src/Context/Form/FormContext.php
public function assertSelectableField($expected, $not, $selector)
    {
        (new FormValueAssertion($this, $selector, $not, $expected))->selectable();
    }
public function assertSelectableField($expected, $not, $selector)
    {
        (new FormValueAssertion($this, $selector, $not, $expected))->selectable();
    }
@example
And check that "User" is selected in "Apply to" select
And check that "Product(s)" is not selected in "Apply to" select

@Then /^(?:|I )check that "([^"]*)" is(| not) selected in "([^"]*)" select$/