@file Provides Image module hook implementations for testing purposes.
function image_module_test_file_download($uri) {
if (variable_get('image_module_test_file_download', FALSE) == $uri) {
return array(
'X-Image-Owned-By' => 'image_module_test',
);
}
if (variable_get('image_module_test_invalid_headers', FALSE) == $uri) {
return array(
'Content-Type' => 'image/png',
);
}
}