Support relative paths in path dependencies.

utils/tests/pub/install/path/relative_symlink_test.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.
+
+import 'dart:io';
+
+import '../../../../../pkg/path/lib/path.dart' as path;
+
+import '../../../../pub/exit_codes.dart' as exit_codes;
+import '../../test_pub.dart';
+
+main() {
+  // Pub uses NTFS junction points to create links in the packages directory.
+  // These (unlike the symlinks that are supported in Vista and later) do not
+  // support relative paths. So this test, by design, will not pass on Windows.
+  // So just skip it.
+  if (Platform.operatingSystem == "windows") return;
+
+  initConfig();
+  integration("generates a symlink with a relative path if the dependency "
+              "path was relative", () {
+    dir("foo", [
+      libDir("foo"),
+      libPubspec("foo", "0.0.1")
+    ]).scheduleCreate();
+
+    dir(appPath, [
+      pubspec({
+        "name": "myapp",
+        "dependencies": {
+          "foo": {"path": "../foo"}
+        }
+      })
+    ]).scheduleCreate();
+
+    schedulePub(args: ["install"],
+        output: new RegExp(r"Dependencies installed!$"));
+
+    dir("moved").scheduleCreate();
+
+    // Move the app and package. Since they are still next to each other, it
+    // should still be found.
+    scheduleRename("foo", path.join("moved", "foo"));
+    scheduleRename(appPath, path.join("moved", appPath));
+
+    dir("moved", [
+      dir(packagesPath, [
+        dir("foo", [
+          file("foo.dart", 'main() => "foo";')
+        ])
+      ])
+    ]).scheduleValidate();
+  });
+}