Disable the prefix by default in testing helpers

A prefix is only necessary when it's not the standard "public" prefix,
which is rarely the case in testing helpers.

Closes #992

lib/oban.ex

@@ -49,7 +49,7 @@ defmodule Oban do
           | {:notifier, module() | {module(), Keyword.t()}}
           | {:peer, false | module() | {module(), Keyword.t()}}
           | {:plugins, false | [module() | {module() | Keyword.t()}]}
-          | {:prefix, String.t()}
+          | {:prefix, false | String.t()}
           | {:queues, false | [{queue_name(), pos_integer() | Keyword.t()}]}
           | {:repo, module()}
           | {:shutdown_grace_period, timeout()}

lib/oban/testing.ex

@@ -103,11 +103,7 @@ defmodule Oban.Testing do
 
   alias Oban.{Config, Job, Queue.Executor, Repo, Worker}
 
-  @type perform_opts ::
-          Job.option()
-          | {:log, Logger.level()}
-          | {:prefix, binary()}
-          | {:repo, module()}
+  @type perform_opts :: Job.option() | Oban.option()
 
   @conf_keys []
              |> Config.new()
@@ -120,7 +116,11 @@ defmodule Oban.Testing do
 
   @doc false
   defmacro __using__(repo_opts) do
-    _repo = Keyword.fetch!(repo_opts, :repo)
+    repo_opts = Keyword.put_new(repo_opts, :prefix, false)
+
+    unless Keyword.has_key?(repo_opts, :repo) do
+      raise ArgumentError, "testing requires a :repo option to be set"
+    end
 
     quote do
       alias Oban.Testing

test/oban/testing_test.exs

@@ -1,7 +1,7 @@
 defmodule Oban.TestingTest do
   use Oban.Case, async: true
 
-  use Oban.Testing, repo: Oban.Test.Repo, prefix: "public", log: false
+  use Oban.Testing, repo: Oban.Test.Repo, log: false
 
   alias Oban.{TelemetryHandler, Testing}