Manual testing Create a course with multiple assessments (assign, quiz, scorm). Go to the gradebook. Make sure that the aggregation is set to Natural. Alter the weights and try to make them less than 0. Check that the weights are changed to 0. Make sure that the other grade weights are normalised to a total of 100. behat Run the feature file grade/tests/behat/grade_natural_normalisation.feature and check that there are no failures.