Add tests for Option::copied()

Author: LunaBorowska

src/libcore/tests/lib.rs

@@ -10,6 +10,7 @@
 
 #![feature(box_syntax)]
 #![feature(cell_update)]
+#![feature(copied)]
 #![feature(core_private_bignum)]
 #![feature(core_private_diy_float)]
 #![feature(dec2flt)]

src/libcore/tests/option.rs

@@ -248,6 +248,27 @@ fn test_collect() {
     assert!(v == None);
 }
 
+#[test]
+fn test_copied() {
+    let val = 1;
+    let val_ref = &val;
+    let opt_none: Option<&'static u32> = None;
+    let opt_ref = Some(&val);
+    let opt_ref_ref = Some(&val_ref);
+
+    // None works
+    assert_eq!(opt_none.clone(), None);
+    assert_eq!(opt_none.copied(), None);
+
+    // Immutable ref works
+    assert_eq!(opt_ref.clone(), Some(&val));
+    assert_eq!(opt_ref.copied(), Some(1));
+
+    // Double Immutable ref works
+    assert_eq!(opt_ref_ref.clone(), Some(&val_ref));
+    assert_eq!(opt_ref_ref.clone().copied(), Some(&val));
+    assert_eq!(opt_ref_ref.copied().copied(), Some(1));
+}
 
 #[test]
 fn test_cloned() {