Add test for Puma::Server.current.

test/test_puma_server_current.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+# Released under the MIT License.
+# Copyright, 2023, by Samuel Williams.
+
+require_relative "helper"
+
+require "puma/server"
+
+class PumaServerCurrentApplication
+  def call(env)
+    [200, {"Content-Type" => "text/plain"}, [Puma::Server.current.to_s]]
+  end
+end
+
+class PumaServerCurrentTest < Minitest::Test
+  parallelize_me!
+
+  def setup
+    @tester = PumaServerCurrentApplication.new
+    @server = Puma::Server.new @tester, nil, {log_writer: Puma::LogWriter.strings, clean_thread_locals: true}
+    @port = (@server.add_tcp_listener "127.0.0.1", 0).addr[1]
+    @tcp = "http://127.0.0.1:#{@port}"
+    @url = URI.parse(@tcp)
+    @server.run
+  end
+
+  def teardown
+    @server.stop(true)
+  end
+
+  def test_empty_locals
+    server_string = @server.to_s
+    responses = []
+
+    # This must be a persistent connection to hit the `clean_thread_locals` code path.
+    Net::HTTP.new(@url.host, @url.port).start do |connection|
+      3.times do
+        responses << connection.get("/").body
+      end
+    end
+
+    assert_equal [server_string]*3, responses
+  end
+end