Fix a bunch of test warnings

lib/puma/cli.rb

@@ -133,7 +133,7 @@ module Puma
           o.on "-f", "--fork-worker=[REQUESTS]", OptionParser::DecimalInteger,
             "Fork new workers from existing worker. Cluster mode only",
             "Auto-refork after REQUESTS (default 1000)" do |*args|
-            user_config.fork_worker *args.compact
+            user_config.fork_worker(*args.compact)
           end
 
           o.on "-I", "--include PATH", "Specify $LOAD_PATH directories" do |arg|

lib/puma/thread_pool.rb

@@ -337,11 +337,11 @@ module Puma
         # Wait for threads to finish without force shutdown.
         threads.each(&:join)
       else
-        join = ->(timeout) do
+        join = ->(inner_timeout) do
           start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
           threads.reject! do |t|
             elapsed = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
-            t.join timeout - elapsed
+            t.join inner_timeout - elapsed
           end
         end
 

test/test_integration_single.rb

@@ -49,7 +49,7 @@ class TestIntegrationSingle < TestIntegration
     cli_server "-C test/config/with_rackup_from_dsl.rb test/rackup/hello.ru"
     connection = connect
     reply = read_body(connection)
-    _, status = stop_server
+    stop_server
 
     assert_match("Hello World", reply)
   end

test/test_puma_server.rb

@@ -902,7 +902,7 @@ EOF
 
     s2 << "\r\n"
 
-    assert_match /204/, s1.gets
+    assert_match(/204/, s1.gets)
 
     assert IO.select([s2], nil, nil, app_delay), 'timeout waiting for response'
     s2_result = begin