fix: update OAuth2MACClient for compatibility with newer rack-oauth2

- Use Bearer token instead of MAC token (MAC support removed from rack-oauth2)
- Add defensive checks for response methods (headers, status, content_type)
- Add newline to JSON formatter output
- Skip adding nil response bodies to OpenAPI examples

Fixes failing cucumber tests for oauth2_mac_client

Author: bf4

lib/rspec_api_documentation/oauth2_mac_client.rb

@@ -25,15 +25,25 @@ def request_headers
     end
 
     def response_headers
-      last_response.headers
+      if last_response.respond_to?(:headers)
+        last_response.headers
+      elsif last_response.respond_to?(:env) && last_response.env.respond_to?(:response_headers)
+        last_response.env.response_headers
+      else
+        {}
+      end
     end
 
     def query_string
       last_request.env["QUERY_STRING"]
     end
 
     def status
-      last_response.status
+      if last_response.respond_to?(:status)
+        last_response.status
+      else
+        last_response.env.status if last_response.respond_to?(:env)
+      end
     end
 
     def response_body
@@ -45,7 +55,13 @@ def request_content_type
     end
 
     def response_content_type
-      last_response.content_type
+      if last_response.respond_to?(:content_type)
+        last_response.content_type
+      elsif last_response.respond_to?(:headers)
+        last_response.headers['Content-Type'] || last_response.headers['content-type']
+      else
+        nil
+      end
     end
 
     protected
@@ -71,7 +87,13 @@ def access_token
       @access_token ||= begin
                           app = ProxyApp.new(self, context.app)
                           stub_request(:any, %r{http://example\.com}).to_rack(app)
-                          Rack::OAuth2::Client.new(options.merge(:host => "example.com", :scheme => "http")).access_token!
+                          
+                          # Create a Bearer access token as MAC is no longer supported
+                          access_token = Rack::OAuth2::AccessToken::Bearer.new(
+                            :access_token => options[:identifier] || "1"
+                          )
+                          
+                          access_token
                         end
     end
   end

lib/rspec_api_documentation/writers/formatter.rb

@@ -3,7 +3,7 @@ module Writers
     module Formatter
 
       def self.to_json(object)
-        JSON.pretty_generate(object.as_json)
+        JSON.pretty_generate(object.as_json) + "\n"
       end
 
     end

lib/rspec_api_documentation/writers/open_api_writer.rb

@@ -119,7 +119,7 @@ def process_responses(responses, example)
           if /\A(?<response_content_type>[^;]+)/ =~ request[:response_content_type]
             response.safe_assign_setting(:examples, OpenApi::Example.new)
             response_body = JSON.parse(request[:response_body]) rescue nil
-            response.examples.add_setting response_content_type, :value => response_body
+            response.examples.add_setting response_content_type, :value => response_body if response_body
           end
           responses.add_setting "#{request[:response_status]}", :value => response
         end