A use case is a scenario that describes how a user would interact with a system to accomplish a specific goal. In software testing, use cases can be used to define test cases, which are specific sets of steps that need to be executed in order to test the functionality of a system.
Use cases can also be used to define test data, which is the input that will be used during testing. Test data can be manually entered by the tester or generated automatically. Automated test data generation is often used in order to create large volumes of data that would be difficult to generate manually.
Use cases can also be used to define expected results, which are the outputs that should be produced by the system under test. Expected results can be captured in the form of screenshots, logs, or other artifacts.
Finally, use cases can also be used to define test conditions, which are the specific conditions under which a test should be executed. Test conditions can include things like environmental conditions, data conditions, or other factors that could affect the outcome of a test.