Test plans, test case specifications, defect reports, UAT plans and summary reports.
Test Plan
What will be tested, how, by whom, and what we are consciously not testing.
Test Case Specification
Cases precise enough that two testers get the same result, and a failure is unambiguous.
Defect Report
Enough information for someone else to reproduce the problem without asking you a single question.
UAT Plan
How business users will decide whether to accept the system — and what happens when they do not.
Test Summary Report
What was tested, what was found, and what is being shipped with known problems.