diff --git a/test/parallel/test-assert.js b/test/parallel/test-assert.js
index 01945b223d67f8..c609244a8838f3 100644
--- a/test/parallel/test-assert.js
+++ b/test/parallel/test-assert.js
@@ -71,6 +71,21 @@ assert.throws(makeBlock(a.deepEqual, new Date(), new Date(2000, 3, 14)),
               a.AssertionError,
               'deepEqual(new Date(), new Date(2000, 3, 14))');
 
+assert.throws(makeBlock(
+  a.notDeepEqual,
+  new Date(2000, 3, 14),
+  new Date(2000, 3, 14)),
+  a.AssertionError,
+  'notDeepEqual(new Date(2000, 3, 14), new Date(2000, 3, 14))'
+);
+
+assert.doesNotThrow(makeBlock(
+  a.notDeepEqual,
+  new Date(),
+  new Date(2000, 3, 14)),
+  'notDeepEqual(new Date(), new Date(2000, 3, 14))'
+);
+
 // 7.3
 assert.doesNotThrow(makeBlock(a.deepEqual, /a/, /a/));
 assert.doesNotThrow(makeBlock(a.deepEqual, /a/g, /a/g));