Use case describes the specific action done by the user (actor) upon the system to achieve certain predefined task. Use case is done in terms of the actor. It deals with the steps followed by the user to accomplish the task.It has no matter with the input data. Use case can solve the integration defects between different component while used by the actor. Use case designed from URS.
Test case is the combination of the Test conditions and Test data.It simply visualize the a particular task with a set of input data and expected output and certain test conditions. Test case is designed from SRS.