MSVS output to /build/ dir.

tools/testing/dart/test_suite.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 1313 matching lines @@
     return name;
   }
 
   static String outputDir(Map configuration) {
     var result = '';
     var system = configuration['system'];
     if (system == 'linux') {
       result = 'out/';
     } else if (system == 'macos') {
       result = 'xcodebuild/';
+    } else if (system == 'windows') {
+      result = 'build/';
     }
     return result;
   }
 
   static String buildDir(Map configuration) {
     String mode = (configuration['mode'] == 'debug') ? 'Debug' : 'Release';
     String arch = configuration['arch'].toUpperCase();
     return "${outputDir(configuration)}$mode$arch";
  }
 
@@ skipping 78 matching lines @@
  * $noCrash tests are expected to be flaky but not crash
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
 """;
     print(report);
    }
 }