What is the test for issuing a certificate of appeal against a motion denying a fundamental right?

28 U.S.C. 2253(c)(3). "Where a district court has rejected the constitutional claims on the merits, the showing required to satisfy 2253(c) is straightforward: [t]he petitioner must demonstrate that reasonable jurists would find the district court's assessment of the constitutional claims debatable or wrong." Slack v. McDaniel, 529 U.S. 473, 484 (2000).¹ For claims denied on procedural grounds, meanwhile, a certificate of appealability should issue "when the prisoner shows, at least, that jurists of reason would find it debatable whether the petition states a valid claim of the denial of a constitutional right and that jurists of reason would find it debatable whether the district court was correct in its procedural ruling." Id.