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Add unit tests for LinkLabel #12572

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merged 3 commits into from
Dec 4, 2024
Merged

Add unit tests for LinkLabel #12572

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Add unit tests for LinkLabel
Olina-Zhang Dec 2, 2024
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Olina-Zhang Dec 3, 2024
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Olina-Zhang Dec 4, 2024
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246 changes: 240 additions & 6 deletions src/System.Windows.Forms/tests/UnitTests/LinkLabelTests.cs
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Original file line number Diff line number Diff line change
@@ -1,18 +1,252 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

#nullable enable

using System.Drawing;

namespace System.Windows.Forms.Tests;

public class LinkLabelTests
public class LinkLabelTests : IDisposable
{
private readonly LinkLabel _linkLabel = new();

public void Dispose() => _linkLabel.Dispose();

[WinFormsFact]
public void LinkLabel_Constructor()
{
using LinkLabel label = new();
_linkLabel.Should().NotBeNull();
_linkLabel.LinkArea.IsEmpty.Should().BeTrue();
_linkLabel.LinkArea.Start.Should().Be(0);
_linkLabel.LinkArea.Length.Should().Be(0);
}

[WinFormsFact]
public void LinkLabel_FlatStyle_Get_ReturnsExpected()
{
_linkLabel.FlatStyle.Should().Be(FlatStyle.Standard);
}

[WinFormsTheory]
[InlineData(FlatStyle.Flat)]
[InlineData(FlatStyle.Popup)]
[InlineData(FlatStyle.System)]
public void LinkLabel_FlatStyle_Set_ReturnsExpected(FlatStyle flatStyle)
{
_linkLabel.FlatStyle = flatStyle;

_linkLabel.FlatStyle.Should().Be(flatStyle);
}

[WinFormsFact]
public void LinkLabel_LinkArea_Get_ReturnsExpected()
{
_linkLabel.LinkArea.Should().Be(new LinkArea(0, 0));
}

[WinFormsFact]
public void LinkLabel_LinkArea_Set_ReturnsExpected()
{
LinkArea linkArea1 = new LinkArea(1, 2);
LinkArea linkArea2 = new LinkArea(3, 4);

_linkLabel.LinkArea = linkArea1;
_linkLabel.LinkArea.Should().Be(linkArea1);

_linkLabel.LinkArea = linkArea2;
_linkLabel.LinkArea.Should().Be(linkArea2);
}

[WinFormsTheory]
[InlineData(-1, 2)] // Test with negative Start
[InlineData(1, -2)] // Test with negative Length
public void LinkLabel_LinkArea_Set_InvalidValues_ThrowsArgumentOutOfRangeException(int start, int length)
{
Action act = () => _linkLabel.LinkArea = new LinkArea(start, length);
act.Should().Throw<ArgumentOutOfRangeException>().WithMessage("*LinkArea*");
}

[WinFormsFact]
public void LinkLabel_LinkArea_Set_UpdatesSelectability()
{
_linkLabel.Text = "Text";
_linkLabel.LinkArea = new LinkArea(1, 2);
_linkLabel.TabStop.Should().BeTrue();

_linkLabel.LinkArea = new LinkArea(0, 0);
_linkLabel.TabStop.Should().BeFalse();
}

[WinFormsFact]
public void LinkLabel_LinkBehavior_Get_ReturnsExpected()
{
_linkLabel.LinkBehavior.Should().Be(LinkBehavior.SystemDefault);
}

[WinFormsTheory]
[InlineData(LinkBehavior.AlwaysUnderline)]
[InlineData(LinkBehavior.HoverUnderline)]
[InlineData(LinkBehavior.NeverUnderline)]
public void LinkLabel_LinkBehavior_Set_ReturnsExpected(LinkBehavior linkBehavior)
{
_linkLabel.LinkBehavior = linkBehavior;
_linkLabel.LinkBehavior.Should().Be(linkBehavior);
}

[WinFormsFact]
public void LinkLabel_LinkVisited_Get_ReturnsExpected()
{
_linkLabel.LinkVisited.Should().BeFalse();
}

[WinFormsTheory]
[InlineData(true)]
[InlineData(false)]
public void LinkLabel_LinkVisited_Set_ReturnsExpected(bool expectedVisited)
{
_linkLabel.LinkVisited = expectedVisited;
_linkLabel.LinkVisited.Should().Be(expectedVisited);
}

[WinFormsFact]
public void LinkLabel_LinkVisited_Set_AddsLinkIfNoneExists()
{
_linkLabel.LinkVisited = true;
_linkLabel.Links.Count.Should().Be(1);
_linkLabel.Links[0].Visited.Should().BeTrue();
}

[WinFormsFact]
public void LinkLabel_LinkVisited_Set_UpdatesExistingLink()
{
_linkLabel.Links.Add(new LinkLabel.Link(_linkLabel) { Visited = false });
_linkLabel.LinkVisited = true;
_linkLabel.Links[0].Visited.Should().BeTrue();

_linkLabel.LinkVisited = false;
_linkLabel.Links[0].Visited.Should().BeFalse();
}

[WinFormsFact]
public void LinkLabel_TabStop_Get_ReturnsExpected()
{
_linkLabel.TabStop.Should().BeFalse();
}

[WinFormsTheory]
[InlineData(true)]
[InlineData(false)]
public void LinkLabel_TabStop_Set_ReturnsExpected(bool expectedTabStop)
{
_linkLabel.TabStop = expectedTabStop;
_linkLabel.TabStop.Should().Be(expectedTabStop);
}

[WinFormsFact]
public void LinkLabel_TabStop_Set_RaisesTabStopChangedEvent()
{
bool eventRaised = false;
_linkLabel.TabStopChanged += (sender, e) => eventRaised = true;

_linkLabel.TabStop = true;
eventRaised.Should().BeTrue();

eventRaised = false;
_linkLabel.TabStop = false;
eventRaised.Should().BeTrue();
}

[WinFormsFact]
public void LinkLabel_Padding_Get_ReturnsExpected()
{
_linkLabel.Padding.Should().Be(new Padding(0));
}

[WinFormsFact]
public void LinkLabel_Padding_Set_ReturnsExpected()
{
Padding padding1 = new(1, 2, 3, 4);
Padding padding2 = new(5);

_linkLabel.Padding = padding1;
_linkLabel.Padding.Should().Be(padding1);

_linkLabel.Padding = padding2;
_linkLabel.Padding.Should().Be(padding2);
}

[WinFormsFact]
public void LinkLabel_VisitedLinkColor_Get_ReturnsExpected()
{
_linkLabel.VisitedLinkColor.Should().Be(LinkUtilities.GetVisitedLinkColor());
}

Assert.NotNull(label);
Assert.True(label.LinkArea.IsEmpty);
Assert.Equal(0, label.LinkArea.Start);
Assert.Equal(0, label.LinkArea.Length);
[WinFormsFact]
public void LinkLabel_VisitedLinkColor_Set_ReturnsExpected()
{
_linkLabel.VisitedLinkColor = Color.Red;
_linkLabel.VisitedLinkColor.Should().Be(Color.Red);

_linkLabel.VisitedLinkColor = Color.Blue;
_linkLabel.VisitedLinkColor.Should().Be(Color.Blue);
}

[WinFormsFact]
public void LinkLabel_VisitedLinkColor_Set_UpdatesLink()
{
_linkLabel.Links.Add(new LinkLabel.Link(_linkLabel) { Visited = true });
_linkLabel.VisitedLinkColor = Color.Red;
_linkLabel.VisitedLinkColor.Should().Be(Color.Red);
}

[WinFormsFact]
public void LinkLabel_LinkClicked_RaisesEvent()
{
using TestLinkLabel label = new();
bool eventRaised = false;
label.LinkClicked += (sender, e) => eventRaised = true;

var link = new LinkLabel.Link(label);
label.Links.Add(link);
label.OnLinkClicked(new LinkLabelLinkClickedEventArgs(link));

eventRaised.Should().BeTrue();
}

[WinFormsFact]
public void LinkLabel_UseCompatibleTextRendering_Get_ReturnsExpected()
{
_linkLabel.UseCompatibleTextRendering.Should().BeTrue();
}

[WinFormsTheory]
[InlineData(true)]
[InlineData(false)]
public void LinkLabel_UseCompatibleTextRendering_Set_ReturnsExpected(bool expectedValue)
{
_linkLabel.UseCompatibleTextRendering = expectedValue;
_linkLabel.UseCompatibleTextRendering.Should().Be(expectedValue);
}

[WinFormsFact]
public void LinkLabel_UseCompatibleTextRendering_Set_TriggersLayout()
{
bool layoutCalled = false;
_linkLabel.Layout += (sender, e) => layoutCalled = true;

_linkLabel.UseCompatibleTextRendering = true;
_linkLabel.PerformLayout();
layoutCalled.Should().BeTrue();

layoutCalled = false;
_linkLabel.UseCompatibleTextRendering = false;
_linkLabel.PerformLayout();
layoutCalled.Should().BeTrue();
}

private class TestLinkLabel : LinkLabel
{
public new void OnLinkClicked(LinkLabelLinkClickedEventArgs e) => base.OnLinkClicked(e);
}
}