Add test case for response header (#2413)

- skipped test include

test/test_response_header.rb

@@ -0,0 +1,140 @@
+require_relative "helper"
+require "puma/events"
+require "net/http"
+
+class TestResponseHeader < Minitest::Test
+  parallelize_me!
+
+  def setup
+    @host = "127.0.0.1"
+
+    @ios = []
+
+    @app = ->(env) { [200, {}, [env['rack.url_scheme']]] }
+
+    @events = Puma::Events.strings
+    @server = Puma::Server.new @app, @events
+  end
+
+  def teardown
+    @server.stop(true)
+    @ios.each { |io| io.close if io && !io.closed? }
+  end
+
+  def server_run(app: @app, early_hints: false)
+    @server.app = app
+    @port = (@server.add_tcp_listener @host, 0).addr[1]
+    @server.early_hints = true if early_hints
+    @server.run
+  end
+
+  def send_http_and_read(req)
+    send_http(req).read
+  end
+
+  def send_http(req)
+    new_connection << req
+  end
+
+  def new_connection
+    TCPSocket.new(@host, @port).tap {|sock| @ios << sock}
+  end
+
+  # The header keys must be Strings
+  def test_integer_key
+    server_run app: ->(env) { [200, { 1 => 'Boo'}, []] }
+    data = send_http_and_read "GET / HTTP/1.0\r\n\r\n"
+
+    assert_match(/HTTP\/1.1 500 Internal Server Error/, data)
+  end
+
+  # The header must respond to each
+  def test_nil_header
+    server_run app: ->(env) { [200, nil, []] }
+    data = send_http_and_read "GET / HTTP/1.0\r\n\r\n"
+
+    assert_match(/HTTP\/1.1 500 Internal Server Error/, data)
+  end
+
+  # The values of the header must be Strings
+  def test_integer_value
+    server_run app: ->(env) { [200, {'Content-Length' => 500}, []] }
+    data = send_http_and_read "GET / HTTP/1.0\r\n\r\n"
+
+    assert_match(/HTTP\/1.0 200 OK\r\nContent-Length: 500\r\n\r\n/, data)
+  end
+
+  def assert_ignore_header(name, value, opts={})
+    header = { name => value }
+
+    if opts[:early_hints]
+      app = ->(env) do
+        env['rack.early_hints'].call(header)
+        [200, {}, ['Hello']]
+      end
+    else
+      app = -> (env) { [200, header, ['hello']]}
+    end
+
+    server_run(app: app, early_hints: opts[:early_hints])
+    data = send_http_and_read "GET / HTTP/1.0\r\n\r\n"
+
+    refute_match("#{name}: #{value}", data)
+  end
+
+  # The header must not contain a Status key.
+  def test_status_key
+    skip 'implement later'
+
+    assert_ignore_header("Status", "500")
+  end
+
+  # Special headers starting “rack.” are for communicating with the server, and must not be sent back to the client.
+  def test_rack_key
+    skip 'implement later'
+
+    assert_ignore_header("rack.command_to_server_only", "work")
+  end
+
+
+  # testing header key must conform rfc token specification
+  # i.e. cannot contain non-printable ASCII, DQUOTE or “(),/:;<=>?@[]{}”.
+  # Header keys will be set through two ways: Regular and early hints.
+
+  def test_illegal_character_in_key
+    skip 'implement later'
+    assert_ignore_header("\"F\u0000o\u0025(@o}", "Boo")
+  end
+
+  def test_illegal_character_in_key_when_early_hints
+    skip 'implement later'
+    assert_ignore_header("\"F\u0000o\u0025(@o}", "Boo", early_hints: true)
+  end
+
+  # testing header value can be separated by \n into line, and each line must not contain characters below 037
+  # Header values can be set through three ways: Regular, early hints and a special case for overriding content-length
+
+  def test_illegal_character_in_value
+    skip 'implement later'
+    assert_ignore_header("X-header", "First \000Lin\037e")
+  end
+
+  def test_illegal_character_in_value_when_early_hints
+    skip 'implement later'
+    assert_ignore_header("X-header", "First \000Lin\037e", early_hints: true)
+  end
+
+  def test_illegal_character_in_value_when_override_content_length
+    skip 'implement later'
+    assert_ignore_header("Content-Length", "\037")
+  end
+
+  def test_illegal_character_in_value_when_newline
+    skip 'implement later'
+
+    server_run app: ->(env) { [200, {'X-header' => "First\000 line\nSecond Lin\037e"}, ["Hello"]] }
+    data = send_http_and_read "GET / HTTP/1.0\r\n\r\n"
+
+    refute_match("X-header: First\000 line\r\nX-header: Second Lin\037e\r\n", data)
+  end
+end