Macro assert_variable_eq 

macro_rules! assert_variable_eq {
    ($x:expr, $y:expr) => { ... };
    ($x:expr, $y:expr, comp = exact) => { ... };
    ($x:expr, $y:expr, comp = abs, tol = $tol:expr) => { ... };
    ($x:expr, $y:expr, comp = ulp, tol = $tol:expr) => { ... };
    ($x:expr, $y:expr, comp = float) => { ... };
    ($x:expr, $y:expr, comp = float, $($key:ident = $val:expr),+) => { ... };
}

Variable wrapper around assert_matrix_eq

This compares two variables using ominus