Add some response values to paginated endpoints to know the total amount of records, etc.

class PaginationMetadataTest < ActionDispatch::IntegrationTest
    disable_transactional_fixtures!

    def setup
      @provider= FactoryBot.create(:provider_account)
      host! provider.admin_domain
      FactoryBot.create_list(:simple_service, 600, account: provider)
    end

    attr_reader :provider

    test 'json' do
      perform_request(format: :json)
      pp response.body
    end

    test 'xml' do
      perform_request(format: :xml)
      pp response.body
    end

    private

    def parsed_response
      JSON.parse(response.body)
    rescue JSON::ParserError => e
      pp e.class
      return Hash.from_xml(response.body)
    end

    def perform_request(format:)
      access_token_value = FactoryBot.create(:access_token, owner: provider.admin_user, scopes: %w[account_management], permission: 'ro').value
      get admin_api_services_path(access_token: access_token_value, format: format, per_page: 2, page: 2)
      assert_response :success
    end
end

{
  "services":[
    {
      "service":{
        "id":4,
        "name":"simpleservice7",
        "state":"incomplete",
        "system_name":"simpleservice7",
        "backend_version":1,
        "deployment_option":"hosted",
        "support_email":"foo33@example.net",
        "intentions_required":false,
        "buyers_manage_apps":true,
        "buyers_manage_keys":true,
        "referrer_filters_required":false,
        "custom_keys_enabled":true,
        "buyer_key_regenerate_enabled":true,
        "mandatory_app_key":false,
        "buyer_can_select_plan":false,
        "buyer_plan_change_permission":"request",
        "created_at":"2020-11-25T13:40:25Z",
        "updated_at":"2020-11-25T13:40:25Z",
        "links":[
          {
            "rel":"metrics",
            "href":"http://admin-domain-company14.com/admin/api/services/4/metrics"
          },
          {
            "rel":"self",
            "href":"http://admin-domain-company14.com/admin/api/services/4"
          },
          {
            "rel":"service_plans",
            "href":"http://admin-domain-company14.com/admin/api/services/4/service_plans"
          },
          {
            "rel":"application_plans",
            "href":"http://admin-domain-company14.com/admin/api/services/4/application_plans"
          },
          {
            "rel":"features",
            "href":"http://admin-domain-company14.com/admin/api/services/4/features"
          }
        ]
      }
    },
    {
      "service":{
        "id":5,
        "name":"simpleservice8",
        "state":"incomplete",
        "system_name":"simpleservice8",
        "backend_version":1,
        "deployment_option":"hosted",
        "support_email":"foo33@example.net",
        "intentions_required":false,
        "buyers_manage_apps":true,
        "buyers_manage_keys":true,
        "referrer_filters_required":false,
        "custom_keys_enabled":true,
        "buyer_key_regenerate_enabled":true,
        "mandatory_app_key":false,
        "buyer_can_select_plan":false,
        "buyer_plan_change_permission":"request",
        "created_at":"2020-11-25T13:40:25Z",
        "updated_at":"2020-11-25T13:40:25Z",
        "links":[
          {
            "rel":"metrics",
            "href":"http://admin-domain-company14.com/admin/api/services/5/metrics"
          },
          {
            "rel":"self",
            "href":"http://admin-domain-company14.com/admin/api/services/5"
          },
          {
            "rel":"service_plans",
            "href":"http://admin-domain-company14.com/admin/api/services/5/service_plans"
          },
          {
            "rel":"application_plans",
            "href":"http://admin-domain-company14.com/admin/api/services/5/application_plans"
          },
          {
            "rel":"features",
            "href":"http://admin-domain-company14.com/admin/api/services/5/features"
          }
        ]
      }
    }
  ]
}

<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<services per_page="\"2\"" total_entries="\"601\"" total_pages="\"301\"" current_page="\"2\"">
  <service>
    <id>4</id>
    <account_id>2</account_id>
    <name>simpleservice607</name>
    <state>incomplete</state>
    <system_name>simpleservice607</system_name>
    <backend_version>1</backend_version><description/>
    <intentions_required>false</intentions_required>
    <buyers_manage_apps>true</buyers_manage_apps>
    <buyers_manage_keys>true</buyers_manage_keys>
    <referrer_filters_required>false</referrer_filters_required>
    <custom_keys_enabled>true</custom_keys_enabled>
    <buyer_key_regenerate_enabled>true</buyer_key_regenerate_enabled>
    <mandatory_app_key>false</mandatory_app_key>
    <buyer_can_select_plan>false</buyer_can_select_plan>
    <buyer_plan_change_permission>request</buyer_plan_change_permission>
    <deployment_option>hosted</deployment_option>
    <support_email>foo35@example.net</support_email>
    <metrics>
      <metric>
        <id>5</id>
        <name>hits</name>
        <system_name>hits</system_name>
        <friendly_name>Hits</friendly_name>
        <service_id>4</service_id>
        <description>Number of API hits</description>
        <unit>hit</unit>
      </metric>
    </metrics>
  </service>
  <service>
    <id>5</id>
    <account_id>2</account_id>
    <name>simpleservice608</name>
    <state>incomplete</state>
    <system_name>simpleservice608</system_name>
    <backend_version>1</backend_version><description/>
    <intentions_required>false</intentions_required>
    <buyers_manage_apps>true</buyers_manage_apps>
    <buyers_manage_keys>true</buyers_manage_keys>
    <referrer_filters_required>false</referrer_filters_required>
    <custom_keys_enabled>true</custom_keys_enabled>
    <buyer_key_regenerate_enabled>true</buyer_key_regenerate_enabled>
    <mandatory_app_key>false</mandatory_app_key>
    <buyer_can_select_plan>false</buyer_can_select_plan>
    <buyer_plan_change_permission>request</buyer_plan_change_permission>
    <deployment_option>hosted</deployment_option>
    <support_email>foo35@example.net</support_email>
    <metrics>
      <metric>
        <id>6</id>
        <name>hits</name>
        <system_name>hits</system_name>
        <friendly_name>Hits</friendly_name>
        <service_id>5</service_id>
        <description>Number of API hits</description>
        <unit>hit</unit>
      </metric>
    </metrics>
  </service>
</services>