The LCOM4 tab shows blocks of resources within a class that have tight relationship. Having more that one block here probably means that the class is assuming more than one responsibility.
When drilling down into unit tests execution measures, you will eventually reach the unit test class level:
This The Source tab simply displays the source code of your the unit test classfile:
This The Tests tab displays the result of the unit tests belonging to the unit tests test class.
In case the test failed or was in of a failure or an error, the reason of the issue can be viewed.is displayed:
Since Sonar 3.5, it is also possible to display the files covered by a specific unit test:
This The Violations tab displays the violations on the unit tests: