Fix No such file or directory tmp/cache issue in tests

Author: spastorino

test/generators/scaffold_controller_generator_test.rb

@@ -2,7 +2,7 @@
 # require 'active_model/serializer/railtie'
 
 class ResourceGeneratorTest < Rails::Generators::TestCase
-  destination File.expand_path('../../tmp', __FILE__)
+  destination File.expand_path('../../../tmp/generators', __FILE__)
   setup :prepare_destination, :copy_routes
 
   tests Rails::Generators::ResourceGenerator

test/generators/serializer_generator_test.rb

@@ -2,7 +2,7 @@
 require 'generators/serializer/serializer_generator'
 
 class SerializerGeneratorTest < Rails::Generators::TestCase
-  destination File.expand_path("../../tmp", __FILE__)
+  destination File.expand_path("../../../tmp/generators", __FILE__)
   setup :prepare_destination
 
   tests Rails::Generators::SerializerGenerator

test/test_helper.rb

@@ -6,6 +6,7 @@
 require 'action_controller/railtie'
 require 'active_support/json'
 require 'minitest/autorun'
+require 'fileutils'
 # Ensure backward compatibility with Minitest 4
 Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)
 
@@ -21,7 +22,7 @@ class Foo < Rails::Application
     ActionController::Base.cache_store = :memory_store
   end
 end
-ActionController::Base.cache_store.clear
+FileUtils.mkdir_p(File.expand_path('../../tmp/cache', __FILE__))
 Foo.initialize!
 
 require 'fixtures/poro'