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@@ -95,6 +95,25 @@ so we need to set some guidelines for their use going forward:
[lets-not]: https://robots.thoughtbot.com/lets-not
+### Time-sensitive tests
+
+[Timecop](https://github.com/travisjeffery/timecop) is available in our
+Ruby-based tests for verifying things that are time-sensitive. Any test that
+exercises or verifies something time-sensitive should make use of Timecop to
+prevent transient test failures.
+
+Example:
+
+```ruby
+it 'is overdue' do
+ issue = build(:issue, due_date: Date.tomorrow)
+
+ Timecop.freeze(3.days.from_now) do
+ expect(issue).to be_overdue
+ end
+end
+```
+
### Test speed
GitLab has a massive test suite that, without parallelization, can take more