Additional tests for Casadi modes

[BradyPlanden]

Description

At the moment, I believe the Casadi solver modes are tested on a toy model:

PyBaMM/tests/unit/test_solvers/test_casadi_solver.py

Line 17 in 90c1c35

def test_model_solver(self):

, but not formally across the particle models.

This issue is to add additional tests on an SPM or equivalent with assert for ensuring the results for each solver mode.

Motivation

As we are moving towards the "safe with events" mode in PyBOP, it would be ideal to have the mode tested for across the pybamm models.

Possible Implementation

No response

Additional context

No response