Add E2E test

Author: javiercn

src/Components/test/E2ETest/Tests/FormsTest.cs

@@ -844,6 +844,25 @@ public void InputRadioGroupWorksWithMutatingSetter()
         Browser.Equal("False", () => tuesday.GetDomProperty("checked"));
     }
 
+    [Theory]
+    [InlineData(0)]
+    [InlineData(2)]
+    public void InputRadioGroupWorksWithParentImplementingIHandleEvent(int n)
+    {
+        Browser.Url = new UriBuilder(Browser.Url) { Query = ($"?n={n}") }.ToString();
+        var appElement = Browser.MountTestComponent<InputRadioParentImplementsIHandleEvent>();
+        var zero = appElement.FindElement(By.Id("inputradiogroup-parent-ihandle-event-0"));
+        var one = appElement.FindElement(By.Id("inputradiogroup-parent-ihandle-event-1"));
+
+        Browser.Equal(n == 0 ? "True" : "False", () => zero.GetDomProperty("checked"));
+        Browser.Equal("False", () => one.GetDomProperty("checked"));
+
+        // Observe that the value can be mutated by the setter, and this shows up in the DOM
+        one.Click();
+        Browser.Equal("False", () => zero.GetDomProperty("checked"));
+        Browser.Equal("True", () => one.GetDomProperty("checked"));
+    }
+
     [Fact]
     public void InputSelectWorksWithMutatingSetter()
     {

src/Components/test/testassets/BasicTestApp/FormsTest/InputRadioParentImplementsIHandleEvent.razor

@@ -0,0 +1,14 @@
+@using Microsoft.AspNetCore.Components.Forms
+@implements IHandleEvent
+
+<InputRadioGroup @bind-Value="N">
+  <InputRadio id="inputradiogroup-parent-ihandle-event-0" Value="0" />
+  <InputRadio id="inputradiogroup-parent-ihandle-event-1" Value="1" />
+</InputRadioGroup>
+
+@code {
+
+  [SupplyParameterFromQuery(Name = "n")] int? N { get; set; }
+
+  Task IHandleEvent.HandleEventAsync(EventCallbackWorkItem callback, object arg) => callback.InvokeAsync(arg);
+}

src/Components/test/testassets/BasicTestApp/Index.razor

@@ -49,6 +49,7 @@
         <option value="BasicTestApp.FormsTest.InputRangeComponent">Input range</option>
         <option value="BasicTestApp.FormsTest.InputsWithoutEditForm">Inputs without EditForm</option>
         <option value="BasicTestApp.FormsTest.InputsWithMutatingSetters">Inputs with mutating setters</option>
+        <option value="BasicTestApp.FormsTest.InputRadioParentImplementsIHandleEvent">Input Radio Parent Implements IHandleEvent</option>
         <option value="BasicTestApp.NavigateOnSubmit">Navigate to submit</option>
         <option value="BasicTestApp.GlobalizationBindCases">Globalization Bind Cases</option>
         <option value="BasicTestApp.GracefulTermination">Graceful Termination</option>