Factura_spec.rb

describe "class methods" do 
  describe ".calc_amount" do
    it "returns 0 when the invoice amount is nil"
    context "when the invoice status is 'Cancelado'" do
      it "returns invoice total when the invoice has polizas for the company"
      it "return 0.0 when the invoice doesnt has not polizas for the company"
    end
  end
end