+ Notes: This solver is not a solver and does not converge to a solution. SNESTEST checks the Jacobian at three
+ points: the 0, 1, and -1 solution vectors. After doing these three tests, it always aborts with the error message
+ "SNESTest aborts after Jacobian test". No other behavior is to be expected. It may be similarly used to check if a
+ SNES function is the gradient of an objective function set with SNESSetObjective().
.seealso: SNESCreate(), SNES, SNESSetType(), SNESNEWTONLS, SNESNEWTONTR