[ART] POA request resolution validates unique POA request

Author: nihil2501

modules/accredited_representative_portal/app/models/accredited_representative_portal/power_of_attorney_request_resolution.rb

@@ -32,5 +32,7 @@ module Resolving
     has_kms_key
 
     has_encrypted :reason, key: :kms_key, **lockbox_options
+
+    validates :power_of_attorney_request, uniqueness: true
   end
 end

modules/accredited_representative_portal/spec/models/accredited_representative_portal/power_of_attorney_request_resolution_spec.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe AccreditedRepresentativePortal::PowerOfAttorneyRequestResolution, type: :model do
+  it 'must uniquely be associated to a poa request' do
+    resolution_a = create(:power_of_attorney_request_resolution, :expiration)
+
+    resolution_b = build(
+      :power_of_attorney_request_resolution, :expiration,
+      power_of_attorney_request: resolution_a.power_of_attorney_request
+    )
+
+    expect(resolution_b).not_to be_valid
+    expect(resolution_b.errors.full_messages).to eq(
+      [
+       "Power of attorney request has already been taken",
+       "Resolving is invalid"
+      ]
+    )
+  end
+end