context "redirectable_document?" do
  let(:generator) { JekyllRedirectFrom::Generator.new }
  it "accepts subclasses of Jekyll::Document" do
    SubclassOfJekyllDocument = Class.new(Jekyll::Document)
    expect(generator.send(:redirectable_document?, SubclassOfJekyllDocument.new)).to be_truthy
  end

  it "accepts subclasses of Jekyll::Document" do
    SubclassOfJekyllPage = Class.new(Jekyll::Page)
    expect(generator.send(:redirectable_document?, SubclassOfJekyllPage.new)).to be_truthy
  end
end