macro_rules! assert_read_to_string_lt { ($a_reader:expr, $b_reader:expr $(,)?) => { ... }; ($a_reader:expr, $b_reader:expr, $($message:tt)+) => { ... }; }
Expand description
Assert a std::io::Read read_to_string() value is less than another.
-
If true, return
()
. -
Otherwise, call
panic!
with a message and the values of the expressions with their debug representations.
Examples
use std::io::Read;
// Return Ok
let mut a = "alpha".as_bytes();
let mut b = "bravo".as_bytes();
assert_read_to_string_lt!(a, b);
//-> ()
// Panic with error message
let result = panic::catch_unwind(|| {
let mut a = "bravo".as_bytes();
let mut b = "alpha".as_bytes();
assert_read_to_string_lt!(a, b);
//-> panic!
});
assert!(result.is_err());
let actual = result.unwrap_err().downcast::<String>().unwrap().to_string();
let expect = concat!(
"assertion failed: `assert_read_to_string_lt!(left_reader, right_reader)`\n",
" left_reader label: `a`,\n",
" left_reader debug: `[]`,\n",
" right_reader label: `b`,\n",
" right_reader debug: `[]`,\n",
" left: `\"bravo\"`,\n",
" right: `\"alpha\"`"
);
assert_eq!(actual, expect);