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expected no Exception, got #<NoMethodError: undefined method `symbol' for nil:NilClass> with backtrace:
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/http/parameters.rb:63:in `parse_formatted_parameters'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/http/request.rb:366:in `block in POST'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/rack-2.0.1/lib/rack/request.rb:57:in `fetch'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/rack-2.0.1/lib/rack/request.rb:57:in `fetch_header'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/http/request.rb:365:in `POST'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/http/parameters.rb:35:in `parameters'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/http/filter_parameters.rb:41:in `filtered_parameters'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_controller/metal/instrumentation.rb:21:in `process_action'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_controller/metal/params_wrapper.rb:248:in `process_action'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/abstract_controller/base.rb:126:in `process'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionview-5.0.0/lib/action_view/rendering.rb:30:in `process'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_controller/metal.rb:190:in `dispatch'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_controller/metal.rb:251:in `block in action'
          # ./lib/wash_out/router.rb:127:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/routing/mapper.rb:17:in `block in <class:Constraints>'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/routing/mapper.rb:46:in `serve'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/journey/router.rb:39:in `block in serve'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/journey/router.rb:26:in `each'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/journey/router.rb:26:in `serve'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/routing/route_set.rb:725:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/rack-2.0.1/lib/rack/etag.rb:25:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/rack-2.0.1/lib/rack/conditional_get.rb:38:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/rack-2.0.1/lib/rack/head.rb:12:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/rack-2.0.1/lib/rack/session/abstract/id.rb:222:in `context'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/rack-2.0.1/lib/rack/session/abstract/id.rb:216:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/middleware/cookies.rb:613:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/middleware/callbacks.rb:38:in `block in call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/activesupport-5.0.0/lib/active_support/callbacks.rb:97:in `__run_callbacks__'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/activesupport-5.0.0/lib/active_support/callbacks.rb:750:in `_run_call_callbacks'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/activesupport-5.0.0/lib/active_support/callbacks.rb:90:in `run_callbacks'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/middleware/callbacks.rb:36:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/middleware/remote_ip.rb:79:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/middleware/debug_exceptions.rb:49:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/railties-5.0.0/lib/rails/rack/logger.rb:36:in `call_app'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/railties-5.0.0/lib/rails/rack/logger.rb:24:in `block in call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/activesupport-5.0.0/lib/active_support/tagged_logging.rb:70:in `block in tagged'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/activesupport-5.0.0/lib/active_support/tagged_logging.rb:26:in `tagged'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/activesupport-5.0.0/lib/active_support/tagged_logging.rb:70:in `tagged'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/railties-5.0.0/lib/rails/rack/logger.rb:24:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/middleware/request_id.rb:24:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/rack-2.0.1/lib/rack/method_override.rb:22:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/rack-2.0.1/lib/rack/runtime.rb:22:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/activesupport-5.0.0/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/middleware/executor.rb:12:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/actionpack-5.0.0/lib/action_dispatch/middleware/static.rb:136:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/rack-2.0.1/lib/rack/sendfile.rb:111:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/railties-5.0.0/lib/rails/engine.rb:522:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/railties-5.0.0/lib/rails/railtie.rb:193:in `public_send'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/railties-5.0.0/lib/rails/railtie.rb:193:in `method_missing'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/rack-2.0.1/lib/rack/mock.rb:74:in `request'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/httpi-2.4.2/lib/httpi/adapter/rack.rb:92:in `request'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/httpi-2.4.2/lib/httpi.rb:161:in `request'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/httpi-2.4.2/lib/httpi.rb:133:in `post'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/savon-2.11.1/lib/savon/operation.rb:94:in `block in call_with_logging'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/savon-2.11.1/lib/savon/request_logger.rb:12:in `log'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/savon-2.11.1/lib/savon/operation.rb:94:in `call_with_logging'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/savon-2.11.1/lib/savon/operation.rb:54:in `call'
          # /home/raul/.rvm/gems/ruby-2.3.1@wash_out/gems/savon-2.11.1/lib/savon/client.rb:36:in `call'
          # ./spec/lib/wash_out_spec.rb:19:in `savon'
          # ./spec/lib/wash_out_spec.rb:775:in `block (4 levels) in <top (required)>'
          # ./spec/lib/wash_out_spec.rb:775:in `block (3 levels) in <top (required)>'
      # ./spec/lib/wash_out_spec.rb:775:in `block (3 levels) in <top (required)>'