diff --git a/dotnet/src/Plugins/Plugins.UnitTests/Core/TextPluginTests.cs b/dotnet/src/Plugins/Plugins.UnitTests/Core/TextPluginTests.cs
index e162750e2cf8..980d9ffea814 100644
--- a/dotnet/src/Plugins/Plugins.UnitTests/Core/TextPluginTests.cs
+++ b/dotnet/src/Plugins/Plugins.UnitTests/Core/TextPluginTests.cs
@@ -1,5 +1,6 @@
 // Copyright (c) Microsoft. All rights reserved.
 
+using System.Globalization;
 using Microsoft.SemanticKernel;
 using Microsoft.SemanticKernel.Plugins.Core;
 using Xunit;
@@ -127,4 +128,46 @@ public void ItCanConcat(string? textToConcat, string text2ToConcat)
         // Assert
         Assert.Equal(expected, result);
     }
+
+    [Fact]
+    public void ItCanUppercaseWithCulture()
+    {
+        // Arrange
+        var plugin = new TextPlugin();
+
+        // Act
+        var result = plugin.Uppercase("i", new CultureInfo("tr-TR"));
+
+        // Assert
+        Assert.Equal("İ", result);
+    }
+
+    [Fact]
+    public void ItCanLowercaseWithCulture()
+    {
+        // Arrange
+        var plugin = new TextPlugin();
+
+        // Act
+        var result = plugin.Lowercase("I", new CultureInfo("tr-TR"));
+
+        // Assert
+        Assert.Equal("ı", result);
+    }
+
+    [Theory]
+    [InlineData("hello", "hello")]
+    [InlineData("", "")]
+    [InlineData(" ", " ")]
+    public void ItCanEcho(string input, string expected)
+    {
+        // Arrange
+        var plugin = new TextPlugin();
+
+        // Act
+        var result = plugin.Echo(input);
+
+        // Assert
+        Assert.Equal(expected, result);
+    }
 }