Add home hero with intro and buttons from the body, next-event card and page tiles

Elternbeirat.Web.Tests/HomeIntroTests.cs

@@ -0,0 +1,67 @@
+using Elternbeirat.Web.Features.Home;
+
+namespace Elternbeirat.Web.Tests;
+
+/// <summary>
+/// Unit tests for taking the home page's body apart into heading, intro and
+/// buttons. Pure logic, no PocketBase needed.
+/// </summary>
+public class HomeIntroTests
+{
+    [Fact]
+    public void Body_splits_into_title_intro_and_buttons()
+    {
+        var intro = HomeIntro.Parse(
+            "# Willkommen\n\nSchön, dass Sie da sind.\n\n[Kommende Termine](/events)\n[Kontakt aufnehmen](/contact)");
+
+        intro.Title.ShouldBe("Willkommen");
+        intro.IntroHtml.ShouldBe("<p>Schön, dass Sie da sind.</p>\n");
+        intro.Links.ShouldBe(
+        [
+            new HomeLink("/events", "Kommende Termine"),
+            new HomeLink("/contact", "Kontakt aufnehmen"),
+        ]);
+    }
+
+    [Theory]
+    [InlineData(null)]
+    [InlineData("")]
+    [InlineData("   ")]
+    public void Empty_body_gives_the_fallback(string? markdown) =>
+        HomeIntro.Parse(markdown).ShouldBe(HomeIntro.Fallback);
+
+    [Fact]
+    public void Body_without_heading_keeps_the_fallback_title_and_all_text()
+    {
+        var intro = HomeIntro.Parse("Nur ein Absatz.");
+
+        intro.Title.ShouldBe(HomeIntro.FallbackTitle);
+        intro.IntroHtml.ShouldContain("Nur ein Absatz.");
+        intro.Links.ShouldBeEmpty();
+    }
+
+    [Fact]
+    public void Last_paragraph_with_other_text_stays_intro()
+    {
+        // "oder" would get lost in a button row, so the paragraph stays text.
+        var intro = HomeIntro.Parse("# Hallo\n\n[Termine](/events) oder [Kontakt](/contact)");
+
+        intro.Links.ShouldBeEmpty();
+        intro.IntroHtml.ShouldContain("href=\"/events\"");
+    }
+
+    [Fact]
+    public void Link_paragraph_that_is_not_last_stays_intro()
+    {
+        var intro = HomeIntro.Parse("# Hallo\n\n[Termine](/events)\n\nSchlusssatz.");
+
+        intro.Links.ShouldBeEmpty();
+        intro.IntroHtml.ShouldContain("Schlusssatz.");
+    }
+
+    [Fact]
+    public void Heading_markup_is_reduced_to_its_text()
+    {
+        HomeIntro.Parse("# Willkommen beim **Elternbeirat**").Title.ShouldBe("Willkommen beim Elternbeirat");
+    }
+}