#[test]
fn fill_placeholder() {
const TEXT10: &str = "1234567890";
const TEXT21: &str = "1234567890_1234567890";
const TEXT27: &str = "1234567890_1234567890_12345";
let sb = CharacterShallow::new(21, 5);
assert_eq!(sb.build_cow(TEXT10), TEXT10);
assert_eq!(sb.build_cow(TEXT21), "1234567890_1234567890"); assert_eq!(sb.build_cow(TEXT27), "123456789 <...> 12345");
let sb = sb.with_shallow_text("..."); assert_eq!(sb.build_cow(TEXT27), "1234567890_12...12345");
let sb = sb.with_end_reserved(0); assert_eq!(sb.build_cow(TEXT27), "1234567890_1234567...");
}