diff --git a/aspclassiccompiler/VBScript/Runtime/IAssert.cs b/aspclassiccompiler/VBScript/Runtime/IAssert.cs
index ad7063a..74e8672 100644
--- a/aspclassiccompiler/VBScript/Runtime/IAssert.cs
+++ b/aspclassiccompiler/VBScript/Runtime/IAssert.cs
@@ -1,16 +1,30 @@
 using System;
 using System.Collections.Generic;
 using System.Text;
-using System.Runtime.InteropServices;
 
 namespace Dlrsoft.VBScript.Runtime
 {
     public interface IAssert
     {
+
+        void AreEqual(object expected, object actual);
+
         void AreEqual(object expected, object actual, string message);
+
+        void AreNotEqual(object notExpected, object actual);
+
         void AreNotEqual(object notExpected, object actual, string message);
+
+        void Fail();
+
         void Fail(string message);
+
+        void IsFalse(bool condition);
+
         void IsFalse(bool condition, string message);
+
+        void IsTrue(bool condition);
+
         void IsTrue(bool condition, string message);
     }
 }
diff --git a/aspclassiccompiler/VBScriptTest/NunitAssert.cs b/aspclassiccompiler/VBScriptTest/NunitAssert.cs
index f2cbb64..a74b8de 100644
--- a/aspclassiccompiler/VBScriptTest/NunitAssert.cs
+++ b/aspclassiccompiler/VBScriptTest/NunitAssert.cs
@@ -12,31 +12,107 @@ namespace Dlrsoft.VBScriptTest
     {
         #region IAssert Members
 
+        [ComVisible(false)]
         public void AreEqual(object expected, object actual, string message)
         {
             Assert.AreEqual(expected, actual, message);
         }
 
+        [ComVisible(false)]
         public void AreNotEqual(object notExpected, object actual, string message)
         {
             Assert.AreNotEqual(notExpected, actual, message);
         }
 
+        [ComVisible(false)]
         public void Fail(string message)
         {
             Assert.Fail(message);
         }
 
+        [ComVisible(false)]
         public void IsFalse(bool condition, string message)
         {
             Assert.IsFalse(condition, message);
         }
 
+        [ComVisible(false)]
         public void IsTrue(bool condition, string message)
         {
             Assert.IsTrue(condition, message);
         }
 
+        [ComVisible(false)]
+        public void AreEqual(object expected, object actual)
+        {
+            Assert.AreEqual(expected, actual);
+        }
+
+        [ComVisible(false)]
+        public void AreEqual(object expected, object actual, object message)
+        {
+            if (message == null || message == System.Type.Missing)
+                AreEqual(expected, actual);
+            else
+                AreEqual(expected, actual, message.ToString());
+        }
+
+        [ComVisible(false)]
+        public void AreNotEqual(object notExpected, object actual)
+        {
+            Assert.AreNotEqual(notExpected, actual);
+        }
+
+        public void AreNotEqual(object notExpected, object actual, object message)
+        {
+            if (message == null || message == System.Type.Missing)
+                AreNotEqual(notExpected, actual);
+            else
+                AreNotEqual(notExpected, actual, message.ToString());
+        }
+
+        [ComVisible(false)]
+        public void Fail()
+        {
+            Assert.Fail();
+        }
+
+        public void Fail(object message)
+        {
+            if (message == null || message == System.Type.Missing)
+                Fail();
+            else
+                Fail(message.ToString());
+        }
+
+        [ComVisible(false)]
+        public void IsFalse(bool condition)
+        {
+            Assert.IsFalse(condition);
+        }
+
+        public void IsFalse(bool condition, object message)
+        {
+            if (message == null || message == System.Type.Missing)
+                IsFalse(condition);
+            else
+                IsFalse(condition, message.ToString());
+        }
+
+        [ComVisible(false)]
+        public void IsTrue(bool condition)
+        {
+            Assert.IsTrue(condition);
+        }
+
+        public void IsTrue(bool condition, object message)
+        {
+            if (message == null || message == System.Type.Missing)
+                IsTrue(condition);
+            else
+                IsTrue(condition, message.ToString());
+        }
+
         #endregion
     }
 }