diff --git a/library/coretests/tests/cmp.rs b/library/coretests/tests/cmp.rs
index 55e35a4a7250e..3a980db3e2988 100644
--- a/library/coretests/tests/cmp.rs
+++ b/library/coretests/tests/cmp.rs
@@ -118,6 +118,13 @@ fn test_user_defined_eq() {
     assert!(SketchyNum { num: 25 } != SketchyNum { num: 57 });
 }
 
+#[test]
+fn test_clamp() {
+    assert_eq!((-3).clamp(-2, 1), -2);
+    assert_eq!(0.clamp(-2, 1), 0);
+    assert_eq!(2.clamp(-2, 1), 1);
+}
+
 #[test]
 fn ordering_const() {
     // test that the methods of `Ordering` are usable in a const context
diff --git a/library/coretests/tests/option.rs b/library/coretests/tests/option.rs
index fc0f82ad6bb38..0d497482868a4 100644
--- a/library/coretests/tests/option.rs
+++ b/library/coretests/tests/option.rs
@@ -248,6 +248,12 @@ fn test_unwrap_or_else() {
     */
 }
 
+#[test]
+fn test_unwrap_or_default() {
+    assert_eq!(Some(666u32).unwrap_or_default(), 666);
+    assert_eq!(None::<u32>.unwrap_or_default(), 0);
+}
+
 #[test]
 fn test_unwrap_unchecked() {
     assert_eq!(unsafe { Some(1).unwrap_unchecked() }, 1);
diff --git a/library/coretests/tests/result.rs b/library/coretests/tests/result.rs
index 39898d5dbb76e..1f7bfecd59ba4 100644
--- a/library/coretests/tests/result.rs
+++ b/library/coretests/tests/result.rs
@@ -44,6 +44,18 @@ fn test_or_else() {
     assert_eq!(op2().or_else(|e| Err::<isize, &'static str>(e)).unwrap_err(), "sadface");
 }
 
+#[test]
+fn test_map_or() {
+    assert_eq!(op1().map_or(667, |x| x), 666);
+    assert_eq!(op2().map_or(666, |_| panic!()), 666);
+}
+
+#[test]
+fn test_copied() {
+    assert!(Ok::<&isize, isize>(&1).copied() == Ok(1));
+    assert!(Err::<&isize, isize>(1).copied() == Err(1));
+}
+
 #[test]
 fn test_impl_map() {
     assert!(Ok::<isize, isize>(1).map(|x| x + 1) == Ok(2));