Tex. Nat. Res. Code § 86.142
A test to determine the deliverability and pressure of a gas well shall be made:
Acts 1977, 65th Leg., p. 2538, ch. 871, art. I, Sec. 1, eff. Sept. 1, 1977.
Amended by Acts 1995, 74th Leg., ch. 26, Sec. 2, eff. Sept. 1, 1995.