Relative file path with RSpec

spec_helper.rb

# ...

RSPEC_ROOT = File.dirname __FILE__

your_file_spec.rb

require 'spec_helper'

RSpec.describe YourFile do

  describe '#method' do
    context '' do
      it '' do
        p RSPEC_ROOT
        File.open("#{RSPEC_ROOT}/resources/example_data.json")
      end
    end
  end
end