745 lines
30 KiB
C#
745 lines
30 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using Microsoft.Blazor.Components;
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using Microsoft.Blazor.Rendering;
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using Microsoft.Blazor.RenderTree;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using Xunit;
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namespace Microsoft.Blazor.Test
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{
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public class RenderTreeDiffComputerTest
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{
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[Theory]
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[MemberData(nameof(RecognizesEquivalentNodesAsSameCases))]
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public void RecognizesEquivalentNodesAsSame(Action<RenderTreeBuilder> appendAction)
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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appendAction(oldTree);
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appendAction(newTree);
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Empty(result.Edits);
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}
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public static IEnumerable<object[]> RecognizesEquivalentNodesAsSameCases()
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=> new Action<RenderTreeBuilder>[]
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{
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builder => builder.AddText(0, "Hello"),
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builder => builder.OpenElement(0, "Some Element"),
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builder =>
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{
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builder.OpenElement(0, "Some Element");
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builder.AddAttribute(1, "My attribute", "My value");
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builder.CloseElement();
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},
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builder => builder.OpenComponentElement<FakeComponent>(0)
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}.Select(x => new object[] { x });
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[Fact]
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public void RecognizesNewItemsBeingInserted()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.AddText(0, "text0");
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oldTree.AddText(2, "text2");
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newTree.AddText(0, "text0");
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newTree.AddText(1, "text1");
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newTree.AddText(2, "text2");
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.PrependNode, 1);
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Assert.Equal(1, entry.NewTreeIndex);
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});
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}
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[Fact]
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public void RecognizesOldItemsBeingRemoved()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.AddText(0, "text0");
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oldTree.AddText(1, "text1");
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oldTree.AddText(2, "text2");
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newTree.AddText(0, "text0");
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newTree.AddText(2, "text2");
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry => AssertEdit(entry, RenderTreeEditType.RemoveNode, 1));
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}
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[Fact]
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public void RecognizesTrailingSequenceWithinLoopBlockBeingRemoved()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.AddText(0, "x"); // Loop start
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oldTree.AddText(1, "x"); // Will be removed
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oldTree.AddText(2, "x"); // Will be removed
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oldTree.AddText(0, "x"); // Loop start
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newTree.AddText(0, "x"); // Loop start
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newTree.AddText(0, "x"); // Loop start
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry => AssertEdit(entry, RenderTreeEditType.RemoveNode, 1),
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entry => AssertEdit(entry, RenderTreeEditType.RemoveNode, 1));
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}
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[Fact]
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public void RecognizesTrailingSequenceWithinLoopBlockBeingAppended()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.AddText(0, "x"); // Loop start
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oldTree.AddText(0, "x"); // Loop start
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newTree.AddText(0, "x"); // Loop start
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newTree.AddText(1, "x"); // Will be added
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newTree.AddText(2, "x"); // Will be added
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newTree.AddText(0, "x"); // Loop start
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.PrependNode, 1);
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Assert.Equal(1, entry.NewTreeIndex);
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},
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.PrependNode, 2);
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Assert.Equal(2, entry.NewTreeIndex);
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});
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}
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[Fact]
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public void RecognizesTrailingLoopBlockBeingRemoved()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.AddText(0, "x");
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oldTree.AddText(1, "x");
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oldTree.AddText(0, "x"); // Will be removed
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oldTree.AddText(1, "x"); // Will be removed
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newTree.AddText(0, "x");
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newTree.AddText(1, "x");
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry => AssertEdit(entry, RenderTreeEditType.RemoveNode, 2),
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entry => AssertEdit(entry, RenderTreeEditType.RemoveNode, 2));
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}
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[Fact]
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public void RecognizesTrailingLoopBlockBeingAdded()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.AddText(0, "x");
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oldTree.AddText(1, "x");
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newTree.AddText(0, "x");
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newTree.AddText(1, "x");
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newTree.AddText(0, "x"); // Will be added
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newTree.AddText(1, "x"); // Will be added
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.PrependNode, 2);
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Assert.Equal(2, entry.NewTreeIndex);
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},
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.PrependNode, 3);
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Assert.Equal(3, entry.NewTreeIndex);
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});
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}
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[Fact]
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public void RecognizesLeadingLoopBlockItemsBeingAdded()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.AddText(2, "x");
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oldTree.AddText(2, "x"); // Note that the '0' and '1' items are not present on this iteration
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newTree.AddText(2, "x");
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newTree.AddText(0, "x");
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newTree.AddText(1, "x");
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newTree.AddText(2, "x");
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.PrependNode, 1);
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Assert.Equal(1, entry.NewTreeIndex);
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},
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.PrependNode, 2);
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Assert.Equal(2, entry.NewTreeIndex);
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});
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}
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[Fact]
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public void RecognizesLeadingLoopBlockItemsBeingRemoved()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.AddText(2, "x");
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oldTree.AddText(0, "x");
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oldTree.AddText(1, "x");
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oldTree.AddText(2, "x");
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newTree.AddText(2, "x");
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newTree.AddText(2, "x"); // Note that the '0' and '1' items are not present on this iteration
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry => AssertEdit(entry, RenderTreeEditType.RemoveNode, 1),
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entry => AssertEdit(entry, RenderTreeEditType.RemoveNode, 1));
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}
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[Fact]
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public void HandlesAdjacentItemsBeingRemovedAndInsertedAtOnce()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.AddText(0, "text");
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newTree.AddText(1, "text");
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry => AssertEdit(entry, RenderTreeEditType.RemoveNode, 0),
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entry => AssertEdit(entry, RenderTreeEditType.PrependNode, 0));
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}
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[Fact]
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public void RecognizesTextUpdates()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.AddText(123, "old text 1");
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oldTree.AddText(182, "old text 2");
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newTree.AddText(123, "new text 1");
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newTree.AddText(182, "new text 2");
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.UpdateText, 0);
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Assert.Equal(0, entry.NewTreeIndex);
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},
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.UpdateText, 1);
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Assert.Equal(1, entry.NewTreeIndex);
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});
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}
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[Fact]
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public void RecognizesElementNameChangesAtSameSequenceNumber()
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{
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// Note: It's not possible to trigger this scenario from a Razor component, because
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// a given source sequence can only have a single fixed element name. We might later
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// decide just to throw in this scenario, since it's unnecessary to support it.
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.OpenElement(123, "old element");
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oldTree.CloseElement();
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newTree.OpenElement(123, "new element");
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newTree.CloseElement();
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.PrependNode, 0);
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Assert.Equal(0, entry.NewTreeIndex);
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},
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entry => AssertEdit(entry, RenderTreeEditType.RemoveNode, 1));
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}
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[Fact]
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public void RecognizesComponentTypeChangesAtSameSequenceNumber()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.OpenComponentElement<FakeComponent>(123);
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newTree.OpenComponentElement<FakeComponent2>(123);
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.PrependNode, 0);
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Assert.Equal(0, entry.NewTreeIndex);
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},
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entry => AssertEdit(entry, RenderTreeEditType.RemoveNode, 1));
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}
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[Fact]
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public void RecognizesAttributesAdded()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.OpenElement(0, "My element");
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oldTree.AddAttribute(1, "existing", "existing value");
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oldTree.CloseElement();
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newTree.OpenElement(0, "My element");
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newTree.AddAttribute(1, "existing", "existing value");
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newTree.AddAttribute(2, "added", "added value");
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newTree.CloseElement();
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.SetAttribute, 0);
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Assert.Equal(2, entry.NewTreeIndex);
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});
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}
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[Fact]
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public void RecognizesAttributesRemoved()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.OpenElement(0, "My element");
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oldTree.AddAttribute(1, "will be removed", "will be removed value");
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oldTree.AddAttribute(2, "will survive", "surviving value");
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oldTree.CloseElement();
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newTree.OpenElement(0, "My element");
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newTree.AddAttribute(2, "will survive", "surviving value");
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newTree.CloseElement();
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.RemoveAttribute, 0);
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Assert.Equal("will be removed", entry.RemovedAttributeName);
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});
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}
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[Fact]
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public void RecognizesAttributeStringValuesChanged()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.OpenElement(0, "My element");
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oldTree.AddAttribute(1, "will remain", "will remain value");
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oldTree.AddAttribute(2, "will change", "will change value");
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oldTree.CloseElement();
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newTree.OpenElement(0, "My element");
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newTree.AddAttribute(1, "will remain", "will remain value");
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newTree.AddAttribute(2, "will change", "did change value");
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newTree.CloseElement();
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.SetAttribute, 0);
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Assert.Equal(2, entry.NewTreeIndex);
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});
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}
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[Fact]
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public void RecognizesAttributeEventHandlerValuesChanged()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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UIEventHandler retainedHandler = _ => { };
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UIEventHandler removedHandler = _ => { };
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UIEventHandler addedHandler = _ => { };
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oldTree.OpenElement(0, "My element");
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oldTree.AddAttribute(1, "will remain", retainedHandler);
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oldTree.AddAttribute(2, "will change", removedHandler);
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oldTree.CloseElement();
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newTree.OpenElement(0, "My element");
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newTree.AddAttribute(1, "will remain", retainedHandler);
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newTree.AddAttribute(2, "will change", addedHandler);
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newTree.CloseElement();
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.SetAttribute, 0);
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Assert.Equal(2, entry.NewTreeIndex);
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});
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}
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[Fact]
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public void RecognizesAttributeNamesChangedAtSameSourceSequence()
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{
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// Arrange
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var renderer = new FakeRenderer();
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var oldTree = new RenderTreeBuilder(renderer);
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var newTree = new RenderTreeBuilder(renderer);
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var diff = new RenderTreeDiffComputer(renderer);
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oldTree.OpenElement(0, "My element");
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oldTree.AddAttribute(1, "oldname", "same value");
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oldTree.CloseElement();
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newTree.OpenElement(0, "My element");
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newTree.AddAttribute(1, "newname", "same value");
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newTree.CloseElement();
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// Act
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var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
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// Assert
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Assert.Collection(result.Edits,
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.SetAttribute, 0);
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Assert.Equal(1, entry.NewTreeIndex);
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},
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entry =>
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{
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AssertEdit(entry, RenderTreeEditType.RemoveAttribute, 0);
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Assert.Equal("oldname", entry.RemovedAttributeName);
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});
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}
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|
|
|
[Fact]
|
|
public void DiffsElementsHierarchically()
|
|
{
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|
// Arrange
|
|
var renderer = new FakeRenderer();
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|
var oldTree = new RenderTreeBuilder(renderer);
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|
var newTree = new RenderTreeBuilder(renderer);
|
|
var diff = new RenderTreeDiffComputer(renderer);
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|
oldTree.AddText(09, "unrelated");
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|
oldTree.OpenElement(10, "root");
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|
oldTree.OpenElement(11, "child");
|
|
oldTree.OpenElement(12, "grandchild");
|
|
oldTree.AddText(13, "grandchild old text");
|
|
oldTree.CloseElement();
|
|
oldTree.CloseElement();
|
|
oldTree.CloseElement();
|
|
|
|
newTree.AddText(09, "unrelated");
|
|
newTree.OpenElement(10, "root");
|
|
newTree.OpenElement(11, "child");
|
|
newTree.OpenElement(12, "grandchild");
|
|
newTree.AddText(13, "grandchild new text");
|
|
newTree.CloseElement();
|
|
newTree.CloseElement();
|
|
newTree.CloseElement();
|
|
|
|
// Act
|
|
var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
|
|
|
|
// Assert
|
|
Assert.Collection(result.Edits,
|
|
entry => AssertEdit(entry, RenderTreeEditType.StepIn, 1),
|
|
entry => AssertEdit(entry, RenderTreeEditType.StepIn, 0),
|
|
entry => AssertEdit(entry, RenderTreeEditType.StepIn, 0),
|
|
entry =>
|
|
{
|
|
AssertEdit(entry, RenderTreeEditType.UpdateText, 0);
|
|
Assert.Equal(4, entry.NewTreeIndex);
|
|
},
|
|
entry => AssertEdit(entry, RenderTreeEditType.StepOut, 0),
|
|
entry => AssertEdit(entry, RenderTreeEditType.StepOut, 0),
|
|
entry => AssertEdit(entry, RenderTreeEditType.StepOut, 0));
|
|
}
|
|
|
|
[Fact]
|
|
public void SkipsUnmodifiedSubtrees()
|
|
{
|
|
// Arrange
|
|
var renderer = new FakeRenderer();
|
|
var oldTree = new RenderTreeBuilder(renderer);
|
|
var newTree = new RenderTreeBuilder(renderer);
|
|
var diff = new RenderTreeDiffComputer(renderer);
|
|
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 = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
|
|
|
|
// Assert
|
|
Assert.Collection(result.Edits,
|
|
entry => AssertEdit(entry, RenderTreeEditType.StepIn, 0),
|
|
entry =>
|
|
{
|
|
AssertEdit(entry, RenderTreeEditType.UpdateText, 0);
|
|
Assert.Equal(1, entry.NewTreeIndex);
|
|
},
|
|
entry => AssertEdit(entry, RenderTreeEditType.StepOut, 0));
|
|
}
|
|
|
|
[Fact]
|
|
public void SkipsUnmodifiedTrailingSiblings()
|
|
{
|
|
// Arrange
|
|
var renderer = new FakeRenderer();
|
|
var oldTree = new RenderTreeBuilder(renderer);
|
|
var newTree = new RenderTreeBuilder(renderer);
|
|
var diff = new RenderTreeDiffComputer(renderer);
|
|
oldTree.AddText(10, "text1");
|
|
oldTree.AddText(11, "text2");
|
|
oldTree.AddText(12, "text3");
|
|
oldTree.AddText(13, "text4");
|
|
newTree.AddText(10, "text1");
|
|
newTree.AddText(11, "text2modified");
|
|
newTree.AddText(12, "text3");
|
|
newTree.AddText(13, "text4");
|
|
|
|
// Act
|
|
var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
|
|
|
|
// Assert
|
|
Assert.Collection(result.Edits,
|
|
entry =>
|
|
{
|
|
AssertEdit(entry, RenderTreeEditType.UpdateText, 1);
|
|
Assert.Equal(1, entry.NewTreeIndex);
|
|
});
|
|
}
|
|
|
|
[Fact]
|
|
public void InstantiatesChildComponentsForInsertedNodes()
|
|
{
|
|
// Arrange
|
|
var renderer = new FakeRenderer();
|
|
var oldTree = new RenderTreeBuilder(renderer);
|
|
var newTree = new RenderTreeBuilder(renderer);
|
|
var diff = new RenderTreeDiffComputer(renderer);
|
|
oldTree.AddText(10, "text1"); // 0: text1
|
|
oldTree.OpenElement(11, "container"); // 1: <container>
|
|
oldTree.CloseElement(); // </container>
|
|
newTree.AddText(10, "text1"); // 0: text1
|
|
newTree.OpenElement(11, "container"); // 1: <container>
|
|
newTree.OpenComponentElement<FakeComponent>(12); // 2: <FakeComponent>
|
|
newTree.CloseElement(); // </FakeComponent>
|
|
newTree.OpenComponentElement<FakeComponent2>(13); // 3: <FakeComponent2>
|
|
newTree.CloseElement(); // </FakeComponent2>
|
|
newTree.CloseElement(); // </container>
|
|
|
|
// Act
|
|
var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
|
|
|
|
// Assert
|
|
Assert.Collection(result.Edits,
|
|
entry => AssertEdit(entry, RenderTreeEditType.StepIn, 1),
|
|
entry =>
|
|
{
|
|
AssertEdit(entry, RenderTreeEditType.PrependNode, 0);
|
|
Assert.Equal(2, entry.NewTreeIndex);
|
|
|
|
var newTreeNode = newTree.GetNodes().Array[entry.NewTreeIndex];
|
|
Assert.Equal(0, newTreeNode.ComponentId);
|
|
Assert.IsType<FakeComponent>(newTreeNode.Component);
|
|
},
|
|
entry =>
|
|
{
|
|
AssertEdit(entry, RenderTreeEditType.PrependNode, 1);
|
|
Assert.Equal(3, entry.NewTreeIndex);
|
|
|
|
var newTreeNode = newTree.GetNodes().Array[entry.NewTreeIndex];
|
|
Assert.Equal(1, newTreeNode.ComponentId);
|
|
Assert.IsType<FakeComponent2>(newTreeNode.Component);
|
|
},
|
|
entry => AssertEdit(entry, RenderTreeEditType.StepOut, 0));
|
|
}
|
|
|
|
[Fact]
|
|
public void RetainsChildComponentsForExistingNodes()
|
|
{
|
|
// Arrange
|
|
var renderer = new FakeRenderer();
|
|
var oldTree = new RenderTreeBuilder(renderer);
|
|
var newTree = new RenderTreeBuilder(renderer);
|
|
var diff = new RenderTreeDiffComputer(renderer);
|
|
oldTree.AddText(10, "text1"); // 0: text1
|
|
oldTree.OpenElement(11, "container"); // 1: <container>
|
|
oldTree.OpenComponentElement<FakeComponent>(12); // 2: <FakeComponent>
|
|
oldTree.CloseElement(); // </FakeComponent>
|
|
oldTree.OpenComponentElement<FakeComponent2>(13); // 3: <FakeComponent2>
|
|
oldTree.CloseElement(); // </FakeComponent2>
|
|
oldTree.CloseElement(); // </container
|
|
newTree.AddText(10, "text1"); // 0: text1
|
|
newTree.OpenElement(11, "container"); // 1: <container>
|
|
newTree.OpenComponentElement<FakeComponent>(12); // 2: <FakeComponent>
|
|
newTree.CloseElement(); // </FakeComponent>
|
|
newTree.OpenComponentElement<FakeComponent2>(13); // 3: <FakeComponent2>
|
|
newTree.CloseElement(); // </FakeComponent2>
|
|
newTree.CloseElement(); // </container
|
|
|
|
diff.ApplyNewRenderTreeVersion(new RenderTreeBuilder(renderer).GetNodes(), oldTree.GetNodes());
|
|
var originalFakeComponentInstance = oldTree.GetNodes().Array[2].Component;
|
|
var originalFakeComponent2Instance = oldTree.GetNodes().Array[3].Component;
|
|
|
|
// Act
|
|
var result = diff.ApplyNewRenderTreeVersion(oldTree.GetNodes(), newTree.GetNodes());
|
|
var newNode1 = newTree.GetNodes().Array[2];
|
|
var newNode2 = newTree.GetNodes().Array[3];
|
|
|
|
// Assert
|
|
Assert.Empty(result.Edits);
|
|
Assert.Equal(0, newNode1.ComponentId);
|
|
Assert.Equal(1, newNode2.ComponentId);
|
|
Assert.Same(originalFakeComponentInstance, newNode1.Component);
|
|
Assert.Same(originalFakeComponent2Instance, newNode2.Component);
|
|
}
|
|
|
|
private class FakeRenderer : Renderer
|
|
{
|
|
internal protected override void UpdateDisplay(int componentId, RenderTreeDiff renderTreeDiff)
|
|
=> throw new NotImplementedException();
|
|
}
|
|
|
|
private class FakeComponent : IComponent
|
|
{
|
|
public void BuildRenderTree(RenderTreeBuilder builder)
|
|
=> throw new NotImplementedException();
|
|
}
|
|
|
|
private class FakeComponent2 : IComponent
|
|
{
|
|
public void BuildRenderTree(RenderTreeBuilder builder)
|
|
=> throw new NotImplementedException();
|
|
}
|
|
|
|
private static void AssertEdit(
|
|
RenderTreeEdit edit,
|
|
RenderTreeEditType type,
|
|
int siblingIndex)
|
|
{
|
|
Assert.Equal(type, edit.Type);
|
|
Assert.Equal(siblingIndex, edit.SiblingIndex);
|
|
}
|
|
}
|
|
}
|