diff --git a/src/Neo.SmartContract.Testing/Extensions/TestExtensions.cs b/src/Neo.SmartContract.Testing/Extensions/TestExtensions.cs
index a95043eee..ee06d8edd 100644
--- a/src/Neo.SmartContract.Testing/Extensions/TestExtensions.cs
+++ b/src/Neo.SmartContract.Testing/Extensions/TestExtensions.cs
@@ -84,8 +84,8 @@ _ when typeof(IInteroperable).IsAssignableFrom(type) => CreateInteroperable(stac
 
                 _ when stackItem is VM.Types.Array ar => type switch
                 {
-                    _ when type == typeof(IList<object>) => new List<object>(ar.SubItems), // SubItems in StackItem type
-                    _ when type == typeof(List<object>) => new List<object>(ar.SubItems), // SubItems in StackItem type
+                    _ when type == typeof(IList<object>) => new List<object>(ar.SubItems.Select(ConvertToBaseValue)), // SubItems in StackItem type except bool, buffer and int
+                    _ when type == typeof(List<object>) => new List<object>(ar.SubItems.Select(ConvertToBaseValue)), // SubItems in StackItem type except bool, buffer and int
                     _ when type.IsArray => CreateTypeArray(ar.SubItems, type.GetElementType()!),
                     _ when type.IsClass => CreateObject(ar.SubItems, type),
                     _ when type.IsValueType => CreateValueType(ar.SubItems, type),
@@ -93,8 +93,8 @@ _ when typeof(IInteroperable).IsAssignableFrom(type) => CreateInteroperable(stac
                 },
                 _ when stackItem is Map mp => type switch
                 {
-                    _ when type == typeof(IDictionary<object, object>) => ToDictionary(mp), // SubItems in StackItem type
-                    _ when type == typeof(Dictionary<object, object>) => ToDictionary(mp), // SubItems in StackItem type
+                    _ when type == typeof(IDictionary<object, object>) => ToDictionary(mp), // SubItems in StackItem type except bool, buffer and int
+                    _ when type == typeof(Dictionary<object, object>) => ToDictionary(mp), // SubItems in StackItem type except bool, buffer and int
                     _ => throw new FormatException($"Impossible to convert {stackItem} to {type}"),
                 },
 
@@ -102,6 +102,17 @@ _ when typeof(IInteroperable).IsAssignableFrom(type) => CreateInteroperable(stac
             };
         }
 
+        private static object ConvertToBaseValue(StackItem u)
+        {
+            // if (u is Null) return null; // it require nullable return
+            if (u is Integer i) return i.GetInteger();
+            if (u is VM.Types.Boolean b) return b.GetBoolean();
+            if (u is VM.Types.Buffer bf) return bf.GetSpan().ToArray();
+            // if (u is ByteString s) return s.GetString(); // it could be a byte[]
+
+            return u;
+        }
+
         private static object CreateObject(IEnumerable<StackItem> subItems, Type type)
         {
             var index = 0;
@@ -163,7 +174,7 @@ private static IDictionary<object, object> ToDictionary(Map map)
 
             foreach (var entry in map)
             {
-                dictionary.Add(entry.Key, entry.Value);
+                dictionary.Add(ConvertToBaseValue(entry.Key), ConvertToBaseValue(entry.Value));
             }
 
             return dictionary;
@@ -195,7 +206,7 @@ private static object CreateValueType(IEnumerable<StackItem> objects, Type value
             return value;
         }
 
-        private static object CreateTypeArray(IEnumerable<StackItem> objects, Type elementType)
+        private static System.Array CreateTypeArray(IEnumerable<StackItem> objects, Type elementType)
         {
             var obj = objects.ToArray();
 
@@ -214,7 +225,7 @@ private static object CreateTypeArray(IEnumerable<StackItem> objects, Type eleme
             return obj;
         }
 
-        private static object CreateInteroperable(StackItem stackItem, Type type)
+        private static IInteroperable CreateInteroperable(StackItem stackItem, Type type)
         {
             var interoperable = (IInteroperable)Activator.CreateInstance(type)!;
             interoperable.FromStackItem(stackItem);
diff --git a/tests/Neo.Compiler.CSharp.UnitTests/UnitTest_Lambda.cs b/tests/Neo.Compiler.CSharp.UnitTests/UnitTest_Lambda.cs
index af00c451b..2e137f784 100644
--- a/tests/Neo.Compiler.CSharp.UnitTests/UnitTest_Lambda.cs
+++ b/tests/Neo.Compiler.CSharp.UnitTests/UnitTest_Lambda.cs
@@ -1,8 +1,8 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Neo.SmartContract.Testing;
 using Neo.SmartContract.Testing.TestingStandards;
-using Neo.VM.Types;
 using System.Collections.Generic;
+using System.Numerics;
 
 namespace Neo.Compiler.CSharp.UnitTests
 {
@@ -67,9 +67,9 @@ public void Test_WhereGreaterThanZero()
 
             result = Contract.WhereGreaterThanZero(array);
             Assert.AreEqual(3, result!.Count);
-            Assert.AreEqual(1, (result[0] as Integer)!.GetInteger());
-            Assert.AreEqual(100, (result[1] as Integer)!.GetInteger());
-            Assert.AreEqual(56, (result[2] as Integer)!.GetInteger());
+            Assert.AreEqual(new BigInteger(1), result[0]);
+            Assert.AreEqual(new BigInteger(100), result[1]);
+            Assert.AreEqual(new BigInteger(56), result[2]);
         }
 
         [TestMethod]
@@ -83,7 +83,7 @@ public void Test_ForEachVar()
             };
             var result = Contract.ForEachVar(array);
             Assert.AreEqual(array.Count, result!.Count);
-            Assert.AreEqual(-100, (result[0] as Integer)!.GetInteger());
+            Assert.AreEqual(new BigInteger(-100), result[0]);
         }
 
         [TestMethod]
@@ -97,7 +97,7 @@ public void Test_ForVar()
             };
             var result = Contract.ForVar(array);
             Assert.AreEqual(array.Count, result!.Count);
-            Assert.AreEqual(-100, (result[0] as Integer)!.GetInteger());
+            Assert.AreEqual(new BigInteger(-100), result[0]);
         }
 
         [TestMethod]
diff --git a/tests/Neo.SmartContract.Framework.UnitTests/ListTest.cs b/tests/Neo.SmartContract.Framework.UnitTests/ListTest.cs
index 44a08af72..bf45f233a 100644
--- a/tests/Neo.SmartContract.Framework.UnitTests/ListTest.cs
+++ b/tests/Neo.SmartContract.Framework.UnitTests/ListTest.cs
@@ -1,3 +1,4 @@
+using System.Numerics;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Neo.Json;
 using Neo.SmartContract.Testing;
@@ -65,8 +66,7 @@ public void TestArrayConvert()
             Assert.AreEqual(4, array.Count);
             for (int i = 0; i < 4; i++)
             {
-                Assert.IsTrue(array[i] is Integer);
-                Assert.AreEqual(i, ((Integer)array[i]).GetInteger());
+                Assert.AreEqual(new BigInteger(i), array[i]);
             }
         }