For obvious productivity reasons, I make an effort of learning and using as many of the keyboard shortcuts for the various Re# commands.
However, it seems that the unit
As for running all tests in solution the command is Alt-RUN, i.e. ALT+R for ReSharper menu, U for Unit Testing, and N for all tests in solution.
And if you're using the R# shortcuts, the chord Ctrl-U, L will always do the job.
NOTE: I found this answer from from stackoverflow user ilya-ryzhenkov on a related question