Add AuthorSync to sync author's attributes.

test/decentralised_book_index/sync/sync/author_sync_test.exs

@@ -0,0 +1,43 @@
+defmodule DecentralisedBookIndex.Sync.DataTransformers.AuthorSyncTest do
+  use DecentralisedBookIndex.DataCase, async: true
+
+  alias DecentralisedBookIndex.Sync.AuthorSync
+  alias DecentralisedBookIndex.Metadata.Author
+  alias DecentralisedBookIndex.Metadata
+
+  describe "sync author transformations" do
+    test "a new author will be created" do
+      author = %{
+        id: "889a323e-d104-4b5d-b276-dad5a9b1da9d",
+        name: "Author",
+        description: "Something",
+        author_alias_registry_id: nil
+      }
+
+      assert :ok = AuthorSync.create_update(author)
+      assert {:ok, saved_author} = Metadata.get_author_by_id(author.id)
+
+      assert author.id == saved_author.id
+      assert author.name == saved_author.name
+      assert nil != saved_author.author_alias_registry_id
+    end
+
+    test "update an existing author" do
+      {:ok, author} = Metadata.create_author("Author", "An description")
+
+      author_attrs = %{
+        id: author.id,
+        name: "Author2",
+        description: "Something2",
+        author_alias_registry_id: nil
+      }
+
+      assert :ok = AuthorSync.create_update(author_attrs)
+      assert {:ok, saved_author} = Metadata.get_author_by_id(author.id)
+
+      assert author.id == saved_author.id
+      assert author_attrs.name == saved_author.name
+      assert author_attrs.description == saved_author.description
+    end
+  end
+end