Author: Harold Iedema (hiedema@hostnet.nl)
Inheritance: implements Symfony\Component\Config\Definition\ConfigurationInterface
 public function testGetConfigTreeBuilder()
 {
     $config = new Configuration([], [DefinePlugin::class, CSSLoader::class]);
     $tree = $config->getConfigTreeBuilder();
     $final = $tree->buildTree()->finalize([]);
     $this->assertArrayHasKey('node', $final);
     $this->assertArrayHasKey('binary', $final['node']);
     $this->assertArrayHasKey('win32', $final['node']['binary']);
     $this->assertArrayHasKey('win64', $final['node']['binary']);
     $this->assertArrayHasKey('linux_x32', $final['node']['binary']);
     $this->assertArrayHasKey('linux_x64', $final['node']['binary']);
     $this->assertArrayHasKey('darwin', $final['node']['binary']);
     $this->assertArrayHasKey('fallback', $final['node']['binary']);
 }