diff --git a/test/Microsoft.IdentityModel.Tokens.Tests/SupportedAlgorithmTests.cs b/test/Microsoft.IdentityModel.Tokens.Tests/SupportedAlgorithmTests.cs
index 5b7859128e..e00e277809 100644
--- a/test/Microsoft.IdentityModel.Tokens.Tests/SupportedAlgorithmTests.cs
+++ b/test/Microsoft.IdentityModel.Tokens.Tests/SupportedAlgorithmTests.cs
@@ -2,6 +2,7 @@
 // Licensed under the MIT License.
 
 using System;
+using System.Collections.Generic;
 using Microsoft.IdentityModel.TestUtils;
 using Xunit;
 
@@ -170,6 +171,47 @@ public static TheoryData<SupportedAlgorithmTheoryData> IsSupportedAlgorithmAndKe
                     "X509_CustomCryptoProviderFactory",
                     theoryData);
 
+                // Add "none" and "noNe" test cases for all key types
+                var keyTypes = new Dictionary<string, SecurityKey>
+                {
+                    { "JsonWebKey_Ecdsa", KeyingMaterial.JsonWebKeyP256 },
+                    { "JsonWebKey_Rsa", KeyingMaterial.JsonWebKeyRsa_2048 },
+                    { "JsonWebKey_Symmetric", KeyingMaterial.JsonWebKeySymmetric256 },
+                    { "Rsa", KeyingMaterial.RsaSecurityKey_2048 },
+                    { "Symmetric", KeyingMaterial.DefaultSymmetricSecurityKey_256 },
+                    { "X509", KeyingMaterial.X509SecurityKeySelfSigned2048_SHA256 },
+                    { "Ecdsa", KeyingMaterial.Ecdsa384Key }
+                };
+
+                // All permutations of "none" with different capitalizations
+                var nonePermutations = new[]
+                {
+                    "none",
+                    "None",
+                    "nOne",
+                    "noNe",
+                    "nonE",
+                    "NOne",
+                    "NONe",
+                    "NOnE",
+                    "noNE",
+                    "nONE",
+                    "NoNe",
+                    "NoNE",
+                    "NOnE",
+                    "nONe",
+                    "nonE",
+                    "NONE"
+                };
+
+                foreach (var keyType in keyTypes)
+                {
+                    foreach (var permutation in nonePermutations)
+                    {
+                        SupportedAlgorithmTheoryData.AddTestCase(permutation, keyType.Value, false, $"{keyType.Key}_{permutation}", theoryData);
+                    }
+                }
+
                 return theoryData;
             }
         }