303 lines
11 KiB
C#
303 lines
11 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 Microsoft.Blazor.Test.Shared;
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using System;
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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 RenderTreeBuilderTest
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{
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[Fact]
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public void RequiresNonnullRenderer()
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{
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Assert.Throws<ArgumentNullException>(() =>
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{
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new RenderTreeBuilder(null);
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});
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}
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[Fact]
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public void StartsEmpty()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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// Assert
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var nodes = builder.GetNodes();
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Assert.NotNull(nodes.Array);
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Assert.Empty(nodes);
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}
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[Fact]
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public void CanAddText()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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var nullString = (string)null;
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// Act
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builder.AddText(0, "First item");
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builder.AddText(0, nullString);
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builder.AddText(0, "Second item");
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// Assert
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var nodes = builder.GetNodes();
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Assert.Collection(nodes,
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node => AssertNode.Text(node, "First item"),
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node => AssertNode.Text(node, string.Empty),
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node => AssertNode.Text(node, "Second item"));
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}
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[Fact]
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public void CanAddNonStringValueAsText()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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var nullObject = (object)null;
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// Act
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builder.AddText(0, 1234);
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builder.AddText(0, nullObject);
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// Assert
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var nodes = builder.GetNodes();
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Assert.Collection(nodes,
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node => AssertNode.Text(node, "1234"),
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node => AssertNode.Text(node, string.Empty));
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}
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[Fact]
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public void UnclosedElementsHaveNoEndDescendantIndex()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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// Act
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builder.OpenElement(0, "my element");
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// Assert
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var node = builder.GetNodes().Single();
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AssertNode.Element(node, "my element", 0);
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}
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[Fact]
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public void ClosedEmptyElementsHaveSelfAsEndDescendantIndex()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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// Act
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builder.AddText(0, "some node so that the element isn't at position zero");
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builder.OpenElement(0, "my element");
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builder.CloseElement();
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// Assert
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var nodes = builder.GetNodes();
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Assert.Equal(2, nodes.Count);
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AssertNode.Element(nodes.Array[1], "my element", 1);
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}
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[Fact]
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public void ClosedElementsHaveCorrectEndDescendantIndex()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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// Act
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builder.OpenElement(0, "my element");
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builder.AddText(0, "child 1");
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builder.AddText(0, "child 2");
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builder.CloseElement();
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builder.AddText(0, "unrelated item");
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// Assert
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var nodes = builder.GetNodes();
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Assert.Equal(4, nodes.Count);
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AssertNode.Element(nodes.Array[0], "my element", 2);
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}
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[Fact]
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public void CanNestElements()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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// Act
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builder.AddText(0, "standalone text 1"); // 0: standalone text 1
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builder.OpenElement(0, "root"); // 1: <root>
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builder.AddText(0, "root text 1"); // 2: root text 1
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builder.AddText(0, "root text 2"); // 3: root text 2
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builder.OpenElement(0, "child"); // 4: <child>
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builder.AddText(0, "child text"); // 5: child text
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builder.OpenElement(0, "grandchild"); // 6: <grandchild>
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builder.AddText(0, "grandchild text 1"); // 7: grandchild text 1
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builder.AddText(0, "grandchild text 2"); // 8: grandchild text 2
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builder.CloseElement(); // </grandchild>
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builder.CloseElement(); // </child>
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builder.AddText(0, "root text 3"); // 9: root text 3
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builder.OpenElement(0, "child 2"); // 10: <child 2>
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builder.CloseElement(); // </child 2>
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builder.CloseElement(); // </root>
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builder.AddText(0, "standalone text 2"); // 11: standalone text 2
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// Assert
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Assert.Collection(builder.GetNodes(),
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node => AssertNode.Text(node, "standalone text 1"),
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node => AssertNode.Element(node, "root", 10),
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node => AssertNode.Text(node, "root text 1"),
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node => AssertNode.Text(node, "root text 2"),
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node => AssertNode.Element(node, "child", 8),
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node => AssertNode.Text(node, "child text"),
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node => AssertNode.Element(node, "grandchild", 8),
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node => AssertNode.Text(node, "grandchild text 1"),
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node => AssertNode.Text(node, "grandchild text 2"),
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node => AssertNode.Text(node, "root text 3"),
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node => AssertNode.Element(node, "child 2", 10),
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node => AssertNode.Text(node, "standalone text 2"));
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}
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[Fact]
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public void CanAddAttributes()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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UIEventHandler eventHandler = eventInfo => { };
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// Act
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builder.OpenElement(0, "myelement"); // 0: <myelement
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builder.AddAttribute(0, "attribute1", "value 1"); // 1: attribute1="value 1"
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builder.AddAttribute(0, "attribute2", 123); // 2: attribute2=intExpression123>
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builder.OpenElement(0, "child"); // 3: <child
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builder.AddAttribute(0, "childevent", eventHandler); // 4: childevent=eventHandler>
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builder.AddText(0, "some text"); // 5: some text
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builder.CloseElement(); // </child>
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builder.CloseElement(); // </myelement>
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// Assert
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Assert.Collection(builder.GetNodes(),
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node => AssertNode.Element(node, "myelement", 5),
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node => AssertNode.Attribute(node, "attribute1", "value 1"),
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node => AssertNode.Attribute(node, "attribute2", "123"),
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node => AssertNode.Element(node, "child", 5),
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node => AssertNode.Attribute(node, "childevent", eventHandler),
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node => AssertNode.Text(node, "some text"));
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}
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[Fact]
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public void CannotAddAttributeAtRoot()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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// Act/Assert
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Assert.Throws<InvalidOperationException>(() =>
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{
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builder.AddAttribute(0, "name", "value");
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});
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}
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[Fact]
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public void CannotAddEventHandlerAttributeAtRoot()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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// Act/Assert
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Assert.Throws<InvalidOperationException>(() =>
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{
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builder.AddAttribute(0, "name", eventInfo => { });
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});
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}
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[Fact]
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public void CannotAddAttributeToText()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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// Act/Assert
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Assert.Throws<InvalidOperationException>(() =>
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{
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builder.OpenElement(0, "some element");
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builder.AddText(1, "hello");
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builder.AddAttribute(2, "name", "value");
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});
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}
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[Fact]
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public void CannotAddEventHandlerAttributeToText()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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// Act/Assert
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Assert.Throws<InvalidOperationException>(() =>
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{
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builder.OpenElement(0, "some element");
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builder.AddText(1, "hello");
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builder.AddAttribute(2, "name", eventInfo => { });
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});
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}
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[Fact]
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public void CanAddChildComponents()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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// Act
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builder.OpenElement(10, "parent"); // 0: <parent>
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builder.AddComponent<TestComponent>(11); // 1: <testcomponent
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builder.AddAttribute(12, "child1attribute1", "A"); // 2: child1attribute1="A"
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builder.AddAttribute(13, "child1attribute2", "B"); // 3: child1attribute2="B" />
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builder.AddComponent<TestComponent>(14); // 4: <testcomponent
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builder.AddAttribute(15, "child2attribute", "C"); // 5: child2attribute="C" />
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builder.CloseElement(); // </parent>
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// Assert
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Assert.Collection(builder.GetNodes(),
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node => AssertNode.Element(node, "parent", 5),
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node => AssertNode.Component<TestComponent>(node),
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node => AssertNode.Attribute(node, "child1attribute1", "A"),
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node => AssertNode.Attribute(node, "child1attribute2", "B"),
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node => AssertNode.Component<TestComponent>(node),
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node => AssertNode.Attribute(node, "child2attribute", "C"));
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}
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[Fact]
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public void CanClear()
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{
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// Arrange
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var builder = new RenderTreeBuilder(new TestRenderer());
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// Act
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builder.AddText(0, "some text");
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builder.OpenElement(1, "elem");
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builder.AddText(2, "more text");
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builder.CloseElement();
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builder.Clear();
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// Assert
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Assert.Empty(builder.GetNodes());
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}
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private class TestComponent : IComponent
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{
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public void BuildRenderTree(RenderTreeBuilder builder)
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=> throw new NotImplementedException();
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}
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private class TestRenderer : Renderer
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{
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protected internal override void UpdateDisplay(int componentId, RenderTreeDiff renderTreeDiff)
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=> throw new NotImplementedException();
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}
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}
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}
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