Add the actual test for FPM prod idle timeout test with 6s sleep

sapi/fpm/tests/proc-idle-timeout.phpt

@@ -0,0 +1,53 @@
+--TEST--
+FPM: Process manager config pm.process_idle_timeout
+--SKIPIF--
+<?php
+include "skipif.inc";
+if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
+?>
+--FILE--
+<?php
+
+require_once "tester.inc";
+
+$cfg = <<<EOT
+[global]
+error_log = {{FILE:LOG}}
+[unconfined]
+listen = {{ADDR}}
+pm = ondemand
+pm.max_children = 3
+pm.process_idle_timeout = 1
+pm.status_path = /status
+EOT;
+
+$code = <<<EOT
+<?php
+usleep(200);
+EOT;
+
+$tester = new FPM\Tester($cfg, $code);
+$tester->start();
+$tester->expectLogStartNotices();
+$tester->multiRequest(2);
+$tester->status([
+    'total processes' => 2,
+]);
+// wait for process idle timeout
+sleep(6);
+$tester->status([
+    'total processes' => 1,
+]);
+$tester->terminate();
+$tester->expectLogTerminatingNotices();
+$tester->close();
+
+?>
+Done
+--EXPECT--
+Done
+--CLEAN--
+<?php
+require_once "tester.inc";
+FPM\Tester::clean();
+?>