assert('<', '15.3.3.2.1') do class Foo include Comparable def <=>(x) 0 end end (Foo.new < Foo.new) == false end assert('<=', '15.3.3.2.2') do class Foo include Comparable def <=>(x) 0 end end (Foo.new <= Foo.new) == true end assert('==', '15.3.3.2.3') do class Foo include Comparable def <=>(x) 0 end end (Foo.new == Foo.new) == true end assert('>', '15.3.3.2.4') do class Foo include Comparable def <=>(x) 0 end end (Foo.new > Foo.new) == false end assert('>=', '15.3.3.2.5') do class Foo include Comparable def <=>(x) 0 end end (Foo.new >= Foo.new) == true end