Remove deprecated "use Plug.Test"

test/pleroma/web/plugs/cache_test.exs

@@ -5,7 +5,8 @@
 defmodule Pleroma.Web.Plugs.CacheTest do
   # Relies on Cachex, has to stay synchronous
   use Pleroma.DataCase
-  use Plug.Test
+  import Plug.Conn
+  import Plug.Test
 
   alias Pleroma.Web.Plugs.Cache
 

test/pleroma/web/plugs/digest_plug_test.exs

@@ -4,7 +4,8 @@
 
 defmodule Pleroma.Web.Plugs.DigestPlugTest do
   use ExUnit.Case, async: true
-  use Plug.Test
+  import Plug.Conn
+  import Plug.Test
 
   test "digest algorithm is taken from digest header" do
     body = "{\"hello\": \"world\"}"

test/pleroma/web/plugs/idempotency_plug_test.exs

@@ -5,7 +5,8 @@
 defmodule Pleroma.Web.Plugs.IdempotencyPlugTest do
   # Relies on Cachex, has to stay synchronous
   use Pleroma.DataCase
-  use Plug.Test
+  import Plug.Conn
+  import Plug.Test
 
   alias Pleroma.Web.Plugs.IdempotencyPlug
   alias Plug.Conn

test/pleroma/web/plugs/remote_ip_test.exs

@@ -4,7 +4,8 @@
 
 defmodule Pleroma.Web.Plugs.RemoteIpTest do
   use ExUnit.Case
-  use Plug.Test
+  import Plug.Conn
+  import Plug.Test
 
   alias Pleroma.Web.Plugs.RemoteIp
 

test/pleroma/web/plugs/set_format_plug_test.exs

@@ -4,7 +4,8 @@
 
 defmodule Pleroma.Web.Plugs.SetFormatPlugTest do
   use ExUnit.Case, async: true
-  use Plug.Test
+  import Plug.Conn
+  import Plug.Test
 
   alias Pleroma.Web.Plugs.SetFormatPlug
 

test/pleroma/web/plugs/set_locale_plug_test.exs

@@ -4,7 +4,7 @@
 
 defmodule Pleroma.Web.Plugs.SetLocalePlugTest do
   use ExUnit.Case, async: true
-  use Plug.Test
+  import Plug.Test
 
   alias Pleroma.Web.Plugs.SetLocalePlug
   alias Plug.Conn