public function testPop() { $array = new ArrayObject('test1', 'test2'); $this->assertSame(2, $array->getLength()); $this->assertSame('test2', $array->pop()); $this->assertSame(1, $array->getLength()); $this->assertSame('test1', $array->pop()); $this->assertSame(0, $array->getLength()); $this->assertSame(null, $array->pop()); }