fix test setup to work with the latest brms #155
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In the current brms github version (soon to be on CRAN), your test setup fails because it uses the internal
step
function of brms in one of its formulas. Due to a change in how non-linear formulas search for their variables,brms:::step
is no longer in the search path and I have yet to find a good and safe approach to include it there.This PR provides a little fix for the resulting problem in your test setup.