What is the test for making an equal protection claim under the equal protection clause?

"The concept of equal protection recognizes that persons who are similarly situated with respect to a law's legitimate purposes must be treated equally. [Citation.] Accordingly, ' "[t]he first prerequisite to a meritorious claim under the equal protection clause is a showing that the state has adopted a classification that affects two or more similarly situated groups in an unequal manner." ' [Citation.] 'This initial inquiry is not whether persons are similarly situated for all purposes, but "whether they are similarly situated for purposes of the law challenged." ' " (People v. Brown (2012) 54 Cal.4th 314, 328.) "The 'similarly situated' prerequisite simply means that an equal protection claim

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cannot succeed, and does not require further analysis, unless there is some showing that the two groups are sufficiently similar with respect to the purpose of the law in question that some level of scrutiny is required in order to determine whether the distinction is justified." (People v. Nguyen (1997) 54 Cal.App.4th 705, 714.)