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

```rust

use std::any::Any;

use assertpanic::assertpanic;

let : Box = assertpanic!(panic!("at the Disco"));

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

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

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

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