Clearing out ActionMailer::Base.deliveries after RSpec test

RSpec.describe UserMailer do
  before do
    # ActionMailer::Base.deliveries is a regular array
    ActionMailer::Base.deliveries = []

    # or use ActionMailer::Base.deliveries.clear
  end

  it "sends welcome email" do
    user = create(:user)
    UserMailer.welcome_email(user).deliver_now
    expect(ActionMailer::Base.deliveries).to be_present
  end
end