Macro assertables::assert_not_starts_with
source · macro_rules! assert_not_starts_with { ($a:expr, $b:expr $(,)?) => { ... }; ($a:expr, $b:expr, $($message:tt)+) => { ... }; }
Expand description
Assert an expression (such as a string) does not start with an expression (such as a string).
-
If true, return
()
. -
Otherwise, call
panic!
with a message and the values of the expressions with their debug representations.
Examples
// Return Ok
let a = "foogoo";
let b = "goo";
assert_not_starts_with!(a, b);
//-> ()
// Panic with error message
let result = panic::catch_unwind(|| {
let a = "foogoo";
let b = "foo";
assert_not_starts_with!(a, b);
//-> panic!
});
assert!(result.is_err());
let actual = result.unwrap_err().downcast::<String>().unwrap().to_string();
let expect = concat!(
"assertion failed: `assert_not_starts_with!(a, b)`\n",
" a label: `a`,\n",
" a debug: `\"foogoo\"`,\n",
" b label: `b`,\n",
" b debug: `\"foo\"`"
);
assert_eq!(actual, expect);