let_vs_let_bang

💡 Using let vs let!

Use let for lazy initialization and let! when you need data set up before each example runs. let only creates the object when referenced, while let! forces evaluation in a before hook. This helps optimize tests and avoid unexpected side effects.

RSpec.describe Order do
  let(:user) { create(:user) }
  let!(:order) { create(:order, user: user) }

  it "associates the order with the user" do
    expect(order.user).to eq(user)
  end
end