Add error check if Exchange config gives empty folder list (fixes #1802)

app/controllers/integration/exchange_controller.rb

@@ -25,9 +25,10 @@ class Integration::ExchangeController < ApplicationController
   def folders
     answer_with do
       Sequencer.process('Import::Exchange::AvailableFolders',
-                        parameters: {
-                          ews_config: ews_config
-                        })
+                        parameters: { ews_config: ews_config })
+               .tap do |res|
+                 raise 'No folders found for given user credentials.' if res[:folders].blank?
+               end
     end
   end
 
@@ -35,13 +36,11 @@ class Integration::ExchangeController < ApplicationController
     answer_with do
       raise 'Please select at least one folder.' if params[:folders].blank?
 
-      examples = Sequencer.process('Import::Exchange::AttributesExamples',
-                                   parameters: {
-                                     ews_folder_ids: params[:folders],
-                                     ews_config:     ews_config
-                                   })
-      examples.tap do |result|
-        raise 'No entries found in selected folder(s).' if result[:attributes].blank?
+      Sequencer.process('Import::Exchange::AttributesExamples',
+                        parameters: { ews_folder_ids: params[:folders],
+                                      ews_config:     ews_config })
+               .tap do |res|
+                 raise 'No entries found in selected folder(s).' if res[:attributes].blank?
                end
     end
   end

spec/requests/integration/exchange_spec.rb

@@ -0,0 +1,28 @@
+require 'rails_helper'
+
+RSpec.describe 'Exchange integration endpoint', type: :request do
+  before { authenticated_as(admin_with_admin_user_permissions) }
+
+  let(:admin_with_admin_user_permissions) do
+    create(:user, roles: [role_with_admin_user_permissions])
+  end
+
+  let(:role_with_admin_user_permissions) do
+    create(:role).tap { |role| role.permission_grant('admin.integration') }
+  end
+
+  describe 'EWS folder retrieval' do
+    context 'when no folders found' do
+      let(:empty_folder_list) { { folders: {} } }
+
+      it 'responds with an error message' do
+        allow(Sequencer).to receive(:process).with(any_args).and_return(empty_folder_list)
+
+        post api_v1_integration_exchange_folders_path,
+             params: {}, as: :json
+
+        expect(json_response).to include('result' => 'failed').and include('message')
+      end
+    end
+  end
+end

spec/support/request.rb

@@ -8,8 +8,9 @@ module ZammadSpecSupportRequest
   %i[get post patch put delete head].each do |method_id|
 
     define_method(method_id) do |path, **args|
-      headers = Hash(headers).merge(Hash(@headers))
-      super(path, headers: headers, **args)
+      args = args.with_indifferent_access
+      args[:headers] = Hash(args[:headers]).merge!(Hash(@headers))
+      super(path, **args.symbolize_keys)
     end
   end