ZF\Apigility\Admin\Controller\FsPermissionsController::fsPermissionsAction PHP Method

    public function fsPermissionsAction()
    {
        $isWritable = $this->configIsWritable() && $this->moduleIsWritable();
        $viewModel = new ViewModel(['fs_perms' => $isWritable, 'www_user' => getenv('USER') ?: '']);
        return $viewModel;
    }

 public function testReturnsFalseIfNeitherConfigNorModuleDirectoriesExistAndRootIsNotWritable()
 {
     if (!file_exists('/var/log') || !is_dir('/var/log') || is_writable('/var/log')) {
         $this->markTestSkipped('Cannot test, as either /var/log does not exist or is writable');
     }
     chdir('/var/log');
     // Instantiating new controller, as constructor caches getcwd()
     $controller = new FsPermissionsController();
     $result = $controller->fsPermissionsAction();
     $this->assertInstanceOf('ZF\\ContentNegotiation\\ViewModel', $result);
     $fsPerms = $result->getVariable('fs_perms', null);
     $this->assertNotNull($fsPerms);
     $this->assertFalse($fsPerms);
 }