diff --git a/test/OpenIddict.Tests/OpenIddictExtensionsTests.cs b/test/OpenIddict.Tests/OpenIddictExtensionsTests.cs
index eee39891..e3864640 100644
--- a/test/OpenIddict.Tests/OpenIddictExtensionsTests.cs
+++ b/test/OpenIddict.Tests/OpenIddictExtensionsTests.cs
@@ -16,6 +16,7 @@ namespace OpenIddict.Tests
 {
     public class OpenIddictExtensionsTests
     {
+        [Fact]
         public void UseDefaultModels_KeyTypeDefaultsToString()
         {
             // Arrange
@@ -35,6 +36,7 @@ namespace OpenIddict.Tests
             Assert.Equal(typeof(OpenIddictToken), options.DefaultTokenType);
         }
 
+        [Fact]
         public void UseDefaultModels_KeyTypeCanBeOverriden()
         {
             // Arrange
@@ -42,6 +44,9 @@ namespace OpenIddict.Tests
             var builder = services.AddOpenIddict().AddCore();
 
             // Act
+            builder.UseDefaultModels<Guid>();
+
+            // Assert
             var provider = services.BuildServiceProvider();
             var options = provider.GetRequiredService<IOptionsMonitor<OpenIddictCoreOptions>>().CurrentValue;