vitri 0.2.0

CNF preprocessing and vtree construction (variable trees) for circuit compilation and model counting: preprocesses a DIMACS CNF, records the arithmetic to lift a model count back to the original, and builds a good vtree for it — for any d-DNNF/SDD/TDD compiler, or any model counter that takes a vtree.
Documentation 
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//! `PortfolioKnobs::ranker`: the caller's switch over the aggregate ranker.

use crate::component::build_vtree;
use crate::config::RunConfig;
use crate::decompose::portfolio::PortfolioKnobs;
use crate::decompose::{PairwiseWeighting, SelectionCtx};
use crate::tests::common::wide_component;

#[test]
fn the_ranker_follows_the_environment_by_default() {
    assert!(PortfolioKnobs::default().ranker);
}

#[test]
fn a_caller_that_turned_the_ranker_off_keeps_it_off_through_the_env_defaults() {
    let knobs = PortfolioKnobs {
        ranker: false,
        ..PortfolioKnobs::default()
    }
    .with_env_defaults()
    .expect("no portfolio variable is set in the test environment");
    assert!(!knobs.ranker);
}

#[test]
fn a_build_with_the_ranker_off_still_selects_a_candidate() {
    let ctx = SelectionCtx {
        portfolio: PortfolioKnobs {
            ranker: false,
            ..PortfolioKnobs::default()
        },
        ..SelectionCtx::plain()
    };
    let build = build_vtree(&wide_component(), &RunConfig::default(), &ctx)
        .expect("the wide component builds");
    assert!(build.selections[0].winning_spec.is_some());
}

#[test]
fn pairwise_weighting_defaults_to_candidates_and_preserves_caller_choice() {
    assert_eq!(
        PortfolioKnobs::default().pairwise_weighting,
        PairwiseWeighting::Candidate
    );
    let knobs = PortfolioKnobs {
        pairwise_weighting: PairwiseWeighting::Family,
        ..PortfolioKnobs::default()
    }
    .with_env_defaults()
    .expect("portfolio defaults are valid");
    assert_eq!(knobs.pairwise_weighting, PairwiseWeighting::Family);
}