Fix test for non-empty sub directory

Fixes: #2650

modules/addonlib/src/test/scala/docspell/addons/AddonArchiveTest.scala

@@ -9,7 +9,7 @@ package docspell.addons
 import cats.effect._
 import cats.syntax.option._
 
-import docspell.common.UrlReader
+import docspell.common._
 import docspell.logging.TestLoggingConfig
 
 import munit._
@@ -42,10 +42,20 @@ class AddonArchiveTest extends CatsEffectSuite with TestLoggingConfig with Fixtu
     } yield ()
   }
 
+  tempDir.test("read archive from zip with yaml only") { dir =>
+    for {
+      aa <- AddonArchive.read[IO](singleFileAddonUrl, UrlReader.defaultReader[IO], None)
+      _ = assertEquals(aa.version, "0.7.0")
+      path <- aa.extractTo(UrlReader.defaultReader[IO], dir)
+      read <- AddonArchive.read[IO](aa.url, UrlReader.defaultReader[IO], path.some)
+      _ = assertEquals(aa, read)
+    } yield ()
+  }
+
   tempDir.test("Read generated addon from path") { dir =>
     AddonGenerator.successAddon("mini-addon").use { addon =>
       for {
-        archive <- IO(AddonArchive(addon.url, "", ""))
+        archive <- IO(AddonArchive(addon.url, "test-addon", "0.1.0"))
         path <- archive.extractTo[IO](UrlReader.defaultReader[IO], dir)
 
         read <- AddonArchive.read[IO](addon.url, UrlReader.defaultReader[IO], path.some)

modules/addonlib/src/test/scala/docspell/addons/Fixtures.scala

@@ -31,6 +31,9 @@ trait Fixtures extends TestLoggingConfig { self: CatsEffectSuite =>
   val miniAddonUrl =
     LenientUri.fromJava(getClass.getResource("/minimal-addon.zip"))
 
+  val singleFileAddonUrl =
+    LenientUri.fromJava(getClass.getResource("/docspell-addon-single-file.zip"))
+
   val dummyAddonMeta =
     AddonMeta(
       meta =