/**
* Should return true for associative, and false for plain.
*/
public function testIsAssoc()
{
$ops = new Ops();
$no = array(1, 2, 3, 4);
$yes = array('this' => 'is', 'associative');
$this->assertFalse($ops->_is_assoc($no));
$this->assertTrue($ops->_is_assoc($yes));
}