Macro assertables::assert_read_to_string_contains_as_result

macro_rules! assert_read_to_string_contains_as_result {
    ($a_reader:expr, $b_containee:expr $(,)?) => { ... };
}

Assert a std::io::Read read_to_string() contains a pattern.

• If true, return Result Ok(()).

• Otherwise, return Result Err with a diagnostic message.

Examples

use std::io::Read;
let mut reader = "hello".as_bytes();
let containee = "ell";
let x = assert_read_to_string_contains_as_result!(reader, containee);
//-> Ok(())
let actual = x.unwrap();
let expect = ();
assert_eq!(actual, expect);

let mut reader = "hello".as_bytes();
let containee = "xyz";
let x = assert_read_to_string_contains_as_result!(reader, containee);
//-> Err(…)
let actual = x.unwrap_err();
let expect = concat!(
    "assertion failed: `assert_read_to_string_contains!(left_reader, right_containee)`\n",
    "     left_reader label: `reader`,\n",
    "     left_reader debug: `[]`,\n",
    " right_containee label: `containee`,\n",
    " right_containee debug: `\"xyz\"`,\n",
    "                  left: `\"hello\"`,\n",
    "                 right: `\"xyz\"`"
);
assert_eq!(actual, expect);