From the Application: Unit testing landing page, you can do the following tasks:

• View, open, and run unit test cases in your application, export all test cases in Excel format, and create test suites from selected test cases on the Test Cases tab and from existing test suites on the Test Suites tab. To access all test cases from your application stack, not just from the currently active application, select the Include built-on applications option on the Application: Quality Settings landing page.
  Note: If a test case is marked as disabled, you cannot run it from the landing page or from a test suite. To run a disabled test case, open it in Dev Studio and click ActionsRun.
• View a list of test cases with no associated rules in the Test cases tab by clicking Tests without rules.
• Create, view, open, and run Pega unit test suites in the Test Suites tab.
• View the test pass trend graph, the percentage of rules on which unit tests are configured, and see the run results of unit tests on the Reports tab.