tests/RateLimiterTest.php
<?php

declare(strict_types=1);

namespace WebPageTest;

use WebPageTest\RateLimiter;
use PHPUnit\Framework\TestCase;

final class RateLimiterTest extends TestCase
{
    public function testConstructorSetsDefaultValues(): void
    {
        $ip = '127.0.0.1';
        $cmrl = new RateLimiter($ip);
        $this->assertEquals('127.0.0.1', $cmrl->ip);
        $this->assertEquals(50, $cmrl->limit);
        $this->assertEquals(2419200, $cmrl->day_cycle_ttl);
        $this->assertEquals('rladdr_per_month_127.0.0.1', $cmrl->cache_key);
    }

    public function testConstructorSetsValues(): void
    {
        $ip = '127.0.0.0';
        $cmrl = new RateLimiter($ip, 40, 20);
        $this->assertEquals('127.0.0.0', $cmrl->ip);
        $this->assertEquals(40, $cmrl->limit);
        $this->assertEquals(1728000, $cmrl->day_cycle_ttl);
        $this->assertEquals('rladdr_per_month_127.0.0.0', $cmrl->cache_key);
    }

  /**
   *
   * @requires extension apcu
   */
    public function testCheckFirstTime(): void
    {
        $ip = '127.0.0.2';
        $cmrl = new RateLimiter($ip, 40, 20);
        $passes = $cmrl->check(1);
        $this->assertTrue($passes);
    }

  /**
   *
   * @requires extension apcu
   */
    public function testCheckPastLimit(): void
    {
        $ip = '127.0.0.3';
        $cmrl = new RateLimiter($ip, 2, 20);
        $passes = $cmrl->check(1);
        $passes = $cmrl->check(1);
        $passes = $cmrl->check(1);
        $this->assertFalse($passes);
    }

  /**
   *
   * @requires extension apcu
   */
    public function testCheckLastNumberGoesPastButStillPasses(): void
    {
        $ip = '127.0.0.4';
        $cmrl = new RateLimiter($ip, 40, 20);
        $passes = $cmrl->check(20);
        $passes = $cmrl->check(19);
        $passes = $cmrl->check(20);
        $this->assertTrue($passes);
    }

  /**
   *
   * @requires extension apcu
   */
    public function testCheckPastLimitLargeNumbers(): void
    {
        $ip = '127.0.0.5';
        $cmrl = new RateLimiter($ip, 40, 20);
        $passes = $cmrl->check(20);
        $passes = $cmrl->check(19);
        $passes = $cmrl->check(20);
        $passes = $cmrl->check(1);
        $this->assertFalse($passes);
    }
}
