Update the generators to generate bids.

test/support/generators.ex

@@ -63,4 +63,31 @@ defmodule DecentralisedBookIndex.Generators do
       %{order: order, author_id: generate(author(actor: actor)).id, role: ""}
     end
   end
+
+  @doc """
+  Generates a list of bids.
+
+  Example:
+  > bids = bids()
+  """
+  def bids(opts \\ []) do
+    actor =
+      opts[:actor] ||
+        once(:default_actor, fn ->
+          generate(user())
+        end)
+
+    count =
+      opts[:count] || 2
+
+    types = ["isbn10", "isbn13", "asin"]
+
+    if count > length(types), do: count = length(types)
+
+    random_types = Enum.take_random(types, count)
+
+    for {order, type} <- Enum.zip(1..count, random_types) do
+      %{order: order, type: type, bid: "1234567890"}
+    end
+  end
 end