Macro assertables::assert_io_read_to_string_matches

source · 
macro_rules! assert_io_read_to_string_matches {
    ($a_reader:expr, $b_matcher:expr $(,)?) => { ... };
    ($a_reader:expr, $b_matcher:expr, $($message:tt)+) => { ... };
}
Expand description

Assert a std::io::Read read_to_string() is a match to a regex.

  • If true, return ().

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

§Examples

use std::io::Read;
use regex::Regex;

// Return Ok
let mut reader = "hello".as_bytes();
let matcher = Regex::new(r"ell").unwrap();
assert_io_read_to_string_matches!(reader, matcher);
//-> ()

// Panic with error message
let result = panic::catch_unwind(|| {
let mut reader = "hello".as_bytes();
let matcher = Regex::new(r"zzz").unwrap();
assert_io_read_to_string_matches!(reader, matcher);
//-> panic!
});
assert!(result.is_err());
let actual = result.unwrap_err().downcast::<String>().unwrap().to_string();
let expect = concat!(
    "assertion failed: `assert_io_read_to_string_matches!(left_reader, right_matcher)`\n",
    "   left_reader label: `reader`,\n",
    "   left_reader debug: `[]`,\n",
    " right_matcher label: `matcher`,\n",
    " right_matcher debug: `Regex(\"zzz\")`,\n",
    "                left: `\"hello\"`,\n",
    "               right: `Regex(\"zzz\")`"
);
assert_eq!(actual, expect);

§Module macros