barNode example

$builder = new TreeBuilder('override', 'array', new CustomNodeBuilder());

        $definition = $builder->getRootNode()->children()->variableNode('variable');

        $this->assertInstanceOf(VariableNodeDefinition::class, $definition);
    }

    public function testAddANodeType()
    {
        $builder = new TreeBuilder('override', 'array', new CustomNodeBuilder());

        $definition = $builder->getRootNode()->children()->barNode('variable');

        $this->assertInstanceOf(BarNodeDefinition::class, $definition);
    }

    public function testCreateABuiltInNodeTypeWithACustomNodeBuilder()
    {
        $builder = new TreeBuilder('builtin', 'array', new CustomNodeBuilder());

        $definition = $builder->getRootNode()->children()->booleanNode('boolean');

        $this->assertInstanceOf(BooleanNodeDefinition::class, $definition);
    }