Failure: Expected 0 to be >= 1 on ruby on rails

The issue is that there is no html matching "Help | Ruby on Rails Tutorial Sample App".

if you look at the definition of assert_select, it accepts :count as (optional) argument. If the count is not specified, it sets the minimum occurrence of the html to 1. This is why the error you are getting is Expected 0 to be >= 1.. In your case there were 0 matches where the test expected at least 1 match.