Assert a std::io::Read read_to_string() value is less than an expression.
use std::io::Read; let mut reader = "alfa".as_bytes(); let value = String::from("bravo"); assert_io_read_to_string_lt_expr!(reader, &value);
assert_io_read_to_string_lt_expr
assert_io_read_to_string_lt_expr_as_result
debug_assert_io_read_to_string_lt_expr