What are the different test plan documents in project?

The test plan documents that are prepared during a project are

Centre Test plan

Project Test plan

Unit Test plan

System Test plan

Integration Test plan

Acceptances Test plan

Central/Project test plan: This is the main test plan which outlines the
complete test strategy of the software project. This document should be
prepared before the start of the project and is used until the end of the
software development lifecyle.

Acceptance test plan: This test plan is normally prepared with the end
customer. This document commences during the requirement phase and is
completed at final delivery.

System test plan: This test plan starts during the design phase and proceeds
until the end of the project.

Integration and unit test plan: Both of these test plans start during the
execution phase and continue until the final delivery.