Were Ostfriesland's watertight doors closed?

Were Ostfriesland's watertight doors closed during the bombing tests?

Yes. The doors were closed, but nobody was aboard to shore up or fix small leaks.

Ostfriesland's watertight doors were closed. That did not supply the active response a crew could make after damage. Nobody remained aboard to shore up or fix small leaks. Closed doors alone therefore did not reproduce a crewed ship's damage control.