public void RendersChildContentIfAuthorized()
{
// Arrange
var authorizationService = new TestAuthorizationService();
authorizationService.NextResult = AuthorizationResult.Success();
var renderer = CreateTestRenderer(authorizationService);
var rootComponent = WrapInAuthorizeView(
childContent: context => builder =>
builder.AddContent(0, $"You are authenticated as {context.User.Identity.Name}"));
rootComponent.AuthenticationState = CreateAuthenticationState("Nellie");
// Act
renderer.AssignRootComponentId(rootComponent);
rootComponent.TriggerRender();
// Assert
var diff = renderer.Batches.Single().GetComponentDiffs <AuthorizeView>().Single();
Assert.Collection(diff.Edits, edit =>
{
Assert.Equal(RenderTreeEditType.PrependFrame, edit.Type);
AssertFrame.Text(
renderer.Batches.Single().ReferenceFrames[edit.ReferenceFrameIndex],
"You are authenticated as Nellie");
});
// Assert: The IAuthorizationService was given expected criteria
Assert.Collection(authorizationService.AuthorizeCalls, call =>
{
Assert.Equal("Nellie", call.user.Identity.Name);
Assert.Null(call.resource);
Assert.Collection(call.requirements,
req => Assert.IsType <DenyAnonymousAuthorizationRequirement>(req));
});
}
public void RespondsToNotificationsFromAuthenticationStateProvider()
{
// Arrange: Service
var services = new ServiceCollection();
var authStateProvider = new TestAuthenticationStateProvider()
{
CurrentAuthStateTask = Task.FromResult(CreateAuthenticationState(null))
};
services.AddSingleton <AuthenticationStateProvider>(authStateProvider);
// Arrange: Renderer and component, initially rendered
var renderer = new TestRenderer(services.BuildServiceProvider());
var component = new UseCascadingAuthenticationStateComponent();
renderer.AssignRootComponentId(component);
component.TriggerRender();
var receiveAuthStateId = renderer.Batches.Single()
.GetComponentFrames <ReceiveAuthStateComponent>().Single().ComponentId;
// Act 2: AuthenticationStateProvider issues notification
authStateProvider.TriggerAuthenticationStateChanged(
Task.FromResult(CreateAuthenticationState("Bert")));
// Assert 2: Re-renders content
Assert.Equal(2, renderer.Batches.Count);
var batch = renderer.Batches.Last();
var receiveAuthStateDiff = batch.DiffsByComponentId[receiveAuthStateId].Single();
Assert.Collection(receiveAuthStateDiff.Edits, edit =>
{
Assert.Equal(RenderTreeEditType.UpdateText, edit.Type);
AssertFrame.Text(
batch.ReferenceFrames[edit.ReferenceFrameIndex],
"Authenticated: True; Name: Bert; Pending: False; Renders: 2");
});
}
public void PassesCascadingParametersToNestedComponents()
{
// Arrange
var renderer = new TestRenderer();
var component = new TestComponent(builder =>
{
builder.OpenComponent <CascadingValue <string> >(0);
builder.AddAttribute(1, "Value", "Hello");
builder.AddAttribute(2, "ChildContent", new RenderFragment(childBuilder =>
{
childBuilder.OpenComponent <CascadingParameterConsumerComponent <string> >(0);
childBuilder.AddAttribute(1, "RegularParameter", "Goodbye");
childBuilder.CloseComponent();
}));
builder.CloseComponent();
});
// Act/Assert
var componentId = renderer.AssignRootComponentId(component);
component.TriggerRender();
var batch = renderer.Batches.Single();
var nestedComponent = FindComponent <CascadingParameterConsumerComponent <string> >(batch, out var nestedComponentId);
var nestedComponentDiff = batch.DiffsByComponentId[nestedComponentId].Single();
// The nested component was rendered with the correct parameters
Assert.Collection(nestedComponentDiff.Edits,
edit =>
{
Assert.Equal(RenderTreeEditType.PrependFrame, edit.Type);
AssertFrame.Text(
batch.ReferenceFrames[edit.ReferenceFrameIndex],
"CascadingParameter=Hello; RegularParameter=Goodbye");
});
Assert.Equal(1, nestedComponent.NumRenders);
}
public void SkipsUnmodifiedTrailingSiblings()
{
// Arrange
oldTree.AddContent(10, "text1");
oldTree.AddContent(11, "text2");
oldTree.AddContent(12, "text3");
oldTree.AddContent(13, "text4");
newTree.AddContent(10, "text1");
newTree.AddContent(11, "text2modified");
newTree.AddContent(12, "text3");
newTree.AddContent(13, "text4");
// Act
var(result, referenceFrames) = GetSingleUpdatedComponent();
// Assert
Assert.Collection(result.Edits,
entry =>
{
AssertEdit(entry, RenderTreeEditType.UpdateText, 1);
Assert.Equal(0, entry.ReferenceFrameIndex);
});
AssertFrame.Text(referenceFrames[0], "text2modified", 11);
}
public void RazorTemplate_Generic_CanBeUsedFromMethod()
{
// Arrange
var component = CompileToComponent(@"
@(Repeat((context) => @<div>@context.ToLower()</div>, ""Hello, World!"", 3))
@functions {
RenderFragment Repeat<T>(RenderFragment<T> template, T value, int count)
{
return (b) =>
{
for (var i = 0; i < count; i++)
{
b.AddContent(i, template, value);
}
};
}
}");
// Act
var frames = GetRenderTree(component);
// Assert
//
// The sequence numbers start at 1 here because there is an AddContent(0, Repeat(....) call
// that precedes the definition of the lambda. Sequence numbers for the lambda are allocated
// from the same logical sequence as the surrounding code.
Assert.Collection(
frames,
frame => AssertFrame.Element(frame, "div", 2, 1),
frame => AssertFrame.Text(frame, "hello, world!", 2),
frame => AssertFrame.Element(frame, "div", 2, 1),
frame => AssertFrame.Text(frame, "hello, world!", 2),
frame => AssertFrame.Element(frame, "div", 2, 1),
frame => AssertFrame.Text(frame, "hello, world!", 2));
}
public void CanIncludeChildrenInComponents()
{
// Arrange/Act
var testComponentTypeName = FullTypeName<TestComponent>();
var component = CompileToComponent($"<c:{testComponentTypeName} MyAttr=@(\"abc\")>" +
$"Some text" +
$"<some-child a='1'>Nested text</some-child>" +
$"</c:{testComponentTypeName}>");
var frames = GetRenderTree(component);
// Assert: component frames are correct
Assert.Collection(frames,
frame => AssertFrame.Component<TestComponent>(frame, 3, 0),
frame => AssertFrame.Attribute(frame, "MyAttr", "abc", 1),
frame => AssertFrame.Attribute(frame, RenderTreeBuilder.ChildContent, 2));
// Assert: Captured ChildContent frames are correct
var childFrames = GetFrames((RenderFragment)frames[2].AttributeValue);
Assert.Collection(childFrames,
frame => AssertFrame.Text(frame, "Some text", 3),
frame => AssertFrame.Element(frame, "some-child", 3, 4),
frame => AssertFrame.Attribute(frame, "a", "1", 5),
frame => AssertFrame.Text(frame, "Nested text", 6));
}
public void CanReRenderTopLevelComponents()
{
// Arrange
var renderer = new TestRenderer();
var component = new MessageComponent {
Message = "Initial message"
};
var componentId = renderer.AssignComponentId(component);
// Act/Assert: first render
renderer.RenderNewBatch(componentId);
var firstDiff = renderer.Batches.Single().DiffsByComponentId[componentId].Single();
Assert.Collection(firstDiff.Edits,
edit =>
{
Assert.Equal(RenderTreeEditType.PrependFrame, edit.Type);
Assert.Equal(0, edit.ReferenceFrameIndex);
});
Assert.Collection(firstDiff.ReferenceFrames,
frame => AssertFrame.Text(frame, "Initial message"));
// Act/Assert: second render
component.Message = "Modified message";
renderer.RenderNewBatch(componentId);
var secondDiff = renderer.Batches.Skip(1).Single().DiffsByComponentId[componentId].Single();
Assert.Collection(firstDiff.Edits,
edit =>
{
Assert.Equal(RenderTreeEditType.UpdateText, edit.Type);
Assert.Equal(0, edit.ReferenceFrameIndex);
});
Assert.Collection(firstDiff.ReferenceFrames,
frame => AssertFrame.Text(frame, "Modified message"));
}
public void RazorTemplate_Generic_CanBeUsedFromRazorCode()
{
// Arrange
var component = CompileToComponent(@"
@{ RenderFragment<string> template = (context) => @<div>@context.ToLower()</div>; }
@for (var i = 0; i < 3; i++)
{
@template(""Hello, World!"");
}
");
// Act
var frames = GetRenderTree(component);
// Assert
Assert.Collection(
frames,
frame => AssertFrame.Element(frame, "div", 2, 0),
frame => AssertFrame.Text(frame, "hello, world!", 1),
frame => AssertFrame.Element(frame, "div", 2, 0),
frame => AssertFrame.Text(frame, "hello, world!", 1),
frame => AssertFrame.Element(frame, "div", 2, 0),
frame => AssertFrame.Text(frame, "hello, world!", 1));
}
public void Render_GenericComponent_WithoutChildContent()
{
// Arrange
AdditionalSyntaxTrees.Add(GenericContextComponent);
var component = CompileToComponent(@"
<GenericContext TItem=int Items=""@(new List<int>() { 1, 2, })"" />");
// Act
var frames = GetRenderTree(component);
// Assert
var genericComponentType = component.GetType().Assembly.DefinedTypes
.Where(t => t.Name == "GenericContext`1")
.Single()
.MakeGenericType(typeof(int));
Assert.Collection(
frames,
frame => AssertFrame.Component(frame, genericComponentType.FullName, 2, 0),
frame => AssertFrame.Attribute(frame, "Items", typeof(List <int>), 1),
frame => AssertFrame.Text(frame, "1", 0),
frame => AssertFrame.Text(frame, "2", 1));
}
public void SupportsCSharpExpressions()
{
// Arrange/Act
var component = CompileToComponent(@"
@(""Hello"")
@((object)null)
@(123)
@(new object())
");
// Assert
var frames = GetRenderTree(component);
Assert.Collection(frames,
frame => AssertFrame.Whitespace(frame, 0),
frame => AssertFrame.Text(frame, "Hello", 1),
frame => AssertFrame.Whitespace(frame, 2),
frame => AssertFrame.Whitespace(frame, 3), // @((object)null)
frame => AssertFrame.Whitespace(frame, 4),
frame => AssertFrame.Text(frame, "123", 5),
frame => AssertFrame.Whitespace(frame, 6),
frame => AssertFrame.Text(frame, new object().ToString(), 7),
frame => AssertFrame.Whitespace(frame, 8));
}
public void SkipsUnmodifiedSubtrees()
{
// Arrange
oldTree.OpenElement(10, "root");
oldTree.AddText(11, "Text that will change");
oldTree.OpenElement(12, "Subtree that will not change");
oldTree.OpenElement(13, "Another");
oldTree.AddText(14, "Text that will not change");
oldTree.CloseElement();
oldTree.CloseElement();
oldTree.CloseElement();
newTree.OpenElement(10, "root");
newTree.AddText(11, "Text that has changed");
newTree.OpenElement(12, "Subtree that will not change");
newTree.OpenElement(13, "Another");
newTree.AddText(14, "Text that will not change");
newTree.CloseElement();
newTree.CloseElement();
newTree.CloseElement();
// Act
var result = GetSingleUpdatedComponent();
// Assert
Assert.Collection(result.Edits,
entry => AssertEdit(entry, RenderTreeEditType.StepIn, 0),
entry =>
{
AssertEdit(entry, RenderTreeEditType.UpdateText, 0);
Assert.Equal(0, entry.ReferenceFrameIndex);
},
entry => AssertEdit(entry, RenderTreeEditType.StepOut, 0));
Assert.Collection(result.ReferenceFrames,
frame => AssertFrame.Text(frame, "Text that has changed", 11));
}
public void BuildRenderTree_ForPropertyWithDisplayAttributeAndStringLocalizer_Should_CreateCorrectFramesUsingStringLocalizer()
{
// Arrange
var stringLocalizerMock = new Mock <IStringLocalizer>();
stringLocalizerMock.Setup(l => l[It.IsAny <string>()]).Returns(new LocalizedString("name", "value"));
_sut.StringLocalizerMock = stringLocalizerMock.Object;
_sut.For = () => _model.First;
// Act
var renderTreeBuilder = new RenderTreeBuilder();
_sut.BuildRenderTreeMock(renderTreeBuilder);
// Assert
var frames = renderTreeBuilder.GetFrames().Array;
AssertFrame.Element(frames[0], "label", 2);
AssertFrame.Text(frames[1], "value");
// Verify
stringLocalizerMock.Verify(localizer => localizer["Person_First"], Times.Once);
}
public void Render_BodyChildContent_Generic()
{
// Arrange
AdditionalSyntaxTrees.Add(RenderChildContentStringComponent);
var component = CompileToComponent(@"
<RenderChildContentString Value=""HI"">
<div>@context.ToLowerInvariant()</div>
</RenderChildContentString>");
// Act
var frames = GetRenderTree(component);
// Assert
Assert.Collection(
frames,
frame => AssertFrame.Component(frame, "Test.RenderChildContentString", 3, 0),
frame => AssertFrame.Attribute(frame, "Value", "HI", 1),
frame => AssertFrame.Attribute(frame, "ChildContent", 2),
frame => AssertFrame.MarkupWhitespace(frame, 3),
frame => AssertFrame.Element(frame, "div", 2, 4),
frame => AssertFrame.Text(frame, "hi", 5),
frame => AssertFrame.MarkupWhitespace(frame, 6));
}
public void CanRenderComponentByTypeWithParameters()
{
// Arrange
var instance = new DynamicComponent();
var renderer = new TestRenderer();
var childParameters = new Dictionary <string, object>
{
{ nameof(TestComponent.IntProp), 123 },
{ nameof(TestComponent.ChildContent), (RenderFragment)(builder =>
{
builder.AddContent(0, "This is some child content");
}) },
};
var parameters = ParameterView.FromDictionary(new Dictionary <string, object>
{
{ nameof(DynamicComponent.Type), typeof(TestComponent) },
{ nameof(DynamicComponent.Parameters), childParameters },
});
// Act
renderer.RenderRootComponent(
renderer.AssignRootComponentId(instance),
parameters);
// Assert
var batch = renderer.Batches.Single();
// It renders a reference to the child component with its parameters
AssertFrame.Component <TestComponent>(batch.ReferenceFrames[0], 4, 0);
AssertFrame.Attribute(batch.ReferenceFrames[1], nameof(TestComponent.IntProp), 123, 1);
AssertFrame.Attribute(batch.ReferenceFrames[2], nameof(TestComponent.ChildContent), 1);
// The child component itself is rendered
AssertFrame.Text(batch.ReferenceFrames[4], "Hello from TestComponent with IntProp=123", 0);
AssertFrame.Text(batch.ReferenceFrames[5], "This is some child content", 0);
}
public void RendersAuthorizingUntilAuthorizationCompleted()
{
// Arrange
var @event = new ManualResetEventSlim();
var authorizationService = new TestAuthorizationService();
authorizationService.NextResult = AuthorizationResult.Success();
var renderer = CreateTestRenderer(authorizationService);
renderer.OnUpdateDisplayComplete = () => { @event.Set(); };
var rootComponent = WrapInAuthorizeView(
authorizing: builder => builder.AddContent(0, "Auth pending..."),
authorized: context => builder => builder.AddContent(0, $"Hello, {context.User.Identity.Name}!"));
var authTcs = new TaskCompletionSource <AuthenticationState>();
rootComponent.AuthenticationState = authTcs.Task;
// Act/Assert 1: Auth pending
renderer.AssignRootComponentId(rootComponent);
rootComponent.TriggerRender();
var batch1 = renderer.Batches.Single();
var authorizeViewComponentId = batch1.GetComponentFrames <AuthorizeView>().Single().ComponentId;
var diff1 = batch1.DiffsByComponentId[authorizeViewComponentId].Single();
Assert.Collection(diff1.Edits, edit =>
{
Assert.Equal(RenderTreeEditType.PrependFrame, edit.Type);
AssertFrame.Text(
batch1.ReferenceFrames[edit.ReferenceFrameIndex],
"Auth pending...");
});
// Act/Assert 2: Auth process completes asynchronously
@event.Reset();
authTcs.SetResult(CreateAuthenticationState("Monsieur").Result);
// We need to wait here because the continuations of SetResult will be scheduled to run asynchronously.
@event.Wait(Timeout);
Assert.Equal(2, renderer.Batches.Count);
var batch2 = renderer.Batches[1];
var diff2 = batch2.DiffsByComponentId[authorizeViewComponentId].Single();
Assert.Collection(diff2.Edits, edit =>
{
Assert.Equal(RenderTreeEditType.UpdateText, edit.Type);
Assert.Equal(0, edit.SiblingIndex);
AssertFrame.Text(
batch2.ReferenceFrames[edit.ReferenceFrameIndex],
"Hello, Monsieur!");
});
// Assert: The IAuthorizationService was given expected criteria
Assert.Collection(authorizationService.AuthorizeCalls, call =>
{
Assert.Equal("Monsieur", call.user.Identity.Name);
Assert.Null(call.resource);
Assert.Collection(call.requirements,
req => Assert.IsType <DenyAnonymousAuthorizationRequirement>(req));
});
}
public async Task RendersAuthorizingUntilAuthorizationCompletedAsync()
{
// Covers https://github.com/dotnet/aspnetcore/pull/31794
// Arrange
var authorizationService = new TestAsyncAuthorizationService();
authorizationService.NextResult = AuthorizationResult.Success();
var renderer = CreateTestRenderer(authorizationService);
renderer.OnUpdateDisplayComplete = () => { };
var rootComponent = WrapInAuthorizeView(
authorizing: builder => builder.AddContent(0, "Auth pending..."),
authorized: context => builder => builder.AddContent(0, $"Hello, {context.User.Identity.Name}!"));
var authTcs = new TaskCompletionSource <AuthenticationState>();
rootComponent.AuthenticationState = authTcs.Task;
// Act/Assert 1: Auth pending
renderer.AssignRootComponentId(rootComponent);
rootComponent.TriggerRender();
var batch1 = Assert.Single(renderer.Batches);
var authorizeViewComponentId = Assert.Single(batch1.GetComponentFrames <AuthorizeView>()).ComponentId;
var diff1 = Assert.Single(batch1.DiffsByComponentId[authorizeViewComponentId]);
Assert.Collection(diff1.Edits, edit =>
{
Assert.Equal(RenderTreeEditType.PrependFrame, edit.Type);
AssertFrame.Text(
batch1.ReferenceFrames[edit.ReferenceFrameIndex],
"Auth pending...");
});
// We need to do this because the continuation from the TCS might run asynchronously
// (This wouldn't happen under the sync context or in wasm)
var renderTcs = new TaskCompletionSource();
renderer.OnUpdateDisplayComplete = () => renderTcs.SetResult();
authTcs.SetResult(CreateAuthenticationState("Monsieur").Result);
await renderTcs.Task;
Assert.Equal(2, renderer.Batches.Count);
var batch2 = renderer.Batches[1];
var diff2 = Assert.Single(batch2.DiffsByComponentId[authorizeViewComponentId]);
Assert.Collection(diff2.Edits, edit =>
{
Assert.Equal(RenderTreeEditType.UpdateText, edit.Type);
Assert.Equal(0, edit.SiblingIndex);
AssertFrame.Text(
batch2.ReferenceFrames[edit.ReferenceFrameIndex],
"Hello, Monsieur!");
});
// Assert: The IAuthorizationService was given expected criteria
Assert.Collection(authorizationService.AuthorizeCalls, call =>
{
Assert.Equal("Monsieur", call.user.Identity.Name);
Assert.Null(call.resource);
Assert.Collection(call.requirements,
req => Assert.IsType <DenyAnonymousAuthorizationRequirement>(req));
});
}
public void CanChangeLayout()
{
// Arrange
var setParametersTask1 = _renderer.Dispatcher.InvokeAsync(() => _layoutViewComponent.SetParametersAsync(ParameterView.FromDictionary(new Dictionary <string, object>
{
{ nameof(LayoutView.Layout), typeof(NestedLayout) },
{ nameof(LayoutView.ChildContent), (RenderFragment)(builder => {
builder.AddContent(0, "Some content");
}) }
})));
Assert.True(setParametersTask1.IsCompletedSuccessfully);
// Act
var setParametersTask2 = _renderer.Dispatcher.InvokeAsync(() => _layoutViewComponent.SetParametersAsync(ParameterView.FromDictionary(new Dictionary <string, object>
{
{ nameof(LayoutView.Layout), typeof(OtherNestedLayout) },
})));
// Assert
Assert.True(setParametersTask2.IsCompletedSuccessfully);
Assert.Equal(2, _renderer.Batches.Count);
var batch = _renderer.Batches[1];
Assert.Equal(1, batch.DisposedComponentIDs.Count); // Disposes NestedLayout
Assert.Collection(batch.DiffsInOrder,
diff => Assert.Empty(diff.Edits), // LayoutView rerendered, but with no changes
diff =>
{
// RootLayout rerendered, changing child
Assert.Collection(diff.Edits,
edit =>
{
Assert.Equal(RenderTreeEditType.RemoveFrame, edit.Type);
Assert.Equal(1, edit.SiblingIndex);
},
edit =>
{
Assert.Equal(RenderTreeEditType.PrependFrame, edit.Type);
Assert.Equal(1, edit.SiblingIndex);
AssertFrame.Component <OtherNestedLayout>(
batch.ReferenceFrames[edit.ReferenceFrameIndex],
sequence: 0);
});
},
diff =>
{
// Inserts new OtherNestedLayout
Assert.Collection(diff.Edits,
edit =>
{
Assert.Equal(RenderTreeEditType.PrependFrame, edit.Type);
Assert.Equal(0, edit.SiblingIndex);
AssertFrame.Text(
batch.ReferenceFrames[edit.ReferenceFrameIndex],
"OtherNestedLayout starts here");
},
edit =>
{
Assert.Equal(RenderTreeEditType.PrependFrame, edit.Type);
Assert.Equal(1, edit.SiblingIndex);
AssertFrame.Text(
batch.ReferenceFrames[edit.ReferenceFrameIndex],
"Some content");
},
edit =>
{
Assert.Equal(RenderTreeEditType.PrependFrame, edit.Type);
Assert.Equal(2, edit.SiblingIndex);
AssertFrame.Text(
batch.ReferenceFrames[edit.ReferenceFrameIndex],
"OtherNestedLayout ends here");
});
});
}
public void ComponentCanTriggerRenderWhenExistingBatchIsInProgress()
{
// Arrange
var renderer = new TestRenderer();
TestComponent parent = null;
var parentRenderCount = 0;
parent = new TestComponent(builder =>
{
builder.OpenComponent <ReRendersParentComponent>(0);
builder.AddAttribute(1, nameof(ReRendersParentComponent.Parent), parent);
builder.CloseComponent();
builder.AddContent(2, $"Parent render count: {++parentRenderCount}");
});
var parentComponentId = renderer.AssignComponentId(parent);
// Act
parent.TriggerRender();
// Assert
var batch = renderer.Batches.Single();
Assert.Equal(4, batch.DiffsInOrder.Count);
// First is the parent component's initial render
var diff1 = batch.DiffsInOrder[0];
Assert.Equal(parentComponentId, diff1.ComponentId);
Assert.Collection(diff1.Edits,
edit =>
{
Assert.Equal(RenderTreeEditType.PrependFrame, edit.Type);
AssertFrame.Component <ReRendersParentComponent>(
batch.ReferenceFrames[edit.ReferenceFrameIndex]);
},
edit =>
{
Assert.Equal(RenderTreeEditType.PrependFrame, edit.Type);
AssertFrame.Text(
batch.ReferenceFrames[edit.ReferenceFrameIndex],
"Parent render count: 1");
});
// Second is the child component's single render
var diff2 = batch.DiffsInOrder[1];
Assert.NotEqual(parentComponentId, diff2.ComponentId);
var diff2edit = diff2.Edits.Single();
Assert.Equal(RenderTreeEditType.PrependFrame, diff2edit.Type);
AssertFrame.Text(batch.ReferenceFrames[diff2edit.ReferenceFrameIndex],
"Child is here");
// Third is the parent's triggered render
var diff3 = batch.DiffsInOrder[2];
Assert.Equal(parentComponentId, diff3.ComponentId);
var diff3edit = diff3.Edits.Single();
Assert.Equal(RenderTreeEditType.UpdateText, diff3edit.Type);
AssertFrame.Text(batch.ReferenceFrames[diff3edit.ReferenceFrameIndex],
"Parent render count: 2");
// Fourth is child's rerender due to parent rendering
var diff4 = batch.DiffsInOrder[3];
Assert.NotEqual(parentComponentId, diff4.ComponentId);
Assert.Empty(diff4.Edits);
}
public void AllRendersTriggeredSynchronouslyDuringEventHandlerAreHandledAsSingleBatch()
{
// Arrange: A root component with a child whose event handler explicitly queues
// a re-render of both the root component and the child
var renderer = new TestRenderer();
var eventCount = 0;
TestComponent rootComponent = null;
EventComponent childComponent = null;
rootComponent = new TestComponent(builder =>
{
builder.AddContent(0, "Child event count: " + eventCount);
builder.OpenComponent <EventComponent>(1);
builder.AddAttribute(2, nameof(EventComponent.OnTest), args =>
{
eventCount++;
rootComponent.TriggerRender();
childComponent.TriggerRender();
});
builder.CloseComponent();
});
var rootComponentId = renderer.AssignComponentId(rootComponent);
rootComponent.TriggerRender();
var origBatchReferenceFrames = renderer.Batches.Single().ReferenceFrames;
var childComponentFrame = origBatchReferenceFrames
.Single(f => f.Component is EventComponent);
var childComponentId = childComponentFrame.ComponentId;
childComponent = (EventComponent)childComponentFrame.Component;
var origEventHandlerId = origBatchReferenceFrames
.Where(f => f.FrameType == RenderTreeFrameType.Attribute)
.Last(f => f.AttributeEventHandlerId != 0)
.AttributeEventHandlerId;
Assert.Single(renderer.Batches);
// Act
renderer.DispatchEvent(childComponentId, origEventHandlerId, args: null);
// Assert
Assert.Equal(2, renderer.Batches.Count);
var batch = renderer.Batches.Last();
Assert.Collection(batch.DiffsInOrder,
diff =>
{
// First we triggered the root component to re-render
Assert.Equal(rootComponentId, diff.ComponentId);
Assert.Collection(diff.Edits, edit =>
{
Assert.Equal(RenderTreeEditType.UpdateText, edit.Type);
AssertFrame.Text(
batch.ReferenceFrames[edit.ReferenceFrameIndex],
"Child event count: 1");
});
},
diff =>
{
// Then the root re-render will have triggered an update to the child
Assert.Equal(childComponentId, diff.ComponentId);
Assert.Collection(diff.Edits, edit =>
{
Assert.Equal(RenderTreeEditType.UpdateText, edit.Type);
AssertFrame.Text(
batch.ReferenceFrames[edit.ReferenceFrameIndex],
"Render count: 2");
});
},
diff =>
{
// Finally we explicitly requested a re-render of the child
Assert.Equal(childComponentId, diff.ComponentId);
Assert.Collection(diff.Edits, edit =>
{
Assert.Equal(RenderTreeEditType.UpdateText, edit.Type);
AssertFrame.Text(
batch.ReferenceFrames[edit.ReferenceFrameIndex],
"Render count: 3");
});
});
}
public void Render_HtmlBlock_Integration()
{
// Arrange
AdditionalSyntaxTrees.Add(Parse(@"
using Microsoft.AspNetCore.Components;
namespace Test
{
public class MyComponent : ComponentBase
{
[Parameter]
public RenderFragment ChildContent { get; set; }
}
}
"));
var component = CompileToComponent(@"
<html>
<head><meta><meta></head>
<body>
<MyComponent>
<div><span></span><span></span></div>
<div>@(""hi"")</div>
<div><span></span><span></span></div>
<div></div>
<div>@(""hi"")</div>
<div></div>
</MyComponent>
</body>
</html>");
// Act
var frames = GetRenderTree(component);
// Assert: component frames are correct
Assert.Collection(
frames,
frame => AssertFrame.Element(frame, "html", 9, 0),
frame => AssertFrame.MarkupWhitespace(frame, 1),
frame => AssertFrame.Markup(frame, "<head><meta><meta></head>\n ", 2),
frame => AssertFrame.Element(frame, "body", 5, 3),
frame => AssertFrame.MarkupWhitespace(frame, 4),
frame => AssertFrame.Component(frame, "Test.MyComponent", 2, 5),
frame => AssertFrame.Attribute(frame, "ChildContent", 6),
frame => AssertFrame.MarkupWhitespace(frame, 16),
frame => AssertFrame.MarkupWhitespace(frame, 17));
// Assert: Captured ChildContent frames are correct
var childFrames = GetFrames((RenderFragment)frames[6].AttributeValue);
Assert.Collection(
childFrames.AsEnumerable(),
frame => AssertFrame.MarkupWhitespace(frame, 7),
frame => AssertFrame.Markup(frame, "<div><span></span><span></span></div>\n ", 8),
frame => AssertFrame.Element(frame, "div", 2, 9),
frame => AssertFrame.Text(frame, "hi", 10),
frame => AssertFrame.MarkupWhitespace(frame, 11),
frame => AssertFrame.Markup(frame, "<div><span></span><span></span></div>\n <div></div>\n ", 12),
frame => AssertFrame.Element(frame, "div", 2, 13),
frame => AssertFrame.Text(frame, "hi", 14),
frame => AssertFrame.Markup(frame, "\n <div></div>\n ", 15));
}
public void DoesNotNotifyDescendantsOfUpdatedCascadingParameterValuesWhenFixed()
{
// Arrange
var providedValue = "Initial value";
var shouldIncludeChild = true;
var renderer = new TestRenderer();
var component = new TestComponent(builder =>
{
builder.OpenComponent <CascadingValue <string> >(0);
builder.AddAttribute(1, "Value", providedValue);
builder.AddAttribute(2, "IsFixed", true);
builder.AddAttribute(3, "ChildContent", new RenderFragment(childBuilder =>
{
if (shouldIncludeChild)
{
childBuilder.OpenComponent <CascadingParameterConsumerComponent <string> >(0);
childBuilder.AddAttribute(1, "RegularParameter", "Goodbye");
childBuilder.CloseComponent();
}
}));
builder.CloseComponent();
});
// Act 1: Initial render; capture nested component ID
var componentId = renderer.AssignRootComponentId(component);
component.TriggerRender();
var firstBatch = renderer.Batches.Single();
var nestedComponent = FindComponent <CascadingParameterConsumerComponent <string> >(firstBatch, out var nestedComponentId);
Assert.Equal(1, nestedComponent.NumRenders);
// Assert: Initial value is supplied to descendant
var nestedComponentDiff = firstBatch.DiffsByComponentId[nestedComponentId].Single();
Assert.Collection(nestedComponentDiff.Edits, edit =>
{
Assert.Equal(RenderTreeEditType.PrependFrame, edit.Type);
AssertFrame.Text(
firstBatch.ReferenceFrames[edit.ReferenceFrameIndex],
"CascadingParameter=Initial value; RegularParameter=Goodbye");
});
// Act 2: Re-render CascadingValue with new value
providedValue = "Updated value";
component.TriggerRender();
// Assert: We did not re-render the descendant
Assert.Equal(2, renderer.Batches.Count);
var secondBatch = renderer.Batches[1];
Assert.Equal(2, secondBatch.DiffsByComponentId.Count); // Root + CascadingValue, but not nested one
Assert.Equal(1, nestedComponent.NumSetParametersCalls);
Assert.Equal(1, nestedComponent.NumRenders);
// Act 3: Dispose
shouldIncludeChild = false;
component.TriggerRender();
// Assert: Absence of an exception here implies we didn't cause a problem by
// trying to remove a non-existent subscription
}
