Macro assertables::assert_set_eq

source · 
macro_rules! assert_set_eq {
    ($a:expr, $b:expr $(,)?) => { ... };
    ($a:expr, $b:expr, $($message:tt)+) => { ... };
}
Expand description

Assert a set is equal to another.

  • If true, return ().

  • Otherwise, call panic! with a message and the values of the expressions with their debug representations.

§Examples

// Return Ok
let a = [1, 2];
let b = [2, 1];
assert_set_eq!(&a, &b);
//-> ()

// Panic with error message
let result = panic::catch_unwind(|| {
let a = [1, 2];
let b = [3, 4];
assert_set_eq!(&a, &b);
//-> panic!
});
assert!(result.is_err());
let actual = result.unwrap_err().downcast::<String>().unwrap().to_string();
let expect = concat!(
    "assertion failed: `assert_set_eq!(a_set, b_set)`\n",
    " a label: `&a`,\n",
    " a debug: `[1, 2]`,\n",
    " b label: `&b`,\n",
    " b debug: `[3, 4]`,\n",
    "       a: `{1, 2}`,\n",
    "       b: `{3, 4}`"
);
assert_eq!(actual, expect);

This implementation uses std::collections::BTreeSet to count items and sort them.

§Module macros