public function testSetNestedSetLeftKey()
 {
     $column = new Column();
     $column->setNestedSetLeftKey(true);
     $column->setNodeKeySep(',');
     $column->setNodeKey(true);
     $this->assertTrue($column->isNestedSetLeftKey());
     $this->assertTrue($column->isNodeKey());
     $this->assertSame(',', $column->getNodeKeySep());
 }