moving mrf settings from instance to separate group

test/config/deprecation_warnings_test.exs

@@ -0,0 +1,57 @@
+defmodule Pleroma.Config.DeprecationWarningsTest do
+  use ExUnit.Case, async: true
+  use Pleroma.Tests.Helpers
+
+  import ExUnit.CaptureLog
+
+  test "check_old_mrf_config/0" do
+    clear_config([:instance, :rewrite_policy], Pleroma.Web.ActivityPub.MRF.NoOpPolicy)
+    clear_config([:instance, :mrf_transparency], true)
+    clear_config([:instance, :mrf_transparency_exclusions], [])
+
+    assert capture_log(fn -> Pleroma.Config.DeprecationWarnings.check_old_mrf_config() end) =~
+             """
+             !!!DEPRECATION WARNING!!!
+             Your config is using old namespaces for MRF configuration. They should work for now, but you are advised to change to new namespaces to prevent possible issues later:
+
+             * `config :pleroma, :instance, rewrite_policy` is now `config :pleroma, :mrf, policies`
+             * `config :pleroma, :instance, mrf_transparency` is now `config :pleroma, :mrf, transparency`
+             * `config :pleroma, :instance, mrf_transparency_exclusions` is now `config :pleroma, :mrf, transparency_exclusions`
+             """
+  end
+
+  test "move_namespace_and_warn/2" do
+    old_group1 = [:group, :key]
+    old_group2 = [:group, :key2]
+    old_group3 = [:group, :key3]
+
+    new_group1 = [:another_group, :key4]
+    new_group2 = [:another_group, :key5]
+    new_group3 = [:another_group, :key6]
+
+    clear_config(old_group1, 1)
+    clear_config(old_group2, 2)
+    clear_config(old_group3, 3)
+
+    clear_config(new_group1)
+    clear_config(new_group2)
+    clear_config(new_group3)
+
+    config_map = [
+      {old_group1, new_group1, "\n error :key"},
+      {old_group2, new_group2, "\n error :key2"},
+      {old_group3, new_group3, "\n error :key3"}
+    ]
+
+    assert capture_log(fn ->
+             Pleroma.Config.DeprecationWarnings.move_namespace_and_warn(
+               config_map,
+               "Warning preface"
+             )
+           end) =~ "Warning preface\n error :key\n error :key2\n error :key3"
+
+    assert Pleroma.Config.get(new_group1) == 1
+    assert Pleroma.Config.get(new_group2) == 2
+    assert Pleroma.Config.get(new_group3) == 3
+  end
+end