Can you explain what is meant by a dependent test case and how it is used in testing?

A dependent test case is a test that cannot be executed or correctly interpreted without the successful completion of another test. That is, its result depends on the state established by the previous test.

For example, if the first test creates a user in the system, and the second test checks the ability to authenticate that user, then the second test depends on the first.

Using dependent tests can be convenient for saving time and resources, but it reduces the independence and reliability of testing. Ideally, tests should be isolated so that they can be run in any order.

In practice, dependent tests are often used in integration testing, where the sequence of actions is important.