Del. Code tit. 31 § 4514
In any suit, action or proceeding involving the validity or enforcement of or relating to any contract of or bonds issued by an authority, the authority shall be conclusively deemed to have become established and authorized to transact business and exercise its powers under this chapter upon proof of the adoption of the appropriate resolution prescribed in § 4503 or § 4505 of this title. Each such resolution shall be deemed sufficient if it authorizes the exercise of powers under this chapter by the authority or other public body and finds in substantially the terms provided in § 4504 of this title (no further detail being necessary) that the conditions therein enumerated exist. A copy of such resolution duly certified by the municipal or county clerk, as the case may be, shall be admissible in evidence in any suit, action or proceeding.
31 Del. C. § 4514