Add basic test for posix getgrnam

Author: xrmx

ext/posix/tests/posix_getgrnam_basic.phpt

@@ -0,0 +1,27 @@
+--TEST--
+Test posix_getgrnam() function : basic functionality
+--SKIPIF--
+<?php
+	if (!extension_loaded('posix')) die('skip - POSIX extension not loaded');
+?>
+--FILE--
+<?php
+  $groupid = posix_getgroups()[0];
+  $group = posix_getgrgid($groupid);
+  $groupinfo = posix_getgrnam($group["name"]);
+  var_dump($groupinfo);
+  $groupinfo = posix_getgrnam("");
+  var_dump($groupinfo);
+?>
+--EXPECTF--
+array(4) {
+  ["name"]=>
+  string(%d) "%s"
+  ["passwd"]=>
+  string(1) "%s"
+  ["members"]=>
+%a
+  ["gid"]=>
+  int(%d)
+}
+bool(false)