[recipes.cfg] ONLY support jsonpb.

unittests/errors_test.py

Index: unittests/errors_test.py
diff --git a/unittests/errors_test.py b/unittests/errors_test.py
index ab8d4a5ebf9fe4d9cb288f93d31e77e9a101c26f..4b48b042f73d555d7390f403972e6204776ab31b 100755
--- a/unittests/errors_test.py
+++ b/unittests/errors_test.py
@@ -21,17 +21,19 @@ class RecipeRepo(object):
     self._recipes_cfg = os.path.join(
         self._root, 'infra', 'config', 'recipes.cfg')
     with open(self._recipes_cfg, 'w') as fh:
-      fh.write("""
-api_version: 1
-project_id: "testproj"
-recipes_path: "%s"
-deps {
-  project_id: "recipe_engine"
-  url: "%s"
-  branch: "master"
-  revision: "HEAD"
-}
-""" % (recipes_path, ROOT_DIR))
+      json.dump({
+        "api_version": 1,
+        "project_id": "testproj",
+        "recipes_path": recipes_path,
+        "deps": [
+          {
+            "project_id": "recipe_engine",
+            "url": ROOT_DIR,
+            "branch": "master",
+            "revision": "HEAD"
+          }
+        ]
+      }, fh)
     self._recipes_dir = os.path.join(self._root, 'recipes')
     os.mkdir(self._recipes_dir)
     self._modules_dir = os.path.join(self._root, 'recipe_modules')