From cc79999a31b46e68a4dca5d536fc2fb4fe3d5199 Mon Sep 17 00:00:00 2001
From: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
Date: Fri, 14 Feb 2020 16:54:29 +0100
Subject: [PATCH] fix: force timezone to be UTC for tests (#38215)

react-calendar-heatmap's output depends on the timezone, which means
that snapshots can fail if the timezone changes.  This sets the timezone
as UTC during client tests to avoid that problem.
---
 client/jest-timezone-setup.js | 3 +++
 client/jest.config.js         | 1 +
 client/jest.test.js           | 6 ++++++
 3 files changed, 10 insertions(+)
 create mode 100644 client/jest-timezone-setup.js
 create mode 100644 client/jest.test.js

diff --git a/client/jest-timezone-setup.js b/client/jest-timezone-setup.js
new file mode 100644
index 0000000000..6e1fbf41d0
--- /dev/null
+++ b/client/jest-timezone-setup.js
@@ -0,0 +1,3 @@
+module.exports = async () => {
+  process.env.TZ = 'UTC';
+};
diff --git a/client/jest.config.js b/client/jest.config.js
index 86cabeba97..0922809dd1 100644
--- a/client/jest.config.js
+++ b/client/jest.config.js
@@ -12,6 +12,7 @@ module.exports = {
   globals: {
     __PATH_PREFIX__: ''
   },
+  globalSetup: './jest-timezone-setup.js',
   verbose: true,
   transform: {
     '^.+\\.js$': '<rootDir>/jest.transform.js'
diff --git a/client/jest.test.js b/client/jest.test.js
new file mode 100644
index 0000000000..9819289191
--- /dev/null
+++ b/client/jest.test.js
@@ -0,0 +1,6 @@
+/* global expect */
+describe('Timezones', () => {
+  it('should always be UTC', () => {
+    expect(new Date().getTimezoneOffset()).toBe(0);
+  });
+});