Serializers spec coverage (#24017)

spec/serializers/rest/encrypted_message_serializer_spec.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe REST::EncryptedMessageSerializer do
+  let(:serialization) do
+    JSON.parse(
+      ActiveModelSerializers::SerializableResource.new(
+        record, serializer: described_class
+      ).to_json
+    )
+  end
+  let(:record) { Fabricate(:encrypted_message) }
+
+  describe 'account' do
+    it 'returns the associated account' do
+      expect(serialization['account_id']).to eq(record.from_account.id.to_s)
+    end
+  end
+end