A test case is described as a set of scenarios under which a tester decides whether or not an application is operating in accordance with the needs of the customer. Preconditions, case name, input requirements, and anticipated outcome are all included in test case design. An activity at the first level, test cases are derived from test scenarios.
It is a comprehensive document that includes all relevant inputs (both positive and negative) as well as the navigational steps required for the test execution procedure. Writing test cases is an one-time activity that can be utilised for regression testing in the future.