Tests should be able to display optional dumps

For example, lets say tests make bunch of requests and save bunch of logs. This is useful information needed for debugging, but should only be displayed in cases of error. So the tests should be able to save some stuff that is available via buttons, and optionally hide these buttons if there is no error. Or alternatively there should be some kind of special dumps that are hidden if there is no error, and in case of error a new button will appear that will reveal the dumps.