Bugfix

There is no need to assert this if we are only doing a single timestep for warmup

src/timesteppers/common.py

@@ -80,7 +80,7 @@ def get_timesteps(self, t_final, warmup):
         """
         nt = 1 if warmup else int(np.round(t_final / self._dt))  # number of timesteps
         # check that dt divides the final time
-        assert abs(nt * self._dt - t_final) < 1.0e-12
+        assert warmup or (abs(nt * self._dt - t_final) < 1.0e-12)
         return nt
 
     @property