function testIntegratedQueryKeys() { $numbers = new qinq\Collection([1 => 'animal', 2 => 'item', 3 => 'bob', 4 => 'cat']); $matches = range(1, 4); foreach ($numbers->keys() as $number) { $match = array_shift($matches); $this->assertEquals($match, $number); } $this->assertEquals(4, $numbers->keys()->last()); $this->assertEquals(1, $numbers->keys()->first()); }