public function testShift()
{
$this->assertHasSpot('1 >> -1;');
$this->assertNotSpot('1 >> 1;');
$this->assertHasSpot('$a >> -1;');
$this->assertNotSpot('$a >> 1;');
$this->assertHasSpot('1 << -1;');
$this->assertNotSpot('1 << 1;');
$this->assertHasSpot('1 << $a;');
$this->assertNotSpot('1 << 0;');
}