diff --git a/test/decentralised_book_index/metadata/book_test.exs b/test/decentralised_book_index/metadata/book_test.exs
index 7f99ed2..7960f94 100644
--- a/test/decentralised_book_index/metadata/book_test.exs
+++ b/test/decentralised_book_index/metadata/book_test.exs
@@ -5,43 +5,79 @@ defmodule DecentralisedBookIndex.Metadata.BookTest do
 
   describe "books and registries relationship" do
     test "a new book get new registry by default" do
-      assert {:ok, book} = Metadata.create_book("Book", "1234567890", "An description")
+      {:ok, author} = Metadata.create_author("Author", "An description")
+
+      author_roles = [
+        %{order: 1, author_id: author.id, role: ""}
+      ]
+
+      assert {:ok, book} = Metadata.create_book("Book", "1234567890", "An description", author_roles)
       assert book.book_editions_registry_id != nil
     end
 
     test "a new book belongs to a registry if specified" do
+      {:ok, author} = Metadata.create_author("Author", "An description")
+
+      author_roles = [
+        %{order: 1, author_id: author.id, role: ""}
+      ]
+
       assert {:ok, registry} = Metadata.create_book_editions_registry()
-      assert {:ok, book} = Metadata.create_book("Book", "1234567890", "An description", registry.id)
+      assert {:ok, book} = Metadata.create_book("Book", "1234567890", "An description", author_roles, registry.id)
       assert book.book_editions_registry_id == registry.id
     end
 
     test "a new book to a registry via a related book record" do
-      {:ok, related_book} = Metadata.create_book("Book", "1234567890", "An description")
+      {:ok, author} = Metadata.create_author("Author", "An description")
+
+      author_roles = [
+        %{order: 1, author_id: author.id, role: ""}
+      ]
+
+      {:ok, related_book} = Metadata.create_book("Book", "1234567890", "An description", author_roles)
 
       assert {:ok, book} =
-        Metadata.add_book_to_related_editions_registry("Book2", "1234567891", "An description2", related_book.id)
+        Metadata.add_book_to_related_editions_registry("Book2", "1234567891", "An description2", author_roles, related_book.id)
 
       assert related_book.book_editions_registry_id == book.book_editions_registry_id
     end
 
     test "a new book to a registry via a empty related book record" do
+      {:ok, author} = Metadata.create_author("Author", "An description")
+
+      author_roles = [
+        %{order: 1, author_id: author.id, role: ""}
+      ]
+
       assert {:error, _} =
-        Metadata.add_book_to_related_editions_registry("Book2", "1234567891", "An description2", nil)
+        Metadata.add_book_to_related_editions_registry("Book2", "1234567891", "An description2", author_roles, nil)
     end
   end
 
   describe "books alternatives names" do
     test "new book has no alternatives names" do
-      {:ok, book} = Metadata.create_book("Book", "1234567890", "An description")
+      {:ok, author} = Metadata.create_author("Author", "An description")
+
+      author_roles = [
+        %{order: 1, author_id: author.id, role: ""}
+      ]
+
+      {:ok, book} = Metadata.create_book("Book", "1234567890", "An description", author_roles)
       assert {:ok, alternatives_names} = Metadata.get_book_alternative_editions(book)
       assert alternatives_names = []
     end
 
     test "book has related book so they has one alternative name" do
-      {:ok, related_book} = Metadata.create_book("Book", "1234567890", "An description")
+      {:ok, author} = Metadata.create_author("Author", "An description")
+
+      author_roles = [
+        %{order: 1, author_id: author.id, role: ""}
+      ]
+
+      {:ok, related_book} = Metadata.create_book("Book", "1234567890", "An description", author_roles)
 
       {:ok, book} =
-        Metadata.add_book_to_related_editions_registry("Book2", "1234567891", "An description2", related_book.id)
+        Metadata.add_book_to_related_editions_registry("Book2", "1234567891", "An description2", author_roles, related_book.id)
 
       assert {:ok, alternatives_names} = Metadata.get_book_alternative_editions(book)
       assert alternatives_names = [related_book]