First pass at getting git and tar.gz working on Windows.

utils/tests/pub/test_pub.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.
 
 /**
  * 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.
  */
@@ skipping 1013 matching lines @@
   /**
    * Creates the files and directories within this tar file, then archives them,
    * compresses them, and saves the result to [parentDir].
    */
   Future<File> create(parentDir) {
     var tempDir;
     return parentDir.createTemp().chain((_tempDir) {
       tempDir = _tempDir;
       return Futures.wait(contents.map((child) => child.create(tempDir)));
     }).chain((_) {
-      var args = ["--directory", tempDir.path, "--create", "--gzip", "--file",
-          join(parentDir, _stringName)];
-      args.addAll(contents.map((child) => child.name));
-      return runProcess("tar", args);
+      if (Platform.operatingSystem != "windows") {
+        var args = ["--directory", tempDir.path, "--create", "--gzip",
+            "--file", join(parentDir, _stringName)];
+        args.addAll(contents.map((child) => child.name));
+        return runProcess("tar", args);
+      } else {
+        // Create the tar file.
+        var tarFile = join(tempDir, _stringName.replaceAll("tar.gz", "tar"));
+        var args = ["a", tarFile];
+        args.addAll(contents.map(
+            (child) => '-i!"${join(tempDir, child.name)}"'));
+
+        // Find 7zip. Note: this assumes the tests are being run from
+        // utils/tests/pub/
+        var scriptDir = new File(new Options().script).directorySync().path;
+        var command = fs.joinPaths(scriptDir,
+            '../../../third_party/7zip/7za.exe');
+
+        return runProcess(command, args).chain((_) {
+          // GZIP it. 7zip doesn't support doing both as a single operation.
+          args = ["a", join(parentDir, _stringName), tarFile];
+          return runProcess(command, args);
+        });
+      }
     }).chain((result) {
       if (!result.success) {
         throw "Failed to create tar file $name.\n"
             "STDERR: ${Strings.join(result.stderr, "\n")}";
       }
       return deleteDir(tempDir);
     }).transform((_) {
       return new File(join(parentDir, _stringName));
     });
   }
@@ skipping 88 matching lines @@
 }
 
 /**
  * Schedules a callback to be called after Pub is run with [runPub], even if it
  * fails.
  */
 void _scheduleCleanup(_ScheduledEvent event) {
   if (_scheduledCleanup == null) _scheduledCleanup = [];
   _scheduledCleanup.add(event);
 }