ruby--ruby/spec/ruby/core/array/intersection_spec.rb

require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative 'shared/intersection'

describe "Array#&" do
  it_behaves_like :array_intersection, :&
end

ruby_version_is "2.7" do
  describe "Array#intersection" do
    it_behaves_like :array_intersection, :intersection

    it "accepts multiple arguments" do
      [1, 2, 3, 4].intersection([1, 2, 3], [2, 3, 4]).should == [2, 3]
    end

    it "preserves elements order from original array" do
      [1, 2, 3, 4].intersection([3, 2, 1]).should == [1, 2, 3]
    end
  end
end