Add Bound tests

src/libcore/tests/ops.rs

@@ -82,3 +82,18 @@ fn test_range_is_empty() {
     assert!( (NAN ..= EPSILON).is_empty());
     assert!( (NAN ..= NAN).is_empty());
 }
+
+#[test]
+fn test_bound_cloned_unbounded() {
+    assert_eq!(Bound::<&u32>::Unbounded.cloned(), Bound::Unbounded);
+}
+
+#[test]
+fn test_bound_cloned_included() {
+    assert_eq!(Bound::Included(&3).cloned(), Bound::Included(3));
+}
+
+#[test]
+fn test_bound_cloned_excluded() {
+    assert_eq!(Bound::Excluded(&3).cloned(), Bound::Excluded(3));
+}