Capybara - Click element by class name

find('.filter-case-studies').click as recommended here https://robots.thoughtbot.com/write-reliable-asynchronous-integration-tests-with-capybara#find-the-first-matching-element

The standard way of doing this in Capybara is

find('button.filter-case-studies').click

In relatively recent versions of Capybara you should also be able to do

click_on(class: 'filter-case-studies')