Ruby

its copy of incorrectly closed https://bugs.ruby-lang.org/issues/17093

require 'rubygems' class A def initialize(type:) @type = type end def b p type p type.nil? type = 'default' if type.nil? type end private attr_accessor :type end RSpec.describe A do let(:type) { 'whoaaa' } it 'return default' do expect(A.new(type: type).b).to eq('default') end it 'instance variable is "whoaaa"' do expect(A.new(type: type).instance_variable_get(:@type)).to eq(type) end end all tests green output A "whoaaa" false return default instance variable is "whoaaa" 

have a look on method b, "p type.nil?" prints false, but next line type = 'default' will run