public function testProvidesKeys()
{
$this->assertEquals(array(), $this->coll->getKeys());
$this->coll->merge(array('test1' => 'value1', 'test2' => 'value2'));
$this->assertEquals(array('test1', 'test2'), $this->coll->getKeys());
// Returns the cached array previously returned
$this->assertEquals(array('test1', 'test2'), $this->coll->getKeys());
$this->coll->remove('test1');
$this->assertEquals(array('test2'), $this->coll->getKeys());
$this->coll->add('test3', 'value3');
$this->assertEquals(array('test2', 'test3'), $this->coll->getKeys());
}
