What is the test for an ex post facto sentence in criminal law?

"Article I, section 10, clause 1 of the federal Constitution and article I, section 9 of the state Constitution prohibit the passage of ex post facto laws. [Citation.] California's ex post facto law is analyzed in the same manner as the federal prohibition. [Citation.]" (People v. Alford (2007) 42 Cal.4th 749, 755.) "A law which makes more burdensome the punishment for a crime after its commission violates ex post facto provisions . . . . [Citations.]" (People v. Fioretti (1997) 54 Cal.App.4th 1209, 1212-1213.) Thus, if the

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punishment of 25 years to life pursuant to section 667.61, subdivision (j)(2) exceeded the punishment defendant could have received under the applicable law when the offenses were committed, imposition of that sentence violated the ex post facto clauses of the federal and state Constitutions. (See Valenti, supra, 243 Cal.App.4th at p. 1174; People v. Hiscox (2006) 136 Cal.App.4th 253, 257 (Hiscox); People v. Alvarez (2002) 100 Cal.App.4th 1170, 1178.)