public function testCantGetChildrenNames()
 {
     $column = $this->getColumnMock('created_at', array('inheritance' => true));
     $column->expects($this->any())->method('isEnumeratedClasses')->will($this->returnValue(false));
     $table = new Table('books');
     $table->addColumn($column);
     $this->assertNull($table->getChildrenNames());
 }