add new test

ext/gd/tests/001.phpt

@@ -0,0 +1,25 @@
+--TEST--
+imagecreatefrompng() and empty/missing file
+--SKIPIF--
+<?php if (!function_exists("imagecreatefrompng")) print "skip"; ?>
+--FILE--
+<?php
+
+$file = dirname(__FILE__)."/001.test";
+@unlink($file);
+
+var_dump(imagecreatefrompng($file));
+touch($file);
+var_dump(imagecreatefrompng($file));
+
+@unlink($file);
+
+echo "Done\n";
+?>
+--EXPECTF--	
+Warning: imagecreatefrompng(%s001.test): failed to open stream: No such file or directory in %s on line %d
+bool(false)
+
+Warning: imagecreatefrompng(): '%s001.test' is not a valid PNG file in %s on line %d
+bool(false)
+Done