diff --git a/tests/FilterLists.Agent.Tests/Extensions/UriExtensionsTests.cs b/tests/FilterLists.Agent.Tests/Extensions/UriExtensionsTests.cs
index 3b882dca7..e69d12feb 100644
--- a/tests/FilterLists.Agent.Tests/Extensions/UriExtensionsTests.cs
+++ b/tests/FilterLists.Agent.Tests/Extensions/UriExtensionsTests.cs
@@ -7,6 +7,22 @@ namespace FilterLists.Agent.Tests.Extensions
 {
     public class UriExtensionsTests
     {
+        [Fact]
+        public void GetExtension_UriWithoutExtension_ReturnsEmptyString()
+        {
+            var uri = new Uri("https://www.google.com/");
+            var sut = uri.GetExtension();
+            Assert.Equal("", sut);
+        }
+
+        [Fact]
+        public void GetExtension_UriWithExtension_ReturnsExtension()
+        {
+            var uri = new Uri("https://www.google.com/robots.txt");
+            var sut = uri.GetExtension();
+            Assert.Equal(".txt", sut);
+        }
+
         [Fact]
         public void IsValidUrl_WithValidUrl_ReturnsTrue()
         {