add variable name for restart test debugging
@@ -291,4 +291,5 @@ def check_mpi_states(state_basedir, list_n_proc):
for var in ds_first_run.data_vars:
npt.assert_array_equal(ds_current_run[var].values,
ds_first_run[var].values,
- err_msg='States are not an exact match')
+ err_msg='States are not an exact match '
+ 'for variable: {}'.format(var))
