src/Context/Form/FormContext.php
public function assertTextualField($selector, $not, $expected)
    {
        (new FormValueAssertion($this, $selector, $not, $expected))->textual();
    }
public function assertTextualField($selector, $not, $expected)
    {
        (new FormValueAssertion($this, $selector, $not, $expected))->textual();
    }
@example
And check that "Users" field has "admin" value
And check that "Users" field has not "customer" value

@Then /^(?:|I )check that "([^"]*)" field has(| not) "([^"]*)" value$/