public function testIncrementWithScope()
{
$adapter = new File(array('scope' => 'primary'));
$this->File->write(array('primary_key1' => 5));
$this->File->write(array('key1' => 10));
$expected = 6;
$result = $adapter->increment('key1');
$this->assertEqual($expected, $result);
$expected = array('key1' => 6);
$result = $adapter->read(array('key1'));
$this->assertEqual($expected, $result);
}