diff --git a/tests/NATS.Client.Core.Tests/NatsConnectionTest.Auth.cs b/tests/NATS.Client.Core.Tests/NatsConnectionTest.Auth.cs
index 11c6ac559..c0999db82 100644
--- a/tests/NATS.Client.Core.Tests/NatsConnectionTest.Auth.cs
+++ b/tests/NATS.Client.Core.Tests/NatsConnectionTest.Auth.cs
@@ -56,6 +56,23 @@ NatsOpts.Default with
                 }),
         };
 
+        yield return new object[]
+        {
+            new Auth(
+                "NKEY (NkeyHandler & SeedHandler takes precedence over NKey & Seed)",
+                "resources/configs/auth/nkey.conf",
+                NatsOpts.Default with
+                {
+                    AuthOpts = NatsAuthOpts.Default with
+                    {
+                        NKeyHandler = () => new ValueTask<string>("UALQSMXRSAA7ZXIGDDJBJ2JOYJVQIWM3LQVDM5KYIPG4EP3FAGJ47BOJ"),
+                        NKey = "invalid nkey",
+                        SeedHandler = () => new ValueTask<string>("SUAAVWRZG6M5FA5VRRGWSCIHKTOJC7EWNIT4JV3FTOIPO4OBFR5WA7X5TE"),
+                        Seed = "invalid seed",
+                    },
+                }),
+        };
+
         yield return new object[]
         {
             new Auth(
@@ -83,6 +100,25 @@ NatsOpts.Default with
                 }),
         };
 
+        yield return new object[]
+        {
+            new Auth(
+                "USER-CREDS (JwtHandler & SeedHandler takes precedence over Jwt & Seed)",
+                "resources/configs/auth/operator.conf",
+                NatsOpts.Default with
+                {
+                    AuthOpts = NatsAuthOpts.Default with
+                    {
+                        JwtHandler = () => new ValueTask<string>(
+                                "eyJ0eXAiOiJKV1QiLCJhbGciOiJlZDI1NTE5LW5rZXkifQ.eyJqdGkiOiJOVDJTRkVIN0pNSUpUTzZIQ09GNUpYRFNDUU1WRlFNV0MyWjI1TFk3QVNPTklYTjZFVlhBIiwiaWF0IjoxNjc5MTQ0MDkwLCJpc3MiOiJBREpOSlpZNUNXQlI0M0NOSzJBMjJBMkxPSkVBSzJSS1RaTk9aVE1HUEVCRk9QVE5FVFBZTUlLNSIsIm5hbWUiOiJteS11c2VyIiwic3ViIjoiVUJPWjVMUVJPTEpRRFBBQUNYSk1VRkJaS0Q0R0JaSERUTFo3TjVQS1dSWFc1S1dKM0VBMlc0UloiLCJuYXRzIjp7InB1YiI6e30sInN1YiI6e30sInN1YnMiOi0xLCJkYXRhIjotMSwicGF5bG9hZCI6LTEsInR5cGUiOiJ1c2VyIiwidmVyc2lvbiI6Mn19.ElYEknDixe9pZdl55S9PjduQhhqR1OQLglI1JO7YK7ECYb1mLUjGd8ntcR7ISS04-_yhygSDzX8OS8buBIxMDA"),
+                        SeedHandler = () => new ValueTask<string>(
+                                "SUAJR32IC6D45J3URHJ5AOQZWBBO6QTID27NZQKXE3GC5U3SPFEYDJK6RQ"),
+                        Jwt = "not a valid jwt",
+                        Seed = "invalid nkey seed",
+                    },
+                }),
+        };
+
         yield return new object[]
         {
             new Auth(
@@ -93,6 +129,17 @@ NatsOpts.Default with
                     AuthOpts = NatsAuthOpts.Default with { CredsFile = "resources/configs/auth/user.creds", },
                 }),
         };
+
+        yield return new object[]
+        {
+            new Auth(
+                "TokenHandler (takes precedence over Token)",
+                "resources/configs/auth/token.conf",
+                NatsOpts.Default with
+                {
+                    AuthOpts = NatsAuthOpts.Default with { Token = "won't be used",  TokenHandler = () => new ValueTask<string>("s3cr3t"), },
+                }),
+        };
     }
 
     [Theory]