Update the action to get the author's books including aliases.

test/decentralised_book_index/metadata/book_test.exs

@@ -72,5 +72,39 @@ defmodule DecentralisedBookIndex.Metadata.BookTest do
 
       assert {:ok, books} = Metadata.get_author_books(author)
     end
+
+    test "get the list contains aliases' books" do
+      {:ok, author} = Metadata.create_author("Author", "An description")
+      {:ok, alias1} =
+        Metadata.add_author_to_related_alias_registry("Author2", "An description2", author.id)
+      {:ok, alias2} =
+        Metadata.add_author_to_related_alias_registry("Author3", "An description3", author.id)
+
+      author_roles = [
+        %{order: 1, author_id: author.id, role: ""}
+      ]
+
+      {:ok, book} = Metadata.create_book("Book", "1234567890", "An description", author_roles)
+
+      author_roles = [
+        %{order: 1, author_id: alias1.id, role: ""}
+      ]
+
+      {:ok, book2} = Metadata.create_book("Book2", "1234567890", "An description", author_roles)
+
+      author_roles = [
+        %{order: 1, author_id: alias2.id, role: ""}
+      ]
+
+      {:ok, book3} = Metadata.create_book("Book3", "1234567890", "An description", author_roles)
+
+      assert {:ok, books} = Metadata.get_author_books(author)
+
+      book_ids = Enum.map(books, & &1.id)
+
+      assert book.id  in book_ids
+      assert book2.id in book_ids
+      assert book3.id in book_ids
+    end
   end
 end