diff --git a/src/map/slice.rs b/src/map/slice.rs
index e0835f61..c994f677 100644
--- a/src/map/slice.rs
+++ b/src/map/slice.rs
@@ -786,4 +786,37 @@ mod tests {
         assert_eq!(subslice.len(), 3);
         assert_eq!(subslice, &[(3, 9), (4, 16), (5, 25)]);
     }
+
+    #[test]
+    fn slice_split_at_checked() {
+        let map: IndexMap<i32, i32> = (0..4).map(|i| (i, i * i)).collect();
+        let slice = map.as_slice();
+
+        let (first, second) = slice.split_at_checked(1).unwrap();
+        assert_eq!(first, &[(0, 0)]);
+        assert_eq!(second, &[(1, 1), (2, 4), (3, 9)]);
+
+        let (first, second) = slice.split_at_checked(4).unwrap();
+        assert_eq!(first.len(), 4);
+        assert!(second.is_empty());
+
+        assert!(slice.split_at_checked(5).is_none());
+    }
+
+    #[test]
+    fn slice_split_at_mut_checked() {
+        let mut map: IndexMap<i32, i32> = (0..4).map(|i| (i, i * i)).collect();
+        let slice: &mut Slice<i32, i32> = map.as_mut_slice();
+
+        {
+            let (first, second) = slice.split_at_mut_checked(2).unwrap();
+            assert_eq!(first, &[(0, 0), (1, 1)]);
+            assert_eq!(second, &[(2, 4), (3, 9)]);
+            first[0] = 100;
+            second[0] = 200;
+        }
+        assert_eq!(slice, &[(0, 100), (1, 1), (2, 200), (3, 9)]);
+
+        assert!(slice.split_at_mut_checked(5).is_none());
+    }
 }
diff --git a/src/map/tests.rs b/src/map/tests.rs
index 5b7a174c..3c77edcd 100644
--- a/src/map/tests.rs
+++ b/src/map/tests.rs
@@ -606,6 +606,24 @@ fn get_index_mut2() {
     assert_eq!(map.get_index(0).unwrap().0, &8);
 }
 
+#[test]
+fn get_key_value_mut() {
+    let mut map: IndexMap<i32, i32> = IndexMap::new();
+    map.insert(1, 2);
+    map.insert(3, 4);
+
+    {
+        let (key, value) = map.get_key_value_mut(&3).unwrap();
+        assert_eq!(*key, 3);
+        assert_eq!(*value, 4);
+        *value = 7;
+    }
+    assert_eq!(map[&3], 7);
+    assert_eq!(map[&1], 2);
+
+    assert!(map.get_key_value_mut(&5).is_none());
+}
+
 #[test]
 fn shift_shift_remove_index() {
     let mut map: IndexMap<i32, i32> = IndexMap::new();
diff --git a/src/set/slice.rs b/src/set/slice.rs
index b0fda998..5dd9d6a1 100644
--- a/src/set/slice.rs
+++ b/src/set/slice.rs
@@ -426,4 +426,20 @@ mod tests {
             }
         }
     }
+
+    #[test]
+    fn slice_split_at_checked() {
+        let set: IndexSet<i32> = (0..4).collect();
+        let slice = set.as_slice();
+
+        let (first, second) = slice.split_at_checked(1).unwrap();
+        assert_eq!(first, &[0]);
+        assert_eq!(second, &[1, 2, 3]);
+
+        let (first, second) = slice.split_at_checked(4).unwrap();
+        assert_eq!(first.len(), 4);
+        assert!(second.is_empty());
+
+        assert!(slice.split_at_checked(5).is_none());
+    }
 }