Seven-times world champion Schumacher, who retired in 2006,
is set to fill in for Ferrari while Massa recovers.
Formula One regulations do not allow track testing during
the season, although Ferrari had hoped other teams would allow
an exception after Massa fractured his skull in an accident at
Hungarian Grand Prix qualifying last month.
"Guess who opposed the test with the F60?" Ferrari said on its Web site.
"A team that hasn't won anything for years and yet didn't
pass over the opportunity to demonstrate once more a lack of
spirit of fair play."
Williams last won the constructors championship in 1997,
when Canada's Jacques Villeneuve topped the driver's standings for them.
Ferrari also hit back at Williams' and Red Bull's argument
that Schumacher should be treated no differently than Spanish
teenager Jaime Alguersuari, who was unable to track-test his car
before his F1 debut for Toro Rosso in Hungary.
"Just for the record, the Scuderia Ferrari had given its
approval to let Alguersuari test, but it seems even in this
instance someone decided to stick to the precise wording of the
regulations," it said.
Seven-times world champion Schumacher completed 70 laps in a
2007 version Ferrari at Mugello near Florence last Friday.