Fix ComponentBaseTests.

Check if ValueChanged.HasDelegate.
internal FluentWizard in FluentWizardStep

Author: agriffard

src/Core/Components/Wizard/FluentWizard.razor.cs

@@ -187,7 +187,11 @@ protected virtual async Task OnNextHandlerAsync(MouseEventArgs e)
         if (!isCanceled)
         {
             Value = targetIndex;
-            await ValueChanged.InvokeAsync(targetIndex);
+            if (ValueChanged.HasDelegate)
+            {
+                await ValueChanged.InvokeAsync(targetIndex);
+            }
+
             StateHasChanged();
         }
     }
@@ -210,7 +214,11 @@ protected virtual async Task OnPreviousHandlerAsync(MouseEventArgs e)
         if (!isCanceled)
         {
             Value = targetIndex;
-            await ValueChanged.InvokeAsync(targetIndex);
+            if (ValueChanged.HasDelegate)
+            {
+                await ValueChanged.InvokeAsync(targetIndex);
+            }
+
             StateHasChanged();
         }
     }
@@ -314,7 +322,11 @@ internal async Task ValidateAndGoToStepAsync(int targetIndex, bool validateEditC
         if (!isCanceled)
         {
             Value = targetIndex;
-            await ValueChanged.InvokeAsync(targetIndex);
+            if (ValueChanged.HasDelegate)
+            {
+                await ValueChanged.InvokeAsync(targetIndex);
+            }
+
             StateHasChanged();
         }
     }
@@ -329,7 +341,13 @@ internal int AddStep(FluentWizardStep step)
             SetCurrentStatusToStep(index);
         }
 
-        StateHasChanged();
+        try
+        {
+            StateHasChanged();
+        }
+        catch (InvalidOperationException ex) when (ex.Message.Contains("render handle is not yet assigned", StringComparison.OrdinalIgnoreCase))
+        {
+        }
 
         return index;
     }

src/Core/Components/Wizard/FluentWizardStep.razor.cs

@@ -93,7 +93,7 @@ public FluentWizardStep(LibraryConfiguration configuration) : base(configuration
     /// For internal use only.
     /// </summary>
     [CascadingParameter]
-    public FluentWizard FluentWizard { get; set; } = default!;
+    internal FluentWizard FluentWizard { get; set; } = default!;
 
     /// <summary>
     /// Gets or sets the summary of the step, to display near the label.

tests/Core/Components/Base/ComponentBaseTests.cs

@@ -70,6 +70,7 @@ public class ComponentBaseTests : Bunit.BunitContext
         { typeof(FluentNavSectionHeader), Loader.Default.WithCascadingValue(new FluentNav(new LibraryConfiguration())) },
         { typeof(FluentAppBarItem), Loader.Default.WithCascadingValue(new InternalAppBarContext(new FluentAppBar(new LibraryConfiguration()))) },
         { typeof(FluentSortableList<>), Loader.MakeGenericType(typeof(string)).WithRequiredParameter("ItemTemplate", (RenderFragment<string>)(p => builder => builder.AddContent(0, "MyItemTemplate")))},
+        { typeof(FluentWizardStep), Loader.Default.WithCascadingValue(new FluentWizard(new LibraryConfiguration())) },
     };
 
     /// <summary />