add test for vips_image_write_to_file options

package.xml

@@ -65,6 +65,7 @@ http://pear.php.net/dtd/package-2.0.xsd">
     <file role='test' name='028.phpt'/>
     <file role='test' name='029.phpt'/>
     <file role='test' name='030.phpt'/>
+    <file role='test' name='031.phpt'/>
 
     <dir name="images">
      <file role='test' name='img_0076.jpg'/>

tests/031.phpt

@@ -0,0 +1,31 @@
+--TEST--
+write_to_file can set options
+--SKIPIF--
+<?php if (!extension_loaded("vips")) print "skip"; ?>
+--FILE--
+<?php 
+  $filename = dirname(__FILE__) . "/images/img_0076.jpg";
+  $image = vips_image_new_from_file($filename)["out"];
+  $output_filename1 = dirname(__FILE__) . "/x.jpg";
+  $output_filename2 = dirname(__FILE__) . "/y.jpg";
+
+  vips_image_write_to_file($image, $output_filename1, ["Q" => 20]);
+  vips_image_write_to_file($image, $output_filename2, ["Q" => 90]);
+
+  $buffer1 = file_get_contents($output_filename1);
+  $buffer2 = file_get_contents($output_filename2);
+
+  if (strlen($buffer1) < strlen($buffer2)) {
+	echo "pass";
+  }
+?>
+--EXPECT--
+pass
+--CLEAN--
+<?php
+  $output_filename = dirname(__FILE__) . "/x.jpg";
+  unlink($output_filename);
+  $output_filename = dirname(__FILE__) . "/y.jpg";
+  unlink($output_filename);
+?>
+

vips.c

@@ -3,8 +3,8 @@
  */
 
 /* Uncomment for some logging.
- */
 #define VIPS_DEBUG
+ */
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"