Test Documentation: Test Plans and Test Cases

Test documentation helps you plan, execute, and repeat testing in a consistent way. This post covers test plans (the "what and how" of testing) and test cases (the concrete steps to run).

Test plan

A test plan describes the testing approach for a project or release. It usually includes:

• Scope (in and out of scope).
• Test levels and types (unit, integration, system, UAT; functional, regression).
• Schedule and resources.
• Environments and test data.
• Risks and mitigations.
• Entry/exit criteria (when to start and when to consider testing complete).

It can be a short document or a living wiki page; the goal is alignment and clarity.

Test case

A test case is a single, executable scenario. It typically has:

• ID and title.
• Preconditions.
• Steps (with expected result per step or at the end).
• Test data (if needed).
• Priority and type (e.g. functional, regression).

Well-written test cases are repeatable and useful for both manual and automated testing.

Test plan vs test cases

• Test plan: Strategy and scope for all testing.
• Test cases: Concrete scenarios that implement that strategy. You may have hundreds of test cases and one (or a few) test plans.

Summary

• Test plan = scope, approach, schedule, and criteria for testing.
• Test case = steps, expected results, and data for one scenario.
• Good documentation supports repeatability, onboarding, and automation.