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

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

ruby_version_is "2.6" do
  describe "Array#difference" do
    it_behaves_like :array_binary_difference, :difference

    it "returns a copy when called without any parameter" do
      x = [1, 2, 3, 2]
      x.difference.should == x
      x.difference.should_not equal x
    end

    it "does not return subclass instances for Array subclasses" do
      ArraySpecs::MyArray[1, 2, 3].difference.should be_an_instance_of(Array)
    end

    it "accepts multiple arguments" do
      x = [1, 2, 3, 1]
      x.difference([], [0, 1], [3, 4], [3]).should == [2]
    end
  end
end