System Test:
- temp dir = /tmp
- temp dir exists = 1
- temp file name gen = /tmp/$$gs_VW4qvn
- temp file gen = 1
- temp file exists = yes
- temp file readable = yes
- temp file writeable = yes
- temp file unlink = yes
- temp file exists = no
string(0) ""
array(0) {
}
int(0)
array(2) {
  ["width"]=>
  int(2591)
  ["height"]=>
  int(2169)
}