Listing all specs in order determined by seed in rspec

Question

I've noticed a couple specs that are failing intermittently depending on the order they're run.

To isolate them I'm looking for a command where I can enter the seed number and see all the specs listed with line numbers in the order determined by the seed number. Is this possible? using --format=documentation did not provide the info needed.

From there I will note the list of tests run BEFORE the intermittent failure each time it occurs and eventually narrow down to my culprit.

Answer 1

RSpec's JSON formatter outputs the filenames and line numbers in the order they were run:

rspec --seed 1 -f json > out.json

To get just the list of filenames with line numbers from the resulting out.json file:

require 'json'
data = JSON.parse(File.read('out.json'))
examples = data['examples'].map do |example| 
  "#{example['file_path']}:#{example['line_number']}"
end

Now examples will contain an array of file paths like:

["./spec/models/user_spec.rb:19", "spec/models/user_spec.rb:29"]