#5-1 EpubDocumentのテストを作成中

Epub/KoeBook.Epub/Properties/AssemblyInfo.cs

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+using System.Runtime.CompilerServices;
+
+// PrivateProxyが外部プロジェクトに対応していないため
+[assembly: InternalsVisibleTo("KoeBook.Test")]

KoeBook.Core/Properties/AssemblyInfo.cs

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+using System.Runtime.CompilerServices;
+
+// PrivateProxyが外部プロジェクトに対応していないため
+[assembly: InternalsVisibleTo("KoeBook.Test")]

KoeBook.Test/Epub/EpubDocumentTest.cs

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+using KoeBook.Epub.Models;
+
+namespace KoeBook.Test.Epub;
+
+public class EpubDocumentTest
+{
+    #region Ensure List
+    [Fact]
+    public void EnsureChapter()
+    {
+        var document = new EpubDocument("title", "author", "cover", default);
+
+        Assert.Empty(document.Chapters);
+
+        // 空のときは追加
+        document.EnsureChapter();
+
+        var chapter = Assert.Single(document.Chapters);
+        Assert.Null(chapter.Title);
+        Assert.Empty(chapter.Sections);
+
+        // 空でないときは無視
+        document.EnsureChapter();
+
+        var chapter2 = Assert.Single(document.Chapters);
+        Assert.Same(chapter, chapter2);
+    }
+
+    [Fact]
+    public void EnsureSection()
+    {
+        var document = new EpubDocument("title", "author", "cover", default);
+
+        Assert.Empty(document.Chapters);
+
+        // 空のときは追加される
+        document.EnsureSection(0);
+
+        var chapter = Assert.Single(document.Chapters);
+        Assert.Null(chapter.Title);
+        var section = Assert.Single(chapter.Sections);
+        Assert.Equal("title", section.Title);
+        Assert.Empty(section.Elements);
+
+        // 空でないときは無視
+        document.Chapters = [
+            new()
+            {
+                Title = "chapter1",
+                Sections = [
+                    new("section1"),
+                    new("section2"),
+                    new("section3"),
+                ],
+            },
+            new()
+            {
+                Title = "chapter2",
+                Sections = [],
+            },
+        ];
+
+        document.EnsureSection(0);
+
+        Assert.Equal(3, document.Chapters[0].Sections.Count);
+
+        document.EnsureSection(1);
+
+        Assert.Equal("chapter2", document.Chapters[1].Sections[0].Title);
+
+        // インデックスは正しく指定する必要がある
+        var exception = Record.Exception(() => document.EnsureSection(5));
+
+        Assert.IsType<ArgumentOutOfRangeException>(exception);
+    }
+
+    [Fact]
+    public void EnsureParagraph()
+    {
+        var document = new EpubDocument("title", "author", "cover", default);
+
+        Assert.Empty(document.Chapters);
+
+        // 空のときは追加される
+        document.EnsureParagraph(0, 0);
+
+        var chapter = Assert.Single(document.Chapters);
+        var section = Assert.Single(chapter.Sections);
+        var element = Assert.Single(section.Elements);
+        var paragraph = Assert.IsType<Paragraph>(element);
+        Assert.Null(paragraph.Audio);
+        Assert.Null(paragraph.Text);
+        Assert.Null(paragraph.ClassName);
+
+        // 空でないときは無視
+        document.Chapters = [
+            new()
+            {
+                Title = "chapter1",
+                Sections = [
+                    new("section1")
+                    {
+                        Elements = [
+                            new Paragraph()
+                            {
+                                Text = "paragraph1",
+                            },
+                        ]
+                    },
+                    new("section1")
+                    {
+                        Elements = []
+                    },
+                ],
+            },
+        ];
+
+        document.EnsureParagraph(0, 0);
+
+        chapter = Assert.Single(document.Chapters);
+        Assert.Equal(2, chapter.Sections.Count);
+        section = chapter.Sections[0];
+        element = Assert.Single(section.Elements);
+        paragraph = Assert.IsType<Paragraph>(element);
+        Assert.Equal("paragraph1", paragraph.Text);
+
+        document.EnsureParagraph(0, 1);
+
+        element = Assert.Single(document.Chapters[0].Sections[1].Elements);
+        paragraph = Assert.IsType<Paragraph>(element);
+        Assert.Null(paragraph.Audio);
+        Assert.Null(paragraph.Text);
+        Assert.Null(paragraph.ClassName);
+
+        // インデックスは正しく指定する必要がある
+        var exception = Record.Exception(() => document.EnsureParagraph(0, 5));
+
+        Assert.IsType<ArgumentOutOfRangeException>(exception);
+    }
+    #endregion
+}