#[macro_use]
pub mod approx_eq {
#[macro_export]
macro_rules! assert_approx_eq {
($x: expr, $y: expr) => {
let eps = 1e-6;
let (x, y): (f64, f64) = ($x, $y);
if x == 0. {
assert!(y.abs() < eps, "x = {}, y = {}", x, y);
} else if y == 0. {
assert!(x.abs() < eps, "x = {}, y = {}", x, y);
} else {
assert!(&x.signum() == &y.signum(), "x = {}, y = {}", x, y);
let (x, y): (f64, f64) = (x.abs(), y.abs());
assert!(
(&x - &y).abs() / [x, y].iter().cloned().fold(f64::NAN, f64::min) < eps,
"x = {}, y = {}",
x,
y
);
}
};
($x: expr, $y: expr, $e: expr) => {
let (x, y): (f64, f64) = ($x, $y);
if x == 0. {
assert!(y.abs() < $e, "x = {}, y = {}", x, y);
} else if y == 0. {
assert!(x.abs() < $e, "x = {}, y = {}", x, y);
} else {
assert!(&x.signum() == &y.signum(), "x = {}, y = {}", x, y);
let (x, y): (f64, f64) = (x.abs(), y.abs());
assert!(
(&x - &y).abs() / [x, y].iter().cloned().fold(f64::NAN, f64::min) < $e,
"x = {}, y = {}",
x,
y
);
}
};
}
}
#[test]
fn test_noeps() {
assert_approx_eq!(1., 1.);
assert_approx_eq!(1., 1.000001);
}
#[test]
fn test_witheps() {
assert_approx_eq!(1.0000000001, 1., 1e-5);
}
#[test]
fn test_nearzero() {
assert_approx_eq!(0., -0.0000000000245);
}
#[test]
fn test_zero() {
assert_approx_eq!(0., 0.);
}
#[test]
#[should_panic(expected = "assertion failed")]
fn test_invalid() {
assert_approx_eq!(1.0000000001, 1., 1e-10);
}
#[test]
#[should_panic(expected = "assertion failed")]
fn test_sign() {
assert_approx_eq!(1., -1.);
}