  The next galactic supernova presents a once-in-a-lifetime opportunity to
obtain detailed information about the explosion of a star and the extreme
conditions found within its core. A core-collapse supernova will produce a
neutrino burst visible up to half a day before the electromagnetic radiation
from the explosion, so the burst will provide an early warning for optical
follow-up. Since local supernovae are exceedingly rare, it is critical that
neutrino detectors provide prompt alerts after the arrival of a burst. The
IceCube Neutrino Observatory operates with $>99\%$ uptime and is sensitive to a
variety of supernova models at levels $>10\sigma$ within the Milky Way. IceCube
will issue supernova alerts in real time. IceCube's high sensitivity to
supernovae, near perfect uptime, and ability to issue prompt alerts makes it a
critical component of the worldwide network of detectors known as the SuperNova
Early Warning System (SNEWS 2.0). A "Fire Drill" system was designed to inject
simulated supernova signals into the IceCube online system. We will discuss
IceCube's sensitivity to supernovae near the Milky Way, and describe the data
challenges used to ensure the readiness of IceCube and its operators. We will
also discuss the coordination of IceCube alerts and data challenges with SNEWS
2.0.
