public function testJoinColumns()
{
$select = new Select('project');
$select->cols(['pid' => 'project_id']);
$j = $select->join('user', 'user_id');
$j->cols(['user_email' => 'email']);
$c = $select->getAllColumns();
$this->assertCount(2, $c);
$this->assertEquals('pid', $c[0]->getAlias());
$this->assertEquals('user_email', $c[1]->getAlias());
$this->assertEquals('project_id', $c[0]->getName());
$this->assertEquals('email', $c[1]->getName());
}
