Improve SGU logon resilience and client UX

tests/SGU.CredentialProvider.SmokeProbe/Program.cs

@@ -10,9 +10,11 @@ namespace SGU.CredentialProvider.SmokeProbe;
 internal static class Program
 {
     private static readonly Guid ProviderClassId = new("D789CFD8-5AD4-489F-9B83-7EB5D9D09335");
+    private static readonly Guid ProviderLogoFieldType = new("2D837775-F6CD-464E-A745-482FD0B47493");
 
     private static readonly string[] ExpectedLabels =
     [
+        "Acceso institucional SGU",
         "Acceso institucional SGU",
         "Usa tu clave institucional (DO, AL o AD + 6 dígitos) y contraseña.",
         "Clave institucional",
@@ -52,6 +54,7 @@ internal static class Program
             ThrowIfFailed(provider.GetFieldDescriptorCount(out uint fieldCount), "GetFieldDescriptorCount");
 
             List<string> labels = [];
+            bool providerLogoPresent = false;
             for (uint index = 0; index < fieldCount; index++)
             {
                 ThrowIfFailed(provider.GetFieldDescriptorAt(index, out IntPtr descriptorPointer), "GetFieldDescriptorAt");
@@ -64,6 +67,8 @@ internal static class Program
                 {
                     FieldDescriptor descriptor = Marshal.PtrToStructure<FieldDescriptor>(descriptorPointer);
                     labels.Add(descriptor.Label ?? string.Empty);
+                    providerLogoPresent |= descriptor.FieldType == FieldType.TileImage &&
+                        descriptor.FieldTypeGuid == ProviderLogoFieldType;
                 }
                 finally
                 {
@@ -81,6 +86,7 @@ internal static class Program
             bool passed = fieldCount == ExpectedLabels.Length &&
                 credentialCount == 1 &&
                 credential != IntPtr.Zero &&
+                providerLogoPresent &&
                 labels.SequenceEqual(ExpectedLabels, StringComparer.Ordinal);
 
             if (mode != "enumeration" && passed)
@@ -96,6 +102,7 @@ internal static class Program
                 usageScenario = "Logon",
                 fieldCount,
                 labels,
+                providerLogoPresent,
                 credentialCount,
                 defaultIndex,
                 autoLogon = autoLogon != 0