Fixup various fakes for Rails 5 testing.

spec/rspec/rails/example/mailer_example_group_spec.rb

@@ -5,6 +5,7 @@ module RSpec::Rails
     module ::Rails; end
     before do
       allow(Rails).to receive_message_chain(:application, :routes, :url_helpers).and_return(Rails)
+      allow(Rails.application).to receive(:config).and_return(double("Rails.application.config").as_null_object)
       allow(Rails).to receive_message_chain(:configuration, :action_mailer, :default_url_options).and_return({})
     end
 

spec/rspec/rails/matchers/have_http_status_spec.rb

@@ -4,21 +4,27 @@
   include RSpec::Rails::Matchers
 
   def create_response(opts = {})
-    ActionDispatch::TestResponse.new(opts.fetch(:status))
+    ActionDispatch::TestResponse.new(opts.fetch(:status)).tap {|x|
+      x.request = ActionDispatch::Request.new({})
+    }
   end
 
   shared_examples_for "supports different response instances" do
     context "given an ActionDispatch::Response" do
       it "returns true for a response with the same code" do
-        response = ::ActionDispatch::Response.new(code)
+        response = ::ActionDispatch::Response.new(code).tap {|x|
+          x.request = ActionDispatch::Request.new({})
+        }
 
         expect( matcher.matches?(response) ).to be(true)
       end
     end
 
     context "given an ActionDispatch::TestResponse" do
       it "returns true for a response with the same code" do
-        response = ::ActionDispatch::TestResponse.new(code)
+        response = ::ActionDispatch::TestResponse.new(code).tap {|x|
+          x.request = ActionDispatch::Request.new({})
+        }
 
         expect( matcher.matches?(response) ).to be(true)
       end

spec/support/ar_classes.rb

@@ -13,6 +13,8 @@ def self.extended(host)
         nonexistent_model_id integer
       )
     eosql
+
+    host.reset_column_information
   end
 end