Building on a previous post about debugging cucumber tests with ruby-debug, here’s a simple cucumber step definition you can use in your cucumber scenario in order to debug it:

Then /^I debug$/ do
  breakpoint
  0
end

Use it as follows:

Feature: Debug a cucumber scenario
  As a test writer
  In order to make my life easier
  I want to be able to debug

  Scenario: Calling the debugger in the middle of a test
    Given some condition
    Then I debug #this will call the debugger
    And I do something subsequent to debugging