run tests with bundler since that is what our users run

test/test_integration.rb

@@ -41,7 +41,11 @@ def teardown
   end
 
   def server(argv)
-    cmd = "#{Gem.ruby} -Ilib bin/puma -b tcp://127.0.0.1:#{@tcp_port} #{argv}"
+    # when we were started with bundler all load-paths and bin-paths are setup correctly
+    # this is what 9X% of users run, so it is what we should test
+    # the other case is solely for package builders or testing 1-off cases where the system puma is used
+    base = (defined?(Bundler) ? "bundle exec puma" : "#{Gem.ruby} -Ilib bin/puma")
+    cmd = "#{base} -b tcp://127.0.0.1:#{@tcp_port} #{argv}"
     @server = IO.popen(cmd, "r")
 
     wait_for_server_to_boot