diff --git a/static_src/shared/test/constants-issueV0.js b/static_src/shared/test/constants-issueV0.js
new file mode 100644
index 0000000..4f52aef
--- /dev/null
+++ b/static_src/shared/test/constants-issueV0.js
@@ -0,0 +1,42 @@
+// 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 = 'projects/project-name/issues/1234';
+
+export const ISSUE_REF_STRING = 'project-name:1234';
+
+/** @type {IssueRef} */
+export const ISSUE_REF = Object.freeze({
+  projectName: 'project-name',
+  localId: 1234,
+});
+
+/** @type {Issue} */
+export const ISSUE = Object.freeze({
+  projectName: 'project-name',
+  localId: 1234,
+  statusRef: {status: 'Available', meansOpen: true},
+});
+
+export const NAME_OTHER_PROJECT = 'projects/other-project-name/issues/1234';
+
+export const ISSUE_OTHER_PROJECT_REF_STRING = 'other-project-name:1234';
+
+/** @type {Issue} */
+export const ISSUE_OTHER_PROJECT = Object.freeze({
+  projectName: 'other-project-name',
+  localId: 1234,
+  statusRef: {status: 'Available', meansOpen: true},
+});
+
+export const NAME_CLOSED = 'projects/project-name/issues/5678';
+
+/** @type {Issue} */
+export const ISSUE_CLOSED = Object.freeze({
+  projectName: 'project-name',
+  localId: 5678,
+  statusRef: {status: 'Fixed', meansOpen: false},
+});