vendor/lazy_static-0.2.9/tests/test.rs

   1 #![cfg_attr(feature="nightly", feature(const_fn))]
   2
   3 #[macro_use]
   4 extern crate lazy_static;
   5 use std::collections::HashMap;
   6
   7 lazy_static! {
   8     /// Documentation!
   9     pub static ref NUMBER: u32 = times_two(3);
  10
  11     static ref ARRAY_BOXES: [Box<u32>; 3] = [Box::new(1), Box::new(2), Box::new(3)];
  12
  13     /// More documentation!
  14     #[allow(unused_variables)]
  15     #[derive(Copy, Clone, Debug)]
  16     pub static ref STRING: String = "hello".to_string();
  17
  18     static ref HASHMAP: HashMap<u32, &'static str> = {
  19         let mut m = HashMap::new();
  20         m.insert(0, "abc");
  21         m.insert(1, "def");
  22         m.insert(2, "ghi");
  23         m
  24     };
  25
  26     // This should not compile if the unsafe is removed.
  27     static ref UNSAFE: u32 = unsafe {
  28         std::mem::transmute::<i32, u32>(-1)
  29     };
  30
  31     // This *should* triggger warn(dead_code) by design.
  32     static ref UNUSED: () = ();
  33
  34 }
  35
  36 lazy_static! {
  37     static ref S1: &'static str = "a";
  38     static ref S2: &'static str = "b";
  39 }
  40 lazy_static! {
  41     static ref S3: String = [*S1, *S2].join("");
  42 }
  43
  44 #[test]
  45 fn s3() {
  46     assert_eq!(&*S3, "ab");
  47 }
  48
  49 fn times_two(n: u32) -> u32 {
  50     n * 2
  51 }
  52
  53 #[test]
  54 fn test_basic() {
  55     assert_eq!(&**STRING, "hello");
  56     assert_eq!(*NUMBER, 6);
  57     assert!(HASHMAP.get(&1).is_some());
  58     assert!(HASHMAP.get(&3).is_none());
  59     assert_eq!(&*ARRAY_BOXES, &[Box::new(1), Box::new(2), Box::new(3)]);
  60     assert_eq!(*UNSAFE, std::u32::MAX);
  61 }
  62
  63 #[test]
  64 fn test_repeat() {
  65     assert_eq!(*NUMBER, 6);
  66     assert_eq!(*NUMBER, 6);
  67     assert_eq!(*NUMBER, 6);
  68 }
  69
  70 #[test]
  71 fn test_meta() {
  72     // this would not compile if STRING were not marked #[derive(Copy, Clone)]
  73     let copy_of_string = STRING;
  74     // just to make sure it was copied
  75     assert!(&STRING as *const _ != &copy_of_string as *const _);
  76
  77     // this would not compile if STRING were not marked #[derive(Debug)]
  78     assert_eq!(format!("{:?}", STRING), "STRING { __private_field: () }".to_string());
  79 }
  80
  81 mod visibility {
  82     lazy_static! {
  83         pub static ref FOO: Box<u32> = Box::new(0);
  84         static ref BAR: Box<u32> = Box::new(98);
  85     }
  86
  87     #[test]
  88     fn sub_test() {
  89         assert_eq!(**FOO, 0);
  90         assert_eq!(**BAR, 98);
  91     }
  92 }
  93
  94 #[test]
  95 fn test_visibility() {
  96     assert_eq!(*visibility::FOO, Box::new(0));
  97 }
  98
  99 // This should not cause a warning about a missing Copy implementation
 100 lazy_static! {
 101     pub static ref VAR: i32 = { 0 };
 102 }
 103
 104 #[derive(Copy, Clone, Debug, PartialEq)]
 105 struct X;
 106 struct Once(X);
 107 const ONCE_INIT: Once = Once(X);
 108 static DATA: X = X;
 109 static ONCE: X = X;
 110 fn require_sync() -> X { X }
 111 fn transmute() -> X { X }
 112 fn __static_ref_initialize() -> X { X }
 113 fn test(_: Vec<X>) -> X { X }
 114
 115 // All these names should not be shadowed
 116 lazy_static! {
 117     static ref ITEM_NAME_TEST: X = {
 118         test(vec![X, Once(X).0, ONCE_INIT.0, DATA, ONCE,
 119                   require_sync(), transmute(),
 120                   // Except this, which will sadly be shadowed by internals:
 121                   // __static_ref_initialize()
 122                   ])
 123     };
 124 }
 125
 126 #[test]
 127 fn item_name_shadowing() {
 128     assert_eq!(*ITEM_NAME_TEST, X);
 129 }
 130
 131 use std::sync::atomic::AtomicBool;
 132 use std::sync::atomic::ATOMIC_BOOL_INIT;
 133 use std::sync::atomic::Ordering::SeqCst;
 134
 135 static PRE_INIT_FLAG: AtomicBool = ATOMIC_BOOL_INIT;
 136
 137 lazy_static! {
 138     static ref PRE_INIT: () = {
 139         PRE_INIT_FLAG.store(true, SeqCst);
 140         ()
 141     };
 142 }
 143
 144 #[test]
 145 fn pre_init() {
 146     assert_eq!(PRE_INIT_FLAG.load(SeqCst), false);
 147     lazy_static::initialize(&PRE_INIT);
 148     assert_eq!(PRE_INIT_FLAG.load(SeqCst), true);
 149 }
 150
 151 lazy_static! {
 152     static ref LIFETIME_NAME: for<'a> fn(&'a u8) = { fn f(_: &u8) {} f };
 153 }
 154
 155 #[test]
 156 fn lifetime_name() {
 157     let _ = LIFETIME_NAME;
 158 }