Actually use the attributes in the request

lib/rspec_api_documentation/dsl/endpoint/params.rb

@@ -13,11 +13,19 @@ def initialize(example_group, example, extra_params)
         end
 
         def call
-          parameters = example.metadata.fetch(:parameters, {}).inject({}) do |hash, param|
+          set_param = -> hash, param {
             SetParam.new(self, hash, param).call
-          end
-          parameters.deep_merge!(extra_params)
-          parameters
+          }
+
+          example.metadata
+            .fetch(:parameters, {})
+            .inject({}, &set_param)
+            .deep_merge(
+              example.metadata
+                .fetch(:attributes, {})
+                .inject({}, &set_param)
+            )
+            .deep_merge(extra_params)
         end
 
       private

spec/dsl_spec.rb

@@ -130,9 +130,12 @@
     parameter :id, 'The ID of the resource.', :required => true, scope: :data
     parameter :note, "Any additional notes about your order."
 
+    attribute :tip, "The amount you want to tip", :required => true
+
     let(:type) { "coffee" }
     let(:size) { "medium" }
     let(:data_id) { 2 }
+    let(:tip) { 20 }
 
     let(:id) { 1 }
 
@@ -157,6 +160,10 @@
         expect(params['data']).to eq({'id' => 2})
       end
 
+      it "should set attributes as well" do
+        expect(params["tip"]).to eq(tip())
+      end
+
       it "should allow extra parameters to be passed in" do
         expect(client).to receive(method).with(path, params.merge("extra" => true), nil)
         do_request(:extra => true)