What did the Lemon Test formally create?

The Lemon Test, established by the Supreme Court in the 1971 case Lemon v. Kurtzman, formally created a three-pronged standard to evaluate whether a law violates the Establishment Clause of the First Amendment. The test assesses whether a law has a secular purpose, whether its primary effect neither advances nor inhibits religion, and whether it fosters an excessive government entanglement with religion. This framework has been used to determine the constitutionality of various government actions in relation to religious institutions.