Support relative paths in path dependencies.

utils/tests/pub/install/path/absolute_symlink_test.dart

Index: utils/tests/pub/install/path/absolute_symlink_test.dart
diff --git a/utils/tests/pub/install/path/absolute_path_test.dart b/utils/tests/pub/install/path/absolute_symlink_test.dart
similarity index 56%
copy from utils/tests/pub/install/path/absolute_path_test.dart
copy to utils/tests/pub/install/path/absolute_symlink_test.dart
index cef0a760b07a95788a5b70111968d06c285b47bb..37aec85eca3fdc368e3d77bba0bda89566c6521d 100644
--- a/utils/tests/pub/install/path/absolute_path_test.dart
+++ b/utils/tests/pub/install/path/absolute_symlink_test.dart
@@ -4,14 +4,16 @@
 
 import '../../../../../pkg/path/lib/path.dart' as path;
 
+import '../../../../pub/exit_codes.dart' as exit_codes;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
-  integration('path dependency with absolute path', () {
-    dir('foo', [
-      libDir('foo'),
-      libPubspec('foo', '0.0.1')
+  integration("generates a symlink with an absolute path if the dependency "
+              "path was absolute", () {
+    dir("foo", [
+      libDir("foo"),
+      libPubspec("foo", "0.0.1")
     ]).scheduleCreate();
 
     dir(appPath, [
@@ -26,20 +28,17 @@ main() {
     schedulePub(args: ["install"],
         output: new RegExp(r"Dependencies installed!$"));
 
-    dir(packagesPath, [
-      dir("foo", [
-        file("foo.dart", 'main() => "foo";')
-      ])
-    ]).scheduleValidate();
-
-    // Move the packages directory and ensure the symlink still works. That
-    // will validate that we actually created an absolute symlink.
     dir("moved").scheduleCreate();
-    scheduleRename(packagesPath, "moved/packages");
 
-    dir("moved/packages", [
-      dir("foo", [
-        file("foo.dart", 'main() => "foo";')
+    // Move the app but not the package. Since the symlink is absolute, it
+    // should still be able to find it.
+    scheduleRename(appPath, path.join("moved", appPath));
+
+    dir("moved", [
+      dir(packagesPath, [
+        dir("foo", [
+          file("foo.dart", 'main() => "foo";')
+        ])
       ])
     ]).scheduleValidate();
   });