What did you include in a test plan?

Introduction

Scope

Test strategy (unit test, system test, function test, performance test, security test and so on)

Environment requirements

Test schedule

Control procedure(Reviews, Bug Review meetings, Change Request, Defect Reporting)

Function to be tested

Resources and responsibilities

Deliverables

Dependencies

Risks and priority

Tools

Documentation(The documentation will be available at the end of the test phase.)