Where to go next?
AS 7 Integration Testsuite User Guide if you changed JBoss AS 7 code and want to check for regressions.
AS 7 Testsuite Harness Developer Guide to learn how the testsuite works (shell scripts, Ant scripts, pom.xml files)
AS 7 Testsuite Test Developer Guide if you want to add a new test case to the testsuite (to increase code coverage or to reproduce a bug)