Add/Fix tests

Author: hoffmaen

app/messages/route_create_message.rb

@@ -95,7 +95,7 @@ class RouteOptions < BaseMessage
       register_allowed_keys %i[lb_algo]
       validates_with NoAdditionalKeysValidator
       validates :lb_algo,
-                inclusion: { in: %w[least-connections round-robin], message: 'must be \'least-connections\' or \'round-robin\'' },
+                inclusion: { in: %w[least-connections round-robin], message: "'%<value>s' is not a supported load-balancing algorithm" },
                 presence: true,
                 allow_nil: true
     end

app/models/runtime/route.rb

@@ -85,7 +85,7 @@ def options_with_serialization=(opts)
 
 def options_with_serialization
   string = options_without_serialization
-  return {} if string.blank?
+  return nil if string.blank?
 
   Oj.load(string)
 end

spec/unit/presenters/v3/route_presenter_spec.rb

@@ -5,6 +5,7 @@ module VCAP::CloudController::Presenters::V3
   RSpec.describe RoutePresenter do
     let!(:app) { VCAP::CloudController::AppModel.make }
     let(:space) { VCAP::CloudController::Space.make }
+    let(:options) { { lb_algo: 'round-robin' } }
     let(:org) { space.organization }
     let(:route_host) { 'host' }
     let(:path) { '/path' }
@@ -20,7 +21,8 @@ module VCAP::CloudController::Presenters::V3
           host: route_host,
           path: path,
           space: space,
-          domain: domain
+          domain: domain,
+          options: options
         )
       end
 
@@ -70,6 +72,7 @@ module VCAP::CloudController::Presenters::V3
         expect(subject[:updated_at]).to be_a(Time)
         expect(subject[:host]).to eq(route_host)
         expect(subject[:path]).to eq(path)
+        expect(subject[:options]).to eq('lb_algo' => 'round-robin')
         expect(subject[:url]).to eq("#{route.host}.#{domain.name}#{route.path}")
 
         expected_destinations = [
@@ -125,6 +128,21 @@ module VCAP::CloudController::Presenters::V3
         end
       end
 
+      context 'when options is empty' do
+        let(:route) do
+          VCAP::CloudController::Route.make(
+            host: 'foobar',
+            path: path,
+            space: space,
+            domain: domain,
+          )
+        end
+
+        it 'does not output options' do
+          expect(subject[:options]).to be_nil
+        end
+      end
+
       context 'when there are decorators' do
         let(:banana_decorator) do
           Class.new do