rust/tests/ui/stdlib-unit-tests/istr.rs

// run-pass

use std::string::String;

fn test_stack_assign() {
    let s: String = "a".to_string();
    println!("{}", s.clone());
    let t: String = "a".to_string();
    assert_eq!(s, t);
    let u: String = "b".to_string();
    assert!((s != u));
}

fn test_heap_lit() { "a big string".to_string(); }

fn test_heap_assign() {
    let s: String = "a big ol' string".to_string();
    let t: String = "a big ol' string".to_string();
    assert_eq!(s, t);
    let u: String = "a bad ol' string".to_string();
    assert!((s != u));
}

fn test_heap_log() {
    let s = "a big ol' string".to_string();
    println!("{}", s);
}

fn test_append() {
    let mut s = String::new();
    s.push_str("a");
    assert_eq!(s, "a");

    let mut s = String::from("a");
    s.push_str("b");
    println!("{}", s.clone());
    assert_eq!(s, "ab");

    let mut s = String::from("c");
    s.push_str("offee");
    assert_eq!(s, "coffee");

    s.push_str("&tea");
    assert_eq!(s, "coffee&tea");
}

pub fn main() {
    test_stack_assign();
    test_heap_lit();
    test_heap_assign();
    test_heap_log();
    test_append();
}