When KeyTab is created with keytab file it's obvious that keytab:exist() will return true.
It's a fair expectation if KeyTab created without keytab file keytab:exist() will return false? Observed that the exist() method look in default locations on the machine for the keytab file. Which is not specified in the spec.

If this is the case , the expectation if KeyTab created without keytab file keytab:exist() will return false might not true in all cases?