add tests

tests/swoole_process_pool/detach.phpt

@@ -0,0 +1,68 @@
+--TEST--
+swoole_process_pool: detach
+--SKIPIF--
+<?php require __DIR__ . '/../include/skipif.inc';
+?>
+--FILE--
+<?php
+require __DIR__ . '/../include/bootstrap.php';
+
+use Swoole\Process\Pool;
+use Swoole\Atomic;
+
+const N = 100;
+
+$atomic = new Atomic();
+
+$pm = new ProcessManager;
+$pm->initFreePorts();
+
+$pm->parentFunc = function ($pid) use ($pm, $atomic) {
+    foreach (range(1, 2) as $i) {
+        $fp = stream_socket_client("tcp://127.0.0.1:".$pm->getFreePort(), $errno, $errstr) or die("error: $errstr\n");
+        $msg =  "HELLO-{$i}";
+        fwrite($fp, pack('N', strlen($msg)) . $msg);
+    }
+    $pm->wait();
+    Assert::eq($atomic->get(), N + 1);
+    echo "DONE\n";
+    $pm->kill();
+};
+
+$pm->childFunc = function () use ($pm, $atomic) {
+    $pool = new Pool(1, SWOOLE_IPC_SOCKET);
+
+    $pool->on('WorkerStart', function (Pool $pool, $workerId) use($pm, $atomic) {
+        echo("[Worker #{$workerId}] WorkerStart\n");
+         if ($atomic->get() == 0) {
+             $pm->wakeup();
+         }
+    });
+
+    $pool->on('Message', function (Pool $pool, $msg) use($pm, $atomic) {
+        if ($atomic->get() == 0) {
+            $atomic->add();
+            $pool->detach();
+            $n = N;
+            while($n--) {
+                usleep(1000);
+                $atomic->add();
+            }
+            $pm->wakeup();
+        } else {
+            echo $msg.PHP_EOL;
+        }
+    });
+
+    $pool->listen('127.0.0.1', $pm->getFreePort());
+    $pool->start();
+};
+
+$pm->childFirst();
+$pm->run();
+?>
+--EXPECT--
+[Worker #0] WorkerStart
+[Worker #0] WorkerStart
+HELLO-2
+DONE