diff --git a/tests/Neo.UnitTests/Persistence/UT_DataCache.cs b/tests/Neo.UnitTests/Persistence/UT_DataCache.cs
index 1778aa3b92..45a04aec07 100644
--- a/tests/Neo.UnitTests/Persistence/UT_DataCache.cs
+++ b/tests/Neo.UnitTests/Persistence/UT_DataCache.cs
@@ -182,12 +182,12 @@ public void TestFind()
             items = myDataCache.Find(new byte[] { });
             items.Count().Should().Be(4);
 
-            // null and empty with the backwards direction -> miserably fails.
-            // Action action = () => myDataCache.Find(null, SeekDirection.Backward);
-            // action.Should().Throw<ArgumentException>();
+            // null and empty with the backwards direction start from the last key
+            items = myDataCache.Find(null, SeekDirection.Backward);
+            // no exception, and results check will be added later.
 
-            // action = () => myDataCache.Find(new byte[] { }, SeekDirection.Backward);
-            // action.Should().Throw<ArgumentException>();
+            items = myDataCache.Find(new byte[] { }, SeekDirection.Backward);
+            // no exception, and results check will be added later.
 
             items = myDataCache.Find(k1, SeekDirection.Backward);
             key1.Should().Be(items.ElementAt(0).Key);
@@ -439,7 +439,7 @@ public void TestFindEmptyPrefix()
             items = dataCache.Find([0xff, 0xff, 0xff, 0xff, 0xff], SeekDirection.Backward).ToArray();
             items.Length.Should().Be(1);
             items[0].Key.ToArray().Should().BeEquivalentTo(k3.ToArray());
-        
+
             items = dataCache.Find([0xff], SeekDirection.Backward).ToArray();
             items.Length.Should().Be(3);
             items[0].Key.ToArray().Should().BeEquivalentTo(k3.ToArray());