EnumNodeDefinition example

namespace Symfony\Component\Config\Tests\Definition\Builder;

use PHPUnit\Framework\TestCase;
use Symfony\Component\Config\Definition\Builder\EnumNodeDefinition;

class EnumNodeDefinitionTest extends TestCase
{
    public function testWithOneValue()
    {
        $def = new EnumNodeDefinition('foo');
        $def->values(['foo']);

        $node = $def->getNode();
        $this->assertEquals(['foo'], $node->getValues());
    }

    public function testNoValuesPassed()
    {
        $this->expectException(\RuntimeException::class);
        $this->expectExceptionMessage('You must call ->values() on enum nodes.');
        $def = new EnumNodeDefinition('foo');