diff --git a/static_src/shared/test/constants-users.js b/static_src/shared/test/constants-users.js
new file mode 100644
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--- /dev/null
+++ b/static_src/shared/test/constants-users.js
@@ -0,0 +1,43 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'shared/typedef.js';
+
+export const NAME = 'users/1234';
+
+export const DISPLAY_NAME = 'example@example.com';
+
+export const ID = 1234;
+
+/** @type {UserRef} */
+export const USER_REF = Object.freeze({
+  userId: ID,
+  displayName: DISPLAY_NAME,
+});
+
+/** @type {User} */
+export const USER = Object.freeze({
+  name: NAME,
+  displayName: DISPLAY_NAME,
+});
+
+export const NAME_2 = 'users/5678';
+
+export const DISPLAY_NAME_2 = 'other_user@example.com';
+
+/** @type {User} */
+export const USER_2 = Object.freeze({
+  name: NAME_2,
+  displayName: DISPLAY_NAME_2,
+});
+
+/** @type {Object<string, User>} */
+export const BY_NAME = Object.freeze({[NAME]: USER, [NAME_2]: USER_2});
+
+/** @type {ProjectMember} */
+export const PROJECT_MEMBER = Object.freeze({
+  name: 'projects/proj/members/1234',
+  role: 'CONTRIBUTOR',
+});
+