Fix CI (puma#2561)

1. Add racc to Gemfile for JRuby RuboCop
2. test_busy_worker - skip teardown
3. test_integration_single - patch from PR 2560

Gemfile

@@ -15,6 +15,8 @@ gem "minitest-stub-const"
 gem "sd_notify"
 
 gem "jruby-openssl", :platform => "jruby"
+# needed for rubocop
+gem "racc", :platform => "jruby"
 
 gem "rubocop", "~> 0.58.0"
 

test/helpers/integration.rb

@@ -204,7 +204,7 @@ def hot_restart_does_not_drop_connections(num_threads: 1, total_requests: 500)
     args = "-w #{workers} -t 0:5 -q test/rackup/hello_with_delay.ru"
     if Puma.windows?
       @control_tcp_port = UniquePort.call
-      cli_server "#{args} --control-url tcp://#{HOST}:#{@control_tcp_port} --control-token #{TOKEN}"
+      cli_server "--control-url tcp://#{HOST}:#{@control_tcp_port} --control-token #{TOKEN} #{args}"
     else
       cli_server args
     end

test/test_busy_worker.rb

@@ -9,6 +9,7 @@ def setup
   end
 
   def teardown
+    return if skipped?
     @server.stop(true) if @server
     @ios.each {|i| i.close unless i.closed?}
   end

test/test_integration_single.rb

@@ -165,9 +165,17 @@ def test_puma_started_log_writing
   end
 
   def test_application_logs_are_flushed_on_write
-    cli_server 'test/rackup/write_to_stdout.ru'
+    @control_tcp_port = UniquePort.call
+    cli_server "--control-url tcp://#{HOST}:#{@control_tcp_port} --control-token #{TOKEN} test/rackup/write_to_stdout.ru"
+
     read_body connect
-    log_line = @server.gets
-    assert_equal "hello\n", log_line
+
+    cli_pumactl 'stop'
+
+    assert_equal "hello\n", @server.gets
+    assert_includes @server.read, 'Goodbye!'
+
+    @server.close unless @server.closed?
+    @server = nil
   end
 end