NilPortugues\Sql\QueryBuilder\Manipulation\Select::isJoin PHP Method

    public function isJoin($isJoin = true)
    {
        return $this->joinQuery->setJoin($isJoin);
    }

 /**
  * @test
  */
 public function itShouldWriteJoin()
 {
     $this->query->isJoin(true)->setTable('user')->on()->equals('user_id', 1);
     $expected = 'JOIN user ON (user.user_id = :v1)';
     $this->assertSame($expected, $this->writer->write($this->query));
     $expected = array(':v1' => 1);
     $this->assertEquals($expected, $this->writer->getValues());
 }