output

  1) MirrorSync#execute_custom_script when the custom script succesfully runs should not raise any errors
     Failure/Error: expect { mirror_sync.execute_custom_script('false') }.to_not raise_error
     
       expected no Exception, got #<NameError: undefined local variable or method `e' for #<MirrorSync:0x00005601c08bce60>> with backtrace:
         # ./spec/models/mirror_sync_spec.rb:9:in `execute_custom_script'
         # ./spec/models/mirror_sync_spec.rb:20:in `block (5 levels) in <top (required)>'
         # ./spec/models/mirror_sync_spec.rb:20:in `block (4 levels) in <top (required)>'

sync.rb

class MirrorSync
  def execute_custom_script(cmd)
    begin
      output = %x(#{cmd})
      unless $?.exitstatus == 0
        raise Exception.new(e.message)
      end
     end
  end
end

sync_spec.rb

require 'rails_helper'

RSpec.describe MirrorSync, type: :model do
  describe '#execute_custom_script' do
    context 'when the custom script succesfully runs' do
      it 'should not raise any errors' do
        mirror_sync = MirrorSync.new
        expect { mirror_sync.execute_custom_script('false') }.to_not raise_error
      end
    end
  end
end