test: correctly skip invalid tests

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

test/graphql/resolvers/admin_test.exs

@@ -347,6 +347,7 @@ defmodule Mobilizon.GraphQL.Resolvers.AdminTest do
 
     setup %{conn: conn} do
       Cachex.clear(:config)
+      on_exit(fn -> Cachex.clear(:config) end)
       [conn: conn]
     end
 

test/service/export/participants/csv_test.exs

@@ -7,7 +7,7 @@ defmodule Mobilizon.Service.Export.Participants.CSVTest do
   alias Mobilizon.Service.Export.Participants.CSV
 
   describe "export event participants to csv" do
-    @tag @skip
+    @tag :skip
     test "export basic infos" do
       %Event{} = event = insert(:event)
       insert(:participant, event: event, role: :creator)

test/tasks/maintenance/detect_spam_test.exs

@@ -8,6 +8,7 @@ defmodule Mix.Tasks.Mobilizon.Maintenance.DetectSpamTest do
   Mix.shell(Mix.Shell.Process)
 
   describe "detect spam" do
+    @tag :skip
     test "on all content" do
       insert(:actor, preferred_username: "ham")
       insert(:actor, preferred_username: "spam")

test/web/email/group_test.exs

@@ -14,7 +14,7 @@ defmodule Mobilizon.Web.Email.GroupTest do
   import Mobilizon.Factory
 
   describe "Notify of new event" do
-    @tag @skip
+    @tag :skip
     test "members, followers, execept the ones that disabled it" do
       {_user_creator, actor} = insert_user_with_settings("user@creator.com")
       %Actor{} = group = insert(:group)