First there is Master Plan
which has Acceptance Test Plan,System Test Plan, Integration Test Plan, Unit Test Plan
System Test Plan has Test Design Specifications
Test Design Specifications have Test Cases
Test Cases are run by Test Procedure Specifications
1.Master Plan1.1. Acceptance Test Plan1.2. System Test Plan1.3. Integration Test Plan 1.4. Unit Test Plan
1.2.1. Test Design Specifications1.2.1.1.Test cases 1.2.1.1.1. Test Procedure Specifications