fix(WebpackerTest) reload manifest before running test

Author: rmosolgo

test/react/rails/webpacker_test.rb

@@ -2,13 +2,17 @@
 
 
 when_webpacker_available do
-  class ReactRailsUJSTest < ActionDispatch::IntegrationTest
+  class ReactRailsWebpackerTest < ActionDispatch::IntegrationTest
     include Capybara::DSL
 
     setup do
       Capybara.current_driver = Capybara.javascript_driver
     end
 
+    teardown do
+      clear_webpacker_packs
+    end
+
     test 'it mounts pages from the pack' do
       visit '/pack_component'
       assert page.has_content?('Export Default')

test/test_helper.rb

@@ -133,13 +133,21 @@ def when_sprockets_available
 
 def when_webpacker_available
   if defined?(Webpacker)
+    clear_webpacker_packs
     Dir.chdir("./test/dummy") do
       Rake::Task['webpacker:compile'].invoke
     end
+    # Reload cached JSON manifest:
+    Webpacker::Manifest.load
     yield
   end
 end
 
+def clear_webpacker_packs
+  packs_directory = File.expand_path("../dummy/public/packs", __FILE__)
+  FileUtils.rm_rf(packs_directory)
+end
+
 def fetch_asset_body(asset_logical_path)
   Rails.application.assets[asset_logical_path].to_s
 end