require_relative '../../spec_helper' ruby_version_is '2.5' do describe 'Thread#fetch' do describe 'with 2 arguments' do it 'returns the value of the fiber-local variable if value has been assigned' do th = Thread.new { Thread.current[:cat] = 'meow' } th.join th.fetch(:cat, true).should == 'meow' end it "returns the default value if fiber-local variable hasn't been assigned" do th = Thread.new {} th.join th.fetch(:cat, true).should == true end end describe 'with 1 argument' do it 'raises a KeyError when the Thread does not have a fiber-local variable of the same name' do th = Thread.new {} th.join -> { th.fetch(:cat) }.should raise_error(KeyError) end it 'returns the value of the fiber-local variable if value has been assigned' do th = Thread.new { Thread.current[:cat] = 'meow' } th.join th.fetch(:cat).should == 'meow' end end it 'raises an ArgumentError when not passed one or two arguments' do -> { Thread.current.fetch() }.should raise_error(ArgumentError) -> { Thread.current.fetch(1, 2, 3) }.should raise_error(ArgumentError) end end end