diff --git a/spec/controllers/emojis_controller_spec.rb b/spec/controllers/emojis_controller_spec.rb
index 249dfd9d511..3fe19ee5ce3 100644
--- a/spec/controllers/emojis_controller_spec.rb
+++ b/spec/controllers/emojis_controller_spec.rb
@@ -8,13 +8,11 @@ describe EmojisController do
   let(:emoji) { Fabricate(:custom_emoji) }
 
   describe 'GET #show' do
-    subject(:body) { JSON.parse(response.body, symbolize_names: true) }
-
     let(:response) { get :show, params: { id: emoji.id, format: :json } }
 
     it 'returns the right response' do
       expect(response).to have_http_status 200
-      expect(body[:name]).to eq ':coolcat:'
+      expect(body_as_json[:name]).to eq ':coolcat:'
     end
   end
 end
diff --git a/spec/serializers/activitypub/device_serializer_spec.rb b/spec/serializers/activitypub/device_serializer_spec.rb
index 2a3be821214..23f0b24c4ea 100644
--- a/spec/serializers/activitypub/device_serializer_spec.rb
+++ b/spec/serializers/activitypub/device_serializer_spec.rb
@@ -3,13 +3,7 @@
 require 'rails_helper'
 
 describe ActivityPub::DeviceSerializer do
-  let(:serialization) do
-    JSON.parse(
-      ActiveModelSerializers::SerializableResource.new(
-        record, serializer: described_class
-      ).to_json
-    )
-  end
+  let(:serialization) { serialized_record_json(record, described_class) }
   let(:record) { Fabricate(:device) }
 
   describe 'type' do
diff --git a/spec/serializers/activitypub/note_serializer_spec.rb b/spec/serializers/activitypub/note_serializer_spec.rb
index 311a4573d95..338d66b308e 100644
--- a/spec/serializers/activitypub/note_serializer_spec.rb
+++ b/spec/serializers/activitypub/note_serializer_spec.rb
@@ -3,7 +3,7 @@
 require 'rails_helper'
 
 describe ActivityPub::NoteSerializer do
-  subject { JSON.parse(@serialization.to_json) }
+  subject { serialized_record_json(parent, described_class, adapter: ActivityPub::Adapter) }
 
   let!(:account) { Fabricate(:account) }
   let!(:other) { Fabricate(:account) }
@@ -14,10 +14,6 @@ describe ActivityPub::NoteSerializer do
   let!(:reply_by_account_third) { Fabricate(:status, account: account, thread: parent, visibility: :public) }
   let!(:reply_by_account_visibility_direct) { Fabricate(:status, account: account, thread: parent, visibility: :direct) }
 
-  before do
-    @serialization = ActiveModelSerializers::SerializableResource.new(parent, serializer: described_class, adapter: ActivityPub::Adapter)
-  end
-
   it 'has the expected shape' do
     expect(subject).to include({
       '@context' => include('https://www.w3.org/ns/activitystreams'),
diff --git a/spec/serializers/activitypub/one_time_key_serializer_spec.rb b/spec/serializers/activitypub/one_time_key_serializer_spec.rb
index 6fe1f06185e..89efe95c8c2 100644
--- a/spec/serializers/activitypub/one_time_key_serializer_spec.rb
+++ b/spec/serializers/activitypub/one_time_key_serializer_spec.rb
@@ -3,13 +3,7 @@
 require 'rails_helper'
 
 describe ActivityPub::OneTimeKeySerializer do
-  let(:serialization) do
-    JSON.parse(
-      ActiveModelSerializers::SerializableResource.new(
-        record, serializer: described_class
-      ).to_json
-    )
-  end
+  let(:serialization) { serialized_record_json(record, described_class) }
   let(:record) { Fabricate(:one_time_key) }
 
   describe 'type' do
diff --git a/spec/serializers/activitypub/undo_like_serializer_spec.rb b/spec/serializers/activitypub/undo_like_serializer_spec.rb
index 43cf7192e45..3d61e867519 100644
--- a/spec/serializers/activitypub/undo_like_serializer_spec.rb
+++ b/spec/serializers/activitypub/undo_like_serializer_spec.rb
@@ -3,13 +3,7 @@
 require 'rails_helper'
 
 describe ActivityPub::UndoLikeSerializer do
-  let(:serialization) do
-    JSON.parse(
-      ActiveModelSerializers::SerializableResource.new(
-        record, serializer: described_class
-      ).to_json
-    )
-  end
+  let(:serialization) { serialized_record_json(record, described_class) }
   let(:record) { Fabricate(:favourite) }
 
   describe 'type' do
diff --git a/spec/serializers/activitypub/update_poll_serializer_spec.rb b/spec/serializers/activitypub/update_poll_serializer_spec.rb
index 9a13fdd5768..8ff4fd27013 100644
--- a/spec/serializers/activitypub/update_poll_serializer_spec.rb
+++ b/spec/serializers/activitypub/update_poll_serializer_spec.rb
@@ -3,16 +3,12 @@
 require 'rails_helper'
 
 describe ActivityPub::UpdatePollSerializer do
-  subject { JSON.parse(@serialization.to_json) }
+  subject { serialized_record_json(status, described_class, adapter: ActivityPub::Adapter) }
 
   let(:account) { Fabricate(:account) }
   let(:poll)    { Fabricate(:poll, account: account) }
   let!(:status) { Fabricate(:status, account: account, poll: poll) }
 
-  before do
-    @serialization = ActiveModelSerializers::SerializableResource.new(status, serializer: described_class, adapter: ActivityPub::Adapter)
-  end
-
   it 'has a Update type' do
     expect(subject['type']).to eql('Update')
   end
diff --git a/spec/serializers/activitypub/vote_serializer_spec.rb b/spec/serializers/activitypub/vote_serializer_spec.rb
index c329542d791..b7c0b8928b8 100644
--- a/spec/serializers/activitypub/vote_serializer_spec.rb
+++ b/spec/serializers/activitypub/vote_serializer_spec.rb
@@ -3,13 +3,7 @@
 require 'rails_helper'
 
 describe ActivityPub::VoteSerializer do
-  let(:serialization) do
-    JSON.parse(
-      ActiveModelSerializers::SerializableResource.new(
-        record, serializer: described_class
-      ).to_json
-    )
-  end
+  let(:serialization) { serialized_record_json(record, described_class) }
   let(:record) { Fabricate(:poll_vote) }
 
   describe 'type' do
diff --git a/spec/serializers/rest/account_serializer_spec.rb b/spec/serializers/rest/account_serializer_spec.rb
index e399e88f37c..15939e484d8 100644
--- a/spec/serializers/rest/account_serializer_spec.rb
+++ b/spec/serializers/rest/account_serializer_spec.rb
@@ -3,7 +3,7 @@
 require 'rails_helper'
 
 describe REST::AccountSerializer do
-  subject { JSON.parse(ActiveModelSerializers::SerializableResource.new(account, serializer: described_class).to_json) }
+  subject { serialized_record_json(account, described_class) }
 
   let(:role)    { Fabricate(:user_role, name: 'Role', highlighted: true) }
   let(:user)    { Fabricate(:user, role: role) }
diff --git a/spec/serializers/rest/encrypted_message_serializer_spec.rb b/spec/serializers/rest/encrypted_message_serializer_spec.rb
index e0e70a3b846..01db1149af5 100644
--- a/spec/serializers/rest/encrypted_message_serializer_spec.rb
+++ b/spec/serializers/rest/encrypted_message_serializer_spec.rb
@@ -3,13 +3,7 @@
 require 'rails_helper'
 
 describe REST::EncryptedMessageSerializer do
-  let(:serialization) do
-    JSON.parse(
-      ActiveModelSerializers::SerializableResource.new(
-        record, serializer: described_class
-      ).to_json
-    )
-  end
+  let(:serialization) { serialized_record_json(record, described_class) }
   let(:record) { Fabricate(:encrypted_message) }
 
   describe 'account' do
diff --git a/spec/serializers/rest/instance_serializer_spec.rb b/spec/serializers/rest/instance_serializer_spec.rb
index 15a5de18dd0..8ac32f2247f 100644
--- a/spec/serializers/rest/instance_serializer_spec.rb
+++ b/spec/serializers/rest/instance_serializer_spec.rb
@@ -3,13 +3,7 @@
 require 'rails_helper'
 
 describe REST::InstanceSerializer do
-  let(:serialization) do
-    JSON.parse(
-      ActiveModelSerializers::SerializableResource.new(
-        record, serializer: described_class
-      ).to_json
-    )
-  end
+  let(:serialization) { serialized_record_json(record, described_class) }
   let(:record) { InstancePresenter.new }
 
   describe 'usage' do
diff --git a/spec/serializers/rest/keys/claim_result_serializer_spec.rb b/spec/serializers/rest/keys/claim_result_serializer_spec.rb
index cf9416f0328..7f7fb850cda 100644
--- a/spec/serializers/rest/keys/claim_result_serializer_spec.rb
+++ b/spec/serializers/rest/keys/claim_result_serializer_spec.rb
@@ -3,13 +3,7 @@
 require 'rails_helper'
 
 describe REST::Keys::ClaimResultSerializer do
-  let(:serialization) do
-    JSON.parse(
-      ActiveModelSerializers::SerializableResource.new(
-        record, serializer: described_class
-      ).to_json
-    )
-  end
+  let(:serialization) { serialized_record_json(record, described_class) }
   let(:record) { Keys::ClaimService::Result.new(Account.new(id: 123), 456) }
 
   describe 'account' do
diff --git a/spec/serializers/rest/keys/device_serializer_spec.rb b/spec/serializers/rest/keys/device_serializer_spec.rb
index c15e197cb8f..28177a3db5a 100644
--- a/spec/serializers/rest/keys/device_serializer_spec.rb
+++ b/spec/serializers/rest/keys/device_serializer_spec.rb
@@ -3,13 +3,7 @@
 require 'rails_helper'
 
 describe REST::Keys::DeviceSerializer do
-  let(:serialization) do
-    JSON.parse(
-      ActiveModelSerializers::SerializableResource.new(
-        record, serializer: described_class
-      ).to_json
-    )
-  end
+  let(:serialization) { serialized_record_json(record, described_class) }
   let(:record) { Device.new(name: 'Device name') }
 
   describe 'name' do
diff --git a/spec/serializers/rest/keys/query_result_serializer_spec.rb b/spec/serializers/rest/keys/query_result_serializer_spec.rb
index 983780ae98f..ef67d706750 100644
--- a/spec/serializers/rest/keys/query_result_serializer_spec.rb
+++ b/spec/serializers/rest/keys/query_result_serializer_spec.rb
@@ -3,13 +3,7 @@
 require 'rails_helper'
 
 describe REST::Keys::QueryResultSerializer do
-  let(:serialization) do
-    JSON.parse(
-      ActiveModelSerializers::SerializableResource.new(
-        record, serializer: described_class
-      ).to_json
-    )
-  end
+  let(:serialization) { serialized_record_json(record, described_class) }
   let(:record) { Keys::QueryService::Result.new(Account.new(id: 123), []) }
 
   describe 'account' do
diff --git a/spec/serializers/rest/suggestion_serializer_spec.rb b/spec/serializers/rest/suggestion_serializer_spec.rb
index b3c086208db..60420d80234 100644
--- a/spec/serializers/rest/suggestion_serializer_spec.rb
+++ b/spec/serializers/rest/suggestion_serializer_spec.rb
@@ -3,13 +3,7 @@
 require 'rails_helper'
 
 describe REST::SuggestionSerializer do
-  let(:serialization) do
-    JSON.parse(
-      ActiveModelSerializers::SerializableResource.new(
-        record, serializer: described_class
-      ).to_json
-    )
-  end
+  let(:serialization) { serialized_record_json(record, described_class) }
   let(:record) do
     AccountSuggestions::Suggestion.new(
       account: account,
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 4c4e31dd2a5..39c4abe5c9c 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -52,6 +52,17 @@ def json_str_to_hash(str)
   JSON.parse(str, symbolize_names: true)
 end
 
+def serialized_record_json(record, serializer, adapter: nil)
+  options = { serializer: serializer }
+  options[:adapter] = adapter if adapter.present?
+  JSON.parse(
+    ActiveModelSerializers::SerializableResource.new(
+      record,
+      options
+    ).to_json
+  )
+end
+
 def expect_push_bulk_to_match(klass, matcher)
   allow(Sidekiq::Client).to receive(:push_bulk)
   yield