1 files changed, 35 insertions, 7 deletions
diff --git a/actionpack/lib/action_dispatch/testing/test_response.rb b/actionpack/lib/action_dispatch/testing/test_response.rb
index a9b88ac5fd..1e6b21f235 100644
--- a/actionpack/lib/action_dispatch/testing/test_response.rb
+++ b/actionpack/lib/action_dispatch/testing/test_response.rb
@@ -1,3 +1,7 @@
+# frozen_string_literal: true
+
+require "action_dispatch/testing/request_encoder"
+
 module ActionDispatch
   # Integration test methods such as ActionDispatch::Integration::Session#get
   # and ActionDispatch::Integration::Session#post return objects of class
@@ -7,19 +11,43 @@ module ActionDispatch
   # See Response for more information on controller response objects.
   class TestResponse < Response
     def self.from_response(response)
-      new response.status, response.headers, response.body, default_headers: nil
+      new response.status, response.headers, response.body
+    end
+
+    def initialize(*) # :nodoc:
+      super
+      @response_parser = RequestEncoder.parser(content_type)
     end
 
     # Was the response successful?
-    alias_method :success?, :successful?
+    def success?
+      ActiveSupport::Deprecation.warn(<<-MSG.squish)
+       The success? predicate is deprecated and will be removed in Rails 6.0.
+       Please use successful? as provided by Rack::Response::Helpers.
+      MSG
+      successful?
+    end
 
     # Was the URL not found?
-    alias_method :missing?, :not_found?
-
-    # Were we redirected?
-    alias_method :redirect?, :redirection?
+    def missing?
+      ActiveSupport::Deprecation.warn(<<-MSG.squish)
+       The missing? predicate is deprecated and will be removed in Rails 6.0.
+       Please use not_found? as provided by Rack::Response::Helpers.
+      MSG
+      not_found?
+    end
 
     # Was there a server-side error?
-    alias_method :error?, :server_error?
+    def error?
+      ActiveSupport::Deprecation.warn(<<-MSG.squish)
+       The error? predicate is deprecated and will be removed in Rails 6.0.
+       Please use server_error? as provided by Rack::Response::Helpers.
+      MSG
+      server_error?
+    end
+
+    def parsed_body
+      @parsed_body ||= @response_parser.call(body)
+    end
   end
 end