In actuality this doesn't represent a test.
To actually 'test' a weapons system, you need to develop operational scenarios with stressors, develop measures of effectiveness, etc., and run through the gambit of individual exercises of skill associated with use of the weapons' in enough environments to conduct an evaluation with quantified results. This looks like a 'range day' for US troops to 'try out' the Bren 2.
Even then it would be informative to know what they thought.