Consolidate JSON parsing in serializers specs (#27693)

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) }

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

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

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

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

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

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,