GitHub Classroom Assignment Autograder Scores

I have a C++ assignment that is currently running on GitHub Classroom. Each of the tests has been allocated points such that the whole assignment is worth 100 points. I have noticed that students are either scoring 0 or 100 points. I would expect that if some tests pass and others fail the total score should be the sum of points allocated to the tests that passed, but this seems not to be the case. I believe I have set up the assignment correctly since the grading is taking place, the issue seems to be associated with point allocation. I am not sure if there is a setting I have overlooked. Assistance would be appreciated.