Nine tests each rebuilt the same ten-line create call to vary one argument,
which buried the rule every case was actually protecting. They are now one
parametrised test over a shared base, with an id per case so a failure names
the rule rather than an index.
The count of assertions is unchanged: the month and day cases were already
parametrised and are kept as separate entries rather than compressed, since
losing a case to tidy the file would defeat the point. The tests asserting a
successful create stay separate, because each checks a distinct resulting
value rather than merely that nothing raised.
jacobh2
9e27fef78a