#[test]
fn fma_negative_zero() {
    let tiny = 1e-300;
    assert!(libm::fma(tiny, tiny, 0.0).is_sign_positive());
    // TODO: RUSTPYTHON incompatibility between fma inside libc and musl
    // assert!(libm::fma(tiny, -tiny, 0.0).is_sign_negative());
    assert!(libm::fma(-tiny, -tiny, 0.0).is_sign_positive());
    // TODO: RUSTPYTHON incompatibility between fma inside libc and musl
    // assert!(libm::fma(-tiny, tiny, 0.0).is_sign_negative());
    assert!(libm::fma(tiny, tiny, -0.0).is_sign_positive());
    assert!(libm::fma(tiny, -tiny, -0.0).is_sign_negative());
    assert!(libm::fma(-tiny, -tiny, -0.0).is_sign_positive());
    assert!(libm::fma(-tiny, tiny, -0.0).is_sign_negative());
}