Add generators for Publisher and Book for testing.

test/support/generators.ex

@@ -90,4 +90,69 @@ defmodule DecentralisedBookIndex.Generators do
       %{order: order, type: type, bid: "1234567890"}
     end
   end
+
+  @doc """
+  Generates a publisher.
+  """
+  def publisher(opts \\ []) do
+    actor =
+      opts[:actor] ||
+        once(:default_actor, fn ->
+          generate(user())
+        end)
+
+    changeset_generator(
+      Metadata.Publisher,
+      :create,
+      defaults: [
+        name: sequence(:name, &"Publisher #{&1}"),
+      ],
+      overrides: opts,
+      actor: actor
+    )
+  end
+
+  @doc """
+  Generates a book.
+  """
+  def book(opts \\ []) do
+    actor =
+      opts[:actor] ||
+        once(:default_actor, fn ->
+          generate(user())
+        end)
+
+    bids =
+      opts[:bids] ||
+        once(:default_bids, fn ->
+          bids()
+        end)
+
+    author_roles =
+      opts[:author_roles] ||
+        once(:default_author_roles, fn ->
+          author_roles()
+        end)
+
+    publisher =
+      opts[:publisher] ||
+        once(:default_publisher, fn ->
+          generate(publisher())
+        end)
+
+    changeset_generator(
+      Metadata.Book,
+      :create,
+      defaults: [
+        title: sequence(:name, &"Book #{&1}"),
+        description: sequence(:name, &"Description #{&1}"),
+        bids: bids,
+        author_roles: author_roles,
+        publisher: publisher,
+        book_editions_registry_id: nil,
+      ],
+      overrides: opts,
+      actor: actor
+    )
+  end
 end