[ruby-on-rails] How to run a single RSpec test?

Not sure how long this has bee available but there is an Rspec configuration for run filtering - so now you can add this to your spec_helper.rb:

RSpec.configure do |config|
  config.filter_run_when_matching :focus
end

And then add a focus tag to the it, context or describe to run only that block:

it 'runs a test', :focus do
  ...test code
end

RSpec documentation:

https://www.rubydoc.info/github/rspec/rspec-core/RSpec/Core/Configuration#filter_run_when_matching-instance_method

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