Relative to the
 /// sandbox directory.
 final String cachePath = "cache";
 
-/// The path of the mock SDK directory used for tests. Relative to the sandbox
-/// directory.
-final String sdkPath = "sdk";
-
 /// The path of the mock app directory used for tests. Relative to the sandbox
 /// directory.
 final String appPath = "myapp";
 
 /// 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;
@@ skipping 68 matching lines @@
 void solo_integration(String description, void body()) =>
   _integration(description, body, solo_test);
 
 void _integration(String description, void body(), [Function testFn]) {
   testFn(description, () {
     // The windows bots are very slow, so we increase the default timeout.
     if (Platform.operatingSystem == "windows") {
       currentSchedule.timeout = new Duration(seconds: 10);
     }
 
-    // Ensure the SDK version is always available.
-    d.dir(sdkPath, [
-      d.file('version', '0.1.2.3')
-    ]).create();
-
     _sandboxDir = createSystemTempDir();
     d.defaultRoot = sandboxDir;
     currentSchedule.onComplete.schedule(() => deleteEntry(_sandboxDir),
         'deleting the sandbox directory');
 
     // Schedule the test.
     body();
   });
 }
 
@@ skipping 118 matching lines @@
 
   var dartArgs = ['--package-root=$_packageRoot/', '--checked', pubPath,
       '--verbose'];
   dartArgs.addAll(args);
 
   if (tokenEndpoint == null) tokenEndpoint = new Future.value();
   var environmentFuture = tokenEndpoint.then((tokenEndpoint) {
     var environment = {};
     environment['_PUB_TESTING'] = 'true';
     environment['PUB_CACHE'] = pathInSandbox(cachePath);
-    environment['DART_SDK'] = pathInSandbox(sdkPath);
+
+    // Ensure a known SDK version is set for the tests that rely on that.
+    environment['_PUB_TEST_SDK_VERSION'] = "0.1.2+3";
+
     if (tokenEndpoint != null) {
       environment['_PUB_TEST_TOKEN_ENDPOINT'] =
         tokenEndpoint.toString();
     }
 
     // If there is a server running, tell pub what its URL is so hosted
     // dependencies will look there.
     if (_hasServer) {
       return port.then((p) {
         environment['PUB_HOSTED_URL'] = "http://127.0.0.1:$p";
@@ skipping 351 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]);
   }
 }