So the value of the field should be the first option selected.
As i see the problem is here
public function seeOptionIsSelected($select, $optionText)
{
$selected = $this->matchSelectedOption($select);
$this->assertDomContains($selected, 'selected option');
//If element is radio then we need to check value
$value = $selected->getNode(0)->tagName == 'option' ? $selected->text() : $selected->getNode(0)->getAttribute('value');
$this->assertEquals($optionText, $value);
}
This situation can be tested with the following:
$I->seeElement("#id_of_the_select_box");
$I->dontSeeElement("#id_of_the_select_box option[selected='selected']");