require_relative '../../../spec_helper'

ruby_version_is ""..."3.0" do
  require 'set'

  describe "SortedSet#merge" do
    it "adds the elements of the passed Enumerable to self" do
      SortedSet["a", "b"].merge(SortedSet["b", "c", "d"]).should == SortedSet["a", "b", "c", "d"]
      SortedSet[1, 2].merge([3, 4]).should == SortedSet[1, 2, 3, 4]
    end

    it "returns self" do
      set = SortedSet[1, 2]
      set.merge([3, 4]).should equal(set)
    end

    it "raises an ArgumentError when passed a non-Enumerable" do
      -> { SortedSet[1, 2].merge(1) }.should raise_error(ArgumentError)
      -> { SortedSet[1, 2].merge(Object.new) }.should raise_error(ArgumentError)
    end
  end
end