Submit the system_config_form ensure the configuration has expected values.
public function testConfigForm() {
// Programmatically submit the given values.
foreach ($this->values as $form_key => $data) {
$values[$form_key] = $data['#value'];
}
$form_state = array(
'values' => $values,
);
drupal_form_submit($this->form, $form_state);
// Check that the form returns an error when expected, and vice versa.
$errors = form_get_errors();
$valid_form = empty($errors);
$args = array(
'%values' => print_r($values, TRUE),
'%errors' => $valid_form ? t('None') : implode(' ', $errors),
);
$this
->assertTrue($valid_form, format_string('Input values: %values<br/>Validation handler errors: %errors', $args));
foreach ($this->values as $data) {
$this
->assertEqual($data['#value'], config($data['#config_name'])
->get($data['#config_key']));
}
}