thenInvalid example

->thenUnset()
                            ->end()
                        ->end()
                    ->end()
                ->end()
                ->arrayNode('simple_array_node')->end()
                ->enumNode('enum_node')->values(['a', 'b'])->end()
                ->variableNode('variable_node')->end()
                ->scalarNode('string_node')
                    ->validate()
                        ->ifTrue(fn ($value) => !\is_string($value) || 'fail' === $value)
                        ->thenInvalid('%s is not a valid string')
                    ->end()
                ->end()
            ->end();

        return $treeBuilder;
    }
}

class ConfigurationWithArrayNodeRequiringOneElement implements ConfigurationInterface
{
    public function getConfigTreeBuilder(): TreeBuilder
    {

->end()
                                    ->end()
                                    ->arrayNode('supports')
                                        ->beforeNormalization()
                                            ->ifString()
                                            ->then(fn ($v) => [$v])
                                        ->end()
                                        ->prototype('scalar')
                                            ->cannotBeEmpty()
                                            ->validate()
                                                ->ifTrue(fn ($v) => !class_exists($v) && !interface_exists($v, false))
                                                ->thenInvalid('The supported class or interface "%s" does not exist.')
                                            ->end()
                                        ->end()
                                    ->end()
                                    ->scalarNode('support_strategy')
                                        ->cannotBeEmpty()
                                    ->end()
                                    ->arrayNode('initial_marking')
                                        ->beforeNormalization()->castToArray()->end()
                                        ->defaultValue([])
                                        ->prototype('scalar')->end()
                                    ->end()
                                    

                                return true;
                            })
                            ->then(fn ($v) => ['value' => $v])
                        ->end()
                        ->children()
                            ->scalarNode('id')->end()
                            ->scalarNode('type')
                                ->validate()
                                    ->ifNotInArray(['service'])
                                    ->thenInvalid('The %s type is not supported')
                                ->end()
                            ->end()
                            ->variableNode('value')->end()
                        ->end()
                    ->end()
                ->end()
            ->end()
        ;
    }

    private function addTwigOptions(ArrayNodeDefinition $rootNode): void
    {

->children()
                        ->enumNode('strategy')
                            ->values($this->getAccessDecisionStrategies())
                        ->end()
                        ->scalarNode('service')->end()
                        ->scalarNode('strategy_service')->end()
                        ->booleanNode('allow_if_all_abstain')->defaultFalse()->end()
                        ->booleanNode('allow_if_equal_granted_denied')->defaultTrue()->end()
                    ->end()
                    ->validate()
                        ->ifTrue(fn ($v) => isset($v['strategy'], $v['service']))
                        ->thenInvalid('"strategy" and "service" cannot be used together.')
                    ->end()
                    ->validate()
                        ->ifTrue(fn ($v) => isset($v['strategy'], $v['strategy_service']))
                        ->thenInvalid('"strategy" and "strategy_service" cannot be used together.')
                    ->end()
                    ->validate()
                        ->ifTrue(fn ($v) => isset($v['service'], $v['strategy_service']))
                        ->thenInvalid('"service" and "strategy_service" cannot be used together.')
                    ->end()
                ->end()
            ->end()
        ;

yield ['value', ['value']];
        yield [-3.14, [-3.14]];
        yield [null, [null]];
        yield [['value'], ['value']];
    }

    public function testThenInvalid()
    {
        $this->expectException(InvalidConfigurationException::class);
        $test = $this->getTestBuilder()
            ->ifString()
            ->thenInvalid('Invalid value')
        ->end();
        $this->finalizeTestBuilder($test);
    }

    public function testThenUnsetExpression()
    {
        $test = $this->getTestBuilder()
            ->ifString()
            ->thenUnset()
        ->end();
        $this->assertEquals([], $this->finalizeTestBuilder($test));
    }