Disables DNS provider test mode where unsupported

Improves the DNS provider test functionality by disabling the test mode for providers that do not support it.

This change ensures that the credential test only runs for DNS providers that implement a test function, providing a clearer user experience and preventing unexpected errors.

Author: webprofusion-chrisc

src/Certify.Core/Management/CertifyManager/CertifyManager.DeploymentTasks.cs

@@ -566,8 +566,17 @@ public async Task<ActionResult> TestCredentials(string storageKey)
                         {
                             return new ActionResult { IsSuccess = false, Message = "Could not create DNS provider API. Invalid or unrecognised." };
                         }
-
-                        return await dnsProvider.Test();
+                        else
+                        {
+                            if (dnsProvider.IsTestModeSupported == false)
+                            {
+                                return new ActionResult { IsSuccess = false, Message = "This DNS provider does not support credential testing." };
+                            }
+                            else
+                            {
+                                return await dnsProvider.Test();
+                            }
+                        }
                     }
                     catch (Exception exp)
                     {

src/Certify.Providers/DNS/CertifyDns/DnsProviderCertifyDns.cs

@@ -270,7 +270,7 @@ public DnsProviderCertifyDns() : base()
 
         public async Task<ActionResult> Test()
         {
-            return await Task.FromResult(new ActionResult { IsSuccess = true, Message = "Test completed, but no zones returned." });
+            return await Task.FromResult(new ActionResult { IsSuccess = true, Message = "There is no supported test for this provide type." });
         }
 
         public async Task<ActionResult> CreateRecord(DnsRecord request)

src/Certify.Providers/DNS/CertifyManaged/DnsProviderCertifyManaged.cs

@@ -36,7 +36,7 @@ public static ChallengeProviderDefinition Definition
                         new ProviderParameter{ Key="authkey",Name="Client ID", IsRequired=true, IsCredential=true, IsPassword=false,  Description="API Auth Key" },
                         new ProviderParameter{ Key="authsecret",Name="Client Secret", IsRequired=true, IsCredential=true, IsPassword=true,  Description="API Auth Secret" }
                     },
-                    IsTestModeSupported = true,
+                    IsTestModeSupported = false,
                     ChallengeType = SupportedChallengeTypes.CHALLENGE_TYPE_DNS,
                     Config = "Provider=Certify.Providers.DNS.CertifyManaged",
                     HandlerType = ChallengeHandlerType.INTERNAL