diff --git a/Supernova.Enum.Generators/EnumSourceGenerator.cs b/Supernova.Enum.Generators/EnumSourceGenerator.cs
index b6de88b..a567f3e 100644
--- a/Supernova.Enum.Generators/EnumSourceGenerator.cs
+++ b/Supernova.Enum.Generators/EnumSourceGenerator.cs
@@ -106,7 +106,7 @@ public sealed class {SourceGeneratorHelper.AttributeName}Attribute : Attribute
 using System.Collections.Immutable;
 namespace {SourceGeneratorHelper.NameSpace}
 {{
-    public static class {symbol.Name}EnumExtensions
+    {symbol.DeclaredAccessibility.ToString("G").ToLower()} static class {symbol.Name}EnumExtensions
     {{");
 
             //DisplayNames Dictionary
diff --git a/test/UnitTests/InternalEnumGeneratorTest.cs b/test/UnitTests/InternalEnumGeneratorTest.cs
new file mode 100644
index 0000000..84a5a5a
--- /dev/null
+++ b/test/UnitTests/InternalEnumGeneratorTest.cs
@@ -0,0 +1,181 @@
+using EnumFastToStringGenerated;
+using FluentAssertions;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace UnitTests;
+
+[EnumGenerator]
+internal enum InternalUserTypeTest
+{
+    [Display(Name = "مرد", Description = "Descمرد")] Men = 3,
+
+    [Display(Name = "زن", Description = "Descزن")] Women = 4,
+
+    //[Display(Name = "نامشخص")]
+    None
+}
+
+[TestClass]
+public class InternalEnumGeneratorTest
+{
+    [TestMethod]
+    public void TestEnumDefined()
+    {
+        var defined = InternalUserTypeTestEnumExtensions.IsDefinedFast("Men");
+
+        Assert.IsTrue(defined);
+    }
+
+    [TestMethod]
+    public void TestEnumDefined_Undefined()
+    {
+        var defined = InternalUserTypeTestEnumExtensions.IsDefinedFast("DoesNotExist");
+
+        Assert.IsFalse(defined);
+    }
+
+    [TestMethod]
+    public void TestEnumToString()
+    {
+        var menString = InternalUserTypeTest.Men.ToStringFast();
+
+        Assert.AreEqual("Men", menString);
+    }
+
+    [TestMethod]
+    public void TestEnumToString_Undefined()
+    {
+        var action = () => GetUndefinedEnumValue().ToStringFast();
+
+        action.Should().Throw<ArgumentOutOfRangeException>();
+    }
+
+    [TestMethod]
+    public void TestEnumToString_Undefined_DefaultValue()
+    {
+        var value = GetUndefinedEnumValue().ToStringFast("DefaultValue");
+
+        value.Should().Be("DefaultValue");
+    }
+    
+    [TestMethod]
+    public void TestEnumToDescription()
+    {
+        var menString = InternalUserTypeTest.Men.ToDescriptionFast();
+
+        menString.Should().Be("Descمرد");
+    }
+
+    [TestMethod]
+    public void TestEnumToDescription_Undefined()
+    {
+        var action = () => GetUndefinedEnumValue().ToDescriptionFast();
+
+        action.Should().Throw<ArgumentOutOfRangeException>();
+    }
+
+    [TestMethod]
+    public void TestEnumToDescription_Undefined_DefaultValue()
+    {
+        var value = GetUndefinedEnumValue().ToDescriptionFast("DefaultValue");
+
+        value.Should().Be("DefaultValue");
+    }
+
+    [TestMethod]
+    public void TestEnumToDisplay()
+    {
+        var menString = InternalUserTypeTest.Men.ToDisplayFast();
+
+        Assert.AreEqual("مرد", menString);
+    }
+
+    [TestMethod]
+    public void TestEnumToDisplayNone()
+    {
+        var menString = InternalUserTypeTest.None.ToDisplayFast();
+
+        Assert.AreEqual("None", menString);
+    }
+
+    [TestMethod]
+    public void TestEnumToDisplay_Undefined()
+    {
+        var action = () => GetUndefinedEnumValue().ToDisplayFast();
+
+        action.Should().Throw<ArgumentOutOfRangeException>();
+    }
+
+    [TestMethod]
+    public void TestEnumToDisplay_Undefined_DefaultValue()
+    {
+        var value = GetUndefinedEnumValue().ToDisplayFast("DefaultValue");
+
+        value.Should().Be("DefaultValue");
+    }
+
+    [TestMethod]
+    public void TestEnumGetNames()
+    {
+        var names = InternalUserTypeTestEnumExtensions.GetNamesFast();
+
+        Assert.IsNotNull(names);
+        names.Should().NotBeEmpty()
+            .And.HaveCount(3)
+            .And.ContainInOrder(nameof(InternalUserTypeTest.Men), nameof(InternalUserTypeTest.Women), nameof(InternalUserTypeTest.None))
+            .And.ContainItemsAssignableTo<string>();
+    }
+
+    [TestMethod]
+    public void TestEnumDisplayNamesDictionary()
+    {
+        var names = InternalUserTypeTestEnumExtensions.DisplayNamesDictionary;
+        Assert.IsNotNull(names);
+        names.Should().NotBeEmpty()
+            .And.HaveCount(3)
+            .And.ContainInOrder(
+                new KeyValuePair<InternalUserTypeTest, string>(InternalUserTypeTest.Men, "مرد"),
+                new KeyValuePair<InternalUserTypeTest, string>(InternalUserTypeTest.Women, "زن"),
+                new KeyValuePair<InternalUserTypeTest, string>(InternalUserTypeTest.None, "None")
+            );
+    }
+    
+    [TestMethod]
+    public void TestEnumDisplayDescriptionsDictionary()
+    {
+        var names = InternalUserTypeTestEnumExtensions.DisplayDescriptionsDictionary;
+        Assert.IsNotNull(names);
+        names.Should().NotBeEmpty()
+            .And.HaveCount(3)
+            .And.ContainInOrder(
+                new KeyValuePair<InternalUserTypeTest, string>(InternalUserTypeTest.Men, "Descمرد"),
+                new KeyValuePair<InternalUserTypeTest, string>(InternalUserTypeTest.Women, "Descزن"),
+                new KeyValuePair<InternalUserTypeTest, string>(InternalUserTypeTest.None, "None")
+            );
+    }
+
+    [TestMethod]
+    public void TestEnumGetValues()
+    {
+        var values = InternalUserTypeTestEnumExtensions.GetValuesFast();
+
+        Assert.IsNotNull(values);
+        values.Should().NotBeEmpty()
+            .And.HaveCount(3)
+            .And.ContainInOrder(InternalUserTypeTest.Men, InternalUserTypeTest.Women, InternalUserTypeTest.None)
+            .And.ContainItemsAssignableTo<InternalUserTypeTest>();
+    }
+
+    [TestMethod]
+    public void TestEnumGetLength()
+    {
+        var length = InternalUserTypeTestEnumExtensions.GetLengthFast();
+
+        Assert.AreEqual(Enum.GetValues<InternalUserTypeTest>().Length, length);
+    }
+
+    private InternalUserTypeTest GetUndefinedEnumValue() => (InternalUserTypeTest)(-1);
+}