We use Jenkins to create automated flows to run Automation tests. The first part of test automation is to develop test strategy and test cases. Once automation test cases are ready for an application, we have to plug these into each Build run.
In each Build we run Unit tests, Integration tests and Functional tests.
With a Jenkins job, we can automate all these tasks. Once all the automated tests pass, we consider the build as green. This helps in deployment and release processes to build confidence on the application software.