Kavita/Kavita.Common.Tests/Helpers/HtmlHelperTests.cs

using Kavita.Common.Helpers;

namespace Kavita.Common.Tests.Helpers;

public class HtmlHelperTests
{
    #region GetCharacters Tests

    [Fact]
    public void GetCharacters_WithNullBody_ReturnsNull()
    {

        string body = null;

        // Act
        var result = HtmlHelper.GetCharacters(body);

        // Assert
        Assert.Null(result);
    }

    [Fact]
    public void GetCharacters_WithEmptyBody_ReturnsEmptyString()
    {

        var body = string.Empty;

        // Act
        var result = HtmlHelper.GetCharacters(body);

        // Assert
        Assert.Equal(string.Empty, result);
    }

    [Fact]
    public void GetCharacters_WithNoTextNodes_ReturnsEmptyString()
    {

        const string body = "<div></div>";

        // Act
        var result = HtmlHelper.GetCharacters(body);

        // Assert
        Assert.Equal(string.Empty, result);
    }

    [Fact]
    public void GetCharacters_WithLessCharactersThanLimit_ReturnsFullText()
    {

        var body = "<p>This is a short review.</p>";

        // Act
        var result = HtmlHelper.GetCharacters(body);

        // Assert
        Assert.Equal("This is a short review.…", result);
    }

    [Fact]
    public void GetCharacters_WithMoreCharactersThanLimit_TruncatesText()
    {

        var body = "<p>" + new string('a', 200) + "</p>";

        // Act
        var result = HtmlHelper.GetCharacters(body);

        // Assert
        Assert.Equal(new string('a', 175) + "…", result);
        Assert.Equal(176, result.Length); // 175 characters + ellipsis
    }

    [Fact]
    public void GetCharacters_IgnoresScriptTags()
    {

        const string body = "<p>Visible text</p><script>console.log('hidden');</script>";

        // Act
        var result = HtmlHelper.GetCharacters(body);

        // Assert
        Assert.Equal("Visible text…", result);
        Assert.DoesNotContain("hidden", result);
    }

    [Fact]
    public void GetCharacters_RemovesMarkdownSymbols()
    {

        const string body = "<p>This is **bold** and _italic_ text with [link](url).</p>";

        // Act
        var result = HtmlHelper.GetCharacters(body);

        // Assert
        Assert.Equal("This is bold and italic text with link.…", result);
    }

    [Fact]
    public void GetCharacters_HandlesComplexMarkdownAndHtml()
    {

        const string body = """

                                        <div>
                                            <h1># Header</h1>
                                            <p>This is ~~strikethrough~~ and __underlined__ text</p>
                                            <p>~~~code block~~~</p>
                                            <p>+++highlighted+++</p>
                                            <p>img123(image.jpg)</p>
                                        </div>
                            """;

        // Act
        var result = HtmlHelper.GetCharacters(body);

        // Assert
        Assert.DoesNotContain("~~", result);
        Assert.DoesNotContain("__", result);
        Assert.DoesNotContain("~~~", result);
        Assert.DoesNotContain("+++", result);
        Assert.DoesNotContain("img123(", result);
        Assert.Contains("Header", result);
        Assert.Contains("strikethrough", result);
        Assert.Contains("underlined", result);
        Assert.Contains("code block", result);
        Assert.Contains("highlighted", result);
    }

    #endregion
}