Response body value validation

Add the possibility to pass a block to the run_test!
method in order to add expectations on your response

rswag-specs/lib/rswag/specs/example_group_helpers.rb

@@ -69,7 +69,7 @@ module Rswag
         metadata[:response][:examples] = example
       end
 
-      def run_test!
+      def run_test!(&block)
         # NOTE: rspec 2.x support
         if RSPEC_VERSION < 3
           before do
@@ -77,7 +77,7 @@ module Rswag
           end
 
           it "returns a #{metadata[:response][:code]} response" do
-            assert_response_matches_metadata(example.metadata)
+            assert_response_matches_metadata(example.metadata, &block)
           end
         else
           before do |example|
@@ -85,7 +85,7 @@ module Rswag
           end
 
           it "returns a #{metadata[:response][:code]} response" do |example|
-            assert_response_matches_metadata(example.metadata)
+            assert_response_matches_metadata(example.metadata, &block)
           end
         end
       end

rswag-specs/lib/rswag/specs/example_helpers.rb

@@ -28,10 +28,10 @@ module Rswag
         end
       end
 
-      def assert_response_matches_metadata(api_metadata)
+      def assert_response_matches_metadata(api_metadata, &block)
         global_metadata = rswag_config.get_swagger_doc(api_metadata[:swagger_doc])
         validator = ResponseValidator.new(api_metadata, global_metadata)
-        validator.validate!(response)
+        validator.validate!(response, &block)
       end
 
       private

rswag-specs/lib/rswag/specs/response_validator.rb

@@ -1,5 +1,6 @@
 require 'active_support/core_ext/hash/slice'
 require 'json-schema'
+require 'json'
 require 'rswag/specs/extended_schema'
 
 module Rswag
@@ -11,10 +12,10 @@ module Rswag
         @global_metadata = global_metadata
       end
 
-      def validate!(response)
+      def validate!(response, &block)
         validate_code!(response.code)
         validate_headers!(response.headers)
-        validate_body!(response.body)
+        validate_body!(response.body, &block)
       end
 
       private
@@ -34,7 +35,7 @@ module Rswag
         end
       end
 
-      def validate_body!(body)
+      def validate_body!(body, &block)
         response_schema = @api_metadata[:response][:schema]
         return if response_schema.nil?
 
@@ -46,6 +47,8 @@ module Rswag
         rescue JSON::Schema::ValidationError => ex
           raise UnexpectedResponse, "Expected response body to match schema: #{ex.message}"
         end
+
+        block.call(JSON.parse(body)) if block_given?
       end
     end