#[test]
fn bmi_works() {
    let bmi = medicallib_rust::calculate_bmi(70.0, 1.75).unwrap();
    assert!((bmi - 22.857145).abs() < 1e-5);
    let cls = medicallib_rust::classify_bmi(bmi);
    assert_eq!(cls, medicallib_rust::BMIClassification::Normal);
}