vyre-conform 0.1.0

Conformance suite for vyre backends — proves byte-identical output to CPU reference
Documentation 
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use crate::proof::algebra::checker::{verify_laws, VerificationLevel};
use crate::proof::algebra::inference::{infer_binary_laws, InferenceReport};
use crate::spec::law::{canonical_law_id, AlgebraicLaw};

#[cfg(test)]
mod tests {
    use super::*;

    fn add_cpu(input: &[u8]) -> Vec<u8> {
        let a = u32::from_le_bytes(input[..4].try_into().unwrap_or_default());
        let b = u32::from_le_bytes(input[4..8].try_into().unwrap_or_default());
        a.wrapping_add(b).to_le_bytes().to_vec()
    }

    fn sub_cpu(input: &[u8]) -> Vec<u8> {
        let a = u32::from_le_bytes(input[..4].try_into().unwrap_or_default());
        let b = u32::from_le_bytes(input[4..8].try_into().unwrap_or_default());
        a.wrapping_sub(b).to_le_bytes().to_vec()
    }

    #[test]
    fn audit_add_confirms_commutativity_and_identity_zero() {
        let report = audit_binary(
            "test.add",
            add_cpu,
            &[
                AlgebraicLaw::Commutative,
                AlgebraicLaw::Identity { element: 0 },
            ],
        );
        // Both declared laws should be confirmed.
        assert!(
            report
                .laws
                .iter()
                .any(|a| matches!(a.law, AlgebraicLaw::Commutative)
                    && matches!(a.verdict, AuditVerdict::Confirmed)),
            "commutativity must confirm on add: {report:?}"
        );
        assert!(
            report
                .laws
                .iter()
                .any(|a| matches!(a.law, AlgebraicLaw::Identity { element: 0 })
                    && matches!(a.verdict, AuditVerdict::Confirmed)),
            "identity 0 must confirm on add: {report:?}"
        );
        assert!(report.over_claimed().is_empty());
    }

    #[test]
    fn audit_sub_rejects_falsely_claimed_commutativity() {
        let report = audit_binary("test.sub", sub_cpu, &[AlgebraicLaw::Commutative]);
        assert!(
            report
                .laws
                .iter()
                .any(|a| matches!(a.verdict, AuditVerdict::OverClaimed { .. })),
            "subtraction is not commutative; the audit must reject the false claim: {report:?}"
        );
        assert!(!report.is_clean());
    }

    #[test]
    fn identity_subsumes_left_identity() {
        assert!(same_law(
            &AlgebraicLaw::Identity { element: 5 },
            &AlgebraicLaw::LeftIdentity { element: 5 }
        ));
    }

    #[test]
    fn identity_subsumes_right_identity() {
        assert!(same_law(
            &AlgebraicLaw::Identity { element: 5 },
            &AlgebraicLaw::RightIdentity { element: 5 }
        ));
    }

    #[test]
    fn left_identity_subsumes_identity_symmetric() {
        assert!(same_law(
            &AlgebraicLaw::LeftIdentity { element: 7 },
            &AlgebraicLaw::Identity { element: 7 }
        ));
    }

    #[test]
    fn right_identity_subsumes_identity_symmetric() {
        assert!(same_law(
            &AlgebraicLaw::RightIdentity { element: 7 },
            &AlgebraicLaw::Identity { element: 7 }
        ));
    }

    #[test]
    fn identity_does_not_subsume_different_element() {
        assert!(!same_law(
            &AlgebraicLaw::Identity { element: 5 },
            &AlgebraicLaw::LeftIdentity { element: 6 }
        ));
    }

    #[test]
    fn absorbing_subsumes_left_absorbing() {
        assert!(same_law(
            &AlgebraicLaw::Absorbing { element: 3 },
            &AlgebraicLaw::LeftAbsorbing { element: 3 }
        ));
    }

    #[test]
    fn absorbing_subsumes_right_absorbing() {
        assert!(same_law(
            &AlgebraicLaw::Absorbing { element: 3 },
            &AlgebraicLaw::RightAbsorbing { element: 3 }
        ));
    }

    #[test]
    fn left_absorbing_subsumes_absorbing_symmetric() {
        assert!(same_law(
            &AlgebraicLaw::LeftAbsorbing { element: 7 },
            &AlgebraicLaw::Absorbing { element: 7 }
        ));
    }

    #[test]
    fn right_absorbing_subsumes_absorbing_symmetric() {
        assert!(same_law(
            &AlgebraicLaw::RightAbsorbing { element: 7 },
            &AlgebraicLaw::Absorbing { element: 7 }
        ));
    }

    #[test]
    fn absorbing_does_not_subsume_different_element() {
        assert!(!same_law(
            &AlgebraicLaw::Absorbing { element: 5 },
            &AlgebraicLaw::LeftAbsorbing { element: 6 }
        ));
    }

    #[test]
    fn distinct_laws_remain_distinct() {
        assert!(!same_law(
            &AlgebraicLaw::Commutative,
            &AlgebraicLaw::Associative
        ));
    }
}