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The strong_parameters gem has been integrated into rails edge by DHH and replaces attr_accessible.
Capybara’s “should_not have_css “#whatevs”, visibility: false” results in flaky tests if the content in question is being hidden after a process completes (such as an AJAX request).
An alternative is “should_not have_selector “#whatevs”, visible: false”. This results in substantially less flaky integration tests.