Adding curator and thumbnail in learning_objects tests

spec/acceptance/learning_objects_spec.rb

@@ -54,9 +54,13 @@ resource 'Learning Objects' do
     parameter :object_type_id, 'The id of object type', scope: :learning_object
     parameter :language_id, 'The id of a language', scope: :learning_object
     parameter :license_id, 'The id of a license', scope: :learning_object
+    parameter :curator, 'The name of curator', scope: :learning_object
+    parameter :thumbnail, 'The learning_object thumbnail', scope: :learning_object
 
     let(:author) { Faker::Name.name }
     let(:name) { Faker::Name.name }
+    let(:curator) { Faker::Name.name }
+    let(:thumbnail) { Faker::Avatar.image }
     let(:description) { Faker::Lorem.paragraph }
     let(:object_type_id) { object_types.first.id }
     let(:language_id) { languages.first.id }