[recipe_engine] Fix a couple path-related bugs.

unittests/repo_test_util.py

Index: unittests/repo_test_util.py
diff --git a/unittests/repo_test_util.py b/unittests/repo_test_util.py
index 664ab0ba40a1f4e5a0524fe64b93454b296af5be..4a1821d9cb72d60e5d94767d3b3669738094d940 100644
--- a/unittests/repo_test_util.py
+++ b/unittests/repo_test_util.py
@@ -113,19 +113,24 @@ class RepoTest(unittest.TestCase):
     """
     repos = {}
     for k in sorted(repo_deps):
+      deps=[package_pb2.DepSpec(
+          project_id='recipe_engine',
+          url="file://"+ROOT_DIR,
+      )] + [
+        package_pb2.DepSpec(
+          project_id=d,
+          url=repos[d]['root'],
+          branch='master',
+          revision=repos[d]['revision'],
+        )
+        for d in repo_deps[k]
+      ]
+
       repos[k] = self.create_repo(k, package_pb2.Package(
           api_version=1,
           project_id=k,
           recipes_path='',
-          deps=[
-              package_pb2.DepSpec(
-                  project_id=d,
-                  url=repos[d]['root'],
-                  branch='master',
-                  revision=repos[d]['revision'],
-              )
-              for d in repo_deps[k]
-          ],
+          deps=deps,
       ))
     return repos