Macro assertables::assert_read_to_string_matches_as_result

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

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

  • If true, return Result Ok(()).

  • Otherwise, return Result Err with a diagnostic message.

Examples

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

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

let mut reader = "hello".as_bytes();
let matcher = Regex::new(r"xyz").unwrap();
let x = assert_read_to_string_matches_as_result!(reader, matcher);
//-> Err(…)
assert!(x.is_err());
let actual = x.unwrap_err();
let expect = concat!(
    "assertion failed: `assert_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: `xyz`,\n",
    "                left: `\"hello\"`,\n",
    "               right: `xyz`"
);
assert_eq!(actual, expect);