require File.expand_path('../../../spec_helper', __FILE__) require 'set' describe "Set#merge" do it "adds the elements of the passed Enumerable to self" do Set[:a, :b].merge(Set[:b, :c, :d]).should == Set[:a, :b, :c, :d] Set[1, 2].merge([3, 4]).should == Set[1, 2, 3, 4] end it "returns self" do set = Set[1, 2] set.merge([3, 4]).should equal(set) end it "raises an ArgumentError when passed a non-Enumerable" do lambda { Set[1, 2].merge(1) }.should raise_error(ArgumentError) lambda { Set[1, 2].merge(Object.new) }.should raise_error(ArgumentError) end end