By default, test results are grouped by test type.  It may be interesting to group them differently, for instance by date or by tester.  This can be done by using the built-in column-header operations.

For this, you may first deselect the testtype to get a view on all test type results.  This is done by clicking on the testtype button in the ribbon.  

Now click with the right mouse-button on one of the column headers, for instance on the date column, and select 'Group by this column':

The results are now grouped per date:

You can even add a second grouping variable by dragging another column header to the top bar:

Now the first grouping variable is date and the second is tester...