assert-panic

This library provides a macro that asserts that a panic happens, and optionally what (kind of) panic happens.

The simplest version gives you the panic as boxed Any.

Example

# use std::any::Any;
use assert_panic::assert_panic;

let _: Box<dyn Any + Send + 'static> =
    assert_panic!(panic!("at the Disco"));

assert_panic!(panic!("at the Disco"), &str);

assert_panic!(
    { assert_panic!({}); },
    String,
    starts with "assert_panic! argument did not panic:",
);

assert_panic!(
    assert_panic!(panic!("found"), &str, starts with "expected"),
    String,
    "Expected a panic starting with \"expected\" but found \"found\"",
);

assert_panic!(
    assert_panic!(panic!(1usize), usize, 2usize),
    String,
    "Expected 2 but found 1",
);