Merge branch 'fix/credo-issues-test' into 'develop'

Fix credo issues in ./test

See merge request pleroma/pleroma!808

diff --cc test/object_test.exs
Simple merge

diff --cc test/user_test.exs
Simple merge

diff --cc test/web/activity_pub/activity_pub_controller_test.exs
Simple merge

diff --cc test/web/mastodon_api/mastodon_api_controller_test.exs
Simple merge