Test plan is a document that contains the scope, approach, test design and test strategies. It includes the following:-

1. Test case identifier

2. Scope

3.Features to be tested

4. Features not to be tested.

5. Test strategy.

6. Test Approach

7. Test Deliverables

8. Responsibilities.

9 Staffing and Training

10.Risk and Contingencies

11. Approval

While A test case is a noted/documented set of steps/activities that are carried out or executed on the software in order to confirm its functionality/behavior to certain set of inputs.