The old method have_css didn't wait, apparently, the Capybara's max_wait_time. It has been changed in favor of find, one that waits the stablished time for an element to appear in the screen.
The old method have_css didn't wait, apparently, the Capybara's max_wait_time. It has been changed in favor of find, one that waits the stablished time for an element to appear in the screen.