fix: register ClientScriptShim in bUnit tests + fix PostBack demo URL

- Add ClientScriptShim to DI in all WebFormsPageBase test files
- Set JSInterop.Mode = JSRuntimeMode.Loose for postback JS calls
- Fix Playwright PostBackTests URL: /postback-demo -> /ControlSamples/PostBackDemo
- Update BlazorWebFormsTestContext shared base with ClientScriptShim
- Update IsPostBackTests with ClientScriptShim + loose JS mode
- All 2,823 tests pass on net10.0

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: csharpfritz

samples/AfterBlazorServerSide.Tests/Migration/PostBackTests.cs

@@ -28,7 +28,7 @@ public async Task PostBack_Button_TriggersPostBackEvent()
 
         try
         {
-            await page.GotoAsync($"{_fixture.BaseUrl}/postback-demo", new PageGotoOptions
+            await page.GotoAsync($"{_fixture.BaseUrl}/ControlSamples/PostBackDemo", new PageGotoOptions
             {
                 WaitUntil = WaitUntilState.NetworkIdle,
                 Timeout = 30000
@@ -76,7 +76,7 @@ public async Task PostBackHyperlink_Click_TriggersPostBackEvent()
 
         try
         {
-            await page.GotoAsync($"{_fixture.BaseUrl}/postback-demo", new PageGotoOptions
+            await page.GotoAsync($"{_fixture.BaseUrl}/ControlSamples/PostBackDemo", new PageGotoOptions
             {
                 WaitUntil = WaitUntilState.NetworkIdle,
                 Timeout = 30000
@@ -124,7 +124,7 @@ public async Task ScriptManager_GetCurrent_RegistersStartupScript()
 
         try
         {
-            await page.GotoAsync($"{_fixture.BaseUrl}/postback-demo", new PageGotoOptions
+            await page.GotoAsync($"{_fixture.BaseUrl}/ControlSamples/PostBackDemo", new PageGotoOptions
             {
                 WaitUntil = WaitUntilState.NetworkIdle,
                 Timeout = 30000

src/BlazorWebFormsComponents.Test/BlazorWebFormsTestContext.cs

@@ -30,9 +30,8 @@ protected BlazorWebFormsTestContext() : this(null)
     /// <param name="outputHelper">Optional xUnit test output helper for logging. When provided, enables logging output in test results.</param>
     protected BlazorWebFormsTestContext(ITestOutputHelper outputHelper)
     {
-        // Configure bUnit's JSInterop to handle the OnAfterRender call
-        // This is required because the base component calls this on first render
-        JSInterop.SetupVoid("bwfc.Page.OnAfterRender");
+        // Configure bUnit's JSInterop to handle all JS calls from lifecycle methods
+        JSInterop.Mode = JSRuntimeMode.Loose;
 
         // Register required services for BaseWebFormsComponent and WebFormsPageBase
         Services.AddSingleton<LinkGenerator>(new Mock<LinkGenerator>().Object);
@@ -41,6 +40,7 @@ protected BlazorWebFormsTestContext(ITestOutputHelper outputHelper)
         Services.AddMemoryCache();
         Services.AddScoped<CacheShim>();
         Services.AddScoped<ServerShim>();
+        Services.AddScoped<ClientScriptShim>();
 
         // Always register logging so ILogger<T> is resolvable.
         // Add xUnit output sink when a test output helper is provided.

src/BlazorWebFormsComponents.Test/IsPostBackTests.cs

@@ -34,7 +34,7 @@ public class IsPostBackTests : IDisposable
 	public IsPostBackTests()
 	{
 		_ctx = new BunitContext();
-		_ctx.JSInterop.SetupVoid("bwfc.Page.OnAfterRender");
+		_ctx.JSInterop.Mode = JSRuntimeMode.Loose;
 		_ctx.Services.AddSingleton<LinkGenerator>(new Mock<LinkGenerator>().Object);
 		_ctx.Services.AddSingleton<IDataProtectionProvider>(new EphemeralDataProtectionProvider());
 		_ctx.Services.AddLogging();
@@ -43,6 +43,7 @@ public IsPostBackTests()
 		_ctx.Services.AddMemoryCache();
 		_ctx.Services.AddScoped<CacheShim>();
 		_ctx.Services.AddScoped<ServerShim>();
+		_ctx.Services.AddScoped<ClientScriptShim>();
 	}
 
 	private static IWebHostEnvironment CreateMockWebHostEnv()

src/BlazorWebFormsComponents.Test/WebFormsPageBase/GetRouteUrlTests.razor

@@ -73,6 +73,7 @@
 
 	private (IRenderedComponent<TestPage> cut, CapturingLinkGenerator linkGen) RenderWithCapturingLinkGen()
 	{
+		JSInterop.Mode = JSRuntimeMode.Loose;
 		var linkGen = new CapturingLinkGenerator();
 		Services.AddSingleton<LinkGenerator>(linkGen);
 		var mockHttpAccessor = new Mock<IHttpContextAccessor>();
@@ -94,6 +95,7 @@
 		Services.AddMemoryCache();
 		Services.AddScoped<CacheShim>();
 		Services.AddScoped<ServerShim>();
+		Services.AddScoped<ClientScriptShim>();
 	}
 
 	[Fact]

src/BlazorWebFormsComponents.Test/WebFormsPageBase/RenderModeGuardTests.razor

@@ -29,6 +29,7 @@
 
 	private IRenderedComponent<TestPage> RenderWithHttpContext()
 	{
+		JSInterop.Mode = JSRuntimeMode.Loose;
 		var mockHttpAccessor = new Mock<IHttpContextAccessor>();
 		mockHttpAccessor.Setup(x => x.HttpContext).Returns(new DefaultHttpContext());
 		Services.AddSingleton<IHttpContextAccessor>(mockHttpAccessor.Object);
@@ -42,6 +43,7 @@
 
 	private IRenderedComponent<TestPage> RenderWithoutHttpContext()
 	{
+		JSInterop.Mode = JSRuntimeMode.Loose;
 		var mockHttpAccessor = new Mock<IHttpContextAccessor>();
 		mockHttpAccessor.Setup(x => x.HttpContext).Returns((HttpContext)null);
 		Services.AddSingleton<IHttpContextAccessor>(mockHttpAccessor.Object);
@@ -62,6 +64,7 @@
 		Services.AddMemoryCache();
 		Services.AddScoped<CacheShim>();
 		Services.AddScoped<ServerShim>();
+		Services.AddScoped<ClientScriptShim>();
 	}
 
 	[Fact]

src/BlazorWebFormsComponents.Test/WebFormsPageBase/RequestShimTests.razor

@@ -22,6 +22,7 @@
 
 	private IRenderedComponent<TestPage> RenderWithMockNav(string uri = null)
 	{
+		JSInterop.Mode = JSRuntimeMode.Loose;
 		var nav = new MockNavigationManager(initialUri: uri ?? "http://localhost/");
 		Services.AddSingleton<Microsoft.AspNetCore.Components.NavigationManager>(nav);
 		var mockAccessor = new Mock<IHttpContextAccessor>();
@@ -43,6 +44,7 @@
 		Services.AddMemoryCache();
 		Services.AddScoped<CacheShim>();
 		Services.AddScoped<ServerShim>();
+		Services.AddScoped<ClientScriptShim>();
 	}
 
 	[Fact]
@@ -118,6 +120,7 @@
 	[Fact]
 	public void Cookies_WithHttpContext_ReturnsRealCookies()
 	{
+		JSInterop.Mode = JSRuntimeMode.Loose;
 		// Set up a real HttpContext with cookies
 		var httpContext = new DefaultHttpContext();
 		httpContext.Request.Headers["Cookie"] = "session=abc123";

src/BlazorWebFormsComponents.Test/WebFormsPageBase/ResponseShimTests.razor

@@ -21,6 +21,7 @@
 
 	private (IRenderedComponent<TestPage> cut, MockNavigationManager nav) RenderWithMockNav()
 	{
+		JSInterop.Mode = JSRuntimeMode.Loose;
 		var mockNav = new MockNavigationManager();
 		Services.AddSingleton<Microsoft.AspNetCore.Components.NavigationManager>(mockNav);
 		Services.AddLogging();
@@ -33,6 +34,7 @@
 		Services.AddMemoryCache();
 		Services.AddScoped<CacheShim>();
 		Services.AddScoped<ServerShim>();
+		Services.AddScoped<ClientScriptShim>();
 		return (Render<TestPage>(), mockNav);
 	}
 

src/BlazorWebFormsComponents.Test/WebFormsPageBase/ViewStateTests.razor

@@ -20,6 +20,7 @@
 
 	private IRenderedComponent<TestPage> RenderTestPage()
 	{
+		JSInterop.Mode = JSRuntimeMode.Loose;
 		Services.AddLogging();
 		Services.AddScoped<SessionShim>();
 		Services.AddScoped<IPageService, PageService>();
@@ -36,6 +37,7 @@
 		Services.AddMemoryCache();
 		Services.AddScoped<CacheShim>();
 		Services.AddScoped<ServerShim>();
+		Services.AddScoped<ClientScriptShim>();
 	}
 
 	[Fact]

src/BlazorWebFormsComponents.Test/WebFormsPageBase/WebFormsPageBaseTests.razor

@@ -22,6 +22,7 @@
 
 	private IRenderedComponent<TestPage> RenderTestPage()
 	{
+		JSInterop.Mode = JSRuntimeMode.Loose;
 		Services.AddLogging();
 		Services.AddScoped<SessionShim>();
 		Services.AddScoped<IPageService, PageService>();
@@ -38,6 +39,7 @@
 		Services.AddMemoryCache();
 		Services.AddScoped<CacheShim>();
 		Services.AddScoped<ServerShim>();
+		Services.AddScoped<ClientScriptShim>();
 	}
 
 	[Fact]