Add test to ensure title from sidebar is taken into account

scaladoc/test-documentations/sidebar/_docs/directory/index.md

@@ -0,0 +1,3 @@
+# Directory index
+
+This is the index file of the directory.

scaladoc/test-documentations/sidebar/_docs/index.md

@@ -0,0 +1,3 @@
+# Docs Home
+
+This is the index page.

scaladoc/test-documentations/sidebar/sidebar.yml

@@ -0,0 +1,5 @@
+index: index.md
+subsection:
+  - title: A Directory Subsection
+    index: directory/index.md
+    directory: directory

scaladoc/test/dotty/tools/scaladoc/site/SiteGeneratationTest.scala

@@ -124,3 +124,10 @@ class SiteGeneratationTest extends BaseHtmlTest:
         )
     }
   }
+
+  @Test
+  def sidebarFile() = withGeneratedSite(testDocPath.resolve("sidebar")) {
+    withHtmlFile("docs/index.html") { content =>
+      content.assertTextsIn("#leftColumn #docs-nav > div:nth-child(1) > span > a > span", "A Directory Subsection")
+    }
+  }