Validation handler for simpletest_settings_form().
function simpletest_settings_form_validate($form, &$form_state) {
// If a username was provided but a password wasn't, preserve the existing
// password.
if (!empty($form_state['values']['simpletest_httpauth_username']) && empty($form_state['values']['simpletest_httpauth_password'])) {
$form_state['values']['simpletest_httpauth_password'] = config('simpletest.settings')
->get('httpauth.password');
}
// If a password was provided but a username wasn't, the credentials are
// incorrect, so throw an error.
if (empty($form_state['values']['simpletest_httpauth_username']) && !empty($form_state['values']['simpletest_httpauth_password'])) {
form_set_error('simpletest_httpauth_username', t('HTTP authentication credentials must include a username in addition to a password.'));
}
}