Hand generated cases:

- `min-n`         : Cases with a single day. Each one provides a different choice to be made.
- `non_monotonic` : Simple case to ensure they're allowing ups and downs not near the capacity.
                    (capacity 20): [buy 5] / [sell 3] / [acquire 4 via solar] / [sell 6]
- `purchase_a_lot`: Forces them to buy *a lot* of power every day. Two flavours of the same
                    thing to test slight variations. These can be up to 229 per day.
