Wait for specific pid

Author: rmosolgo

test/support/webpacker_helpers.rb

@@ -90,7 +90,8 @@ def with_dev_server
     # Kill the server process
     puts "Killing webpack dev server"
     puts Process.kill("HUP", webpack_dev_server)
-    Process.wait
+    Process.wait(webpack_dev_server)
+    puts $?
     check_cmd = "lsof -i :8080 -S"
     puts check_cmd
     puts `#{check_cmd}`