Build VS create

bout4.rb

describe "FactoryGirl.build VS FactoryGirl.create" do
  subject { book.save! }

  bout4_number_of = 200

  context "when setting up with FactoryGirl.build" do
    let(:book) { build(:book) }

    bout4_number_of.times do
      it "triggers ApplicationRecord.class in callback" do
        expect(ApplicationRecord).to receive(:class).at_least(:once)

        subject
      end
    end
  end

  context "when setting up with FactoryGirl.create" do
    let(:book) { create(:book) }

    bout4_number_of.times do
      it "triggers ApplicationRecord.class in callback" do
        expect(ApplicationRecord).to receive(:class).at_least(:once)

        subject
      end
    end
  end
end