createFromPreviousWindow example

    public function consume(int $tokens = 1): RateLimit
    {
        $this->lock?->acquire(true);

        try {
            $window = $this->storage->fetch($this->id);
            if (!$window instanceof SlidingWindow) {
                $window = new SlidingWindow($this->id, $this->interval);
            } elseif ($window->isExpired()) {
                $window = SlidingWindow::createFromPreviousWindow($window, $this->interval);
            }

            $hitCount = $window->getHitCount();
            $availableTokens = $this->getAvailableTokens($hitCount);
            if ($availableTokens < $tokens) {
                return new RateLimit($availableTokens, $window->getRetryAfter(), false, $this->limit);
            }

            $window->add($tokens);

            if (0 < $tokens) {
                

public function testGetExpirationTime()
    {
        $window = new SlidingWindow('foo', 10);
        $this->assertSame(2 * 10, $window->getExpirationTime());
        $this->assertSame(2 * 10, $window->getExpirationTime());

        $data = serialize($window);
        sleep(10);
        $cachedWindow = unserialize($data);
        $this->assertSame(10, $cachedWindow->getExpirationTime());

        $new = SlidingWindow::createFromPreviousWindow($cachedWindow, 15);
        $this->assertSame(2 * 15, $new->getExpirationTime());

        usleep(10.1);
        $this->assertIsInt($new->getExpirationTime());
    }

    public function testInvalidInterval()
    {
        $this->expectException(InvalidIntervalException::class);
        new SlidingWindow('foo', 0);
    }