As each iteration, ``test_getg'' prints both the total energy and the difference of this total from the final converged result. (If your code converges to a slightly different result, simply change the print statement to subtract your final value.)
So that we may assess the effectiveness of the algorithm, to show the grader and to bring to lab of (a) the error as a function of iteration number and (b) the log (preferably, base 10) of the error as a function of iteration number.