tests question

What steps will reproduce the problem?

I made simple cache (array) and run tests. And its passed. But in my code i dont use ttl.
So in tests case not covered if cache expired.

<?php

namespace Wispoz\ArrayCache;

use Psr\SimpleCache\InvalidArgumentException;

class ArrayCache implements \Psr\SimpleCache\CacheInterface
{
    private const TTL_INFINITY = 0;
    private const TTL_EXPIRED = -1;

    private $cache = [];
    /**
     * @inheritDoc
     */
    public function get(string $key, mixed $default = null): mixed
    {

        $this->validateKey($key);
        if(array_key_exists($key,$this->cache)) {
            return is_object($this->cache[$key]) ? clone $this->cache[$key] :  $this->cache[$key];
        }
        return $default;
    }

    /**
     * @inheritDoc
     */
    public function set(string $key, mixed $value, null|int|\DateInterval $ttl = null): bool
    {
        $ttl = $this->normalizeTtl($ttl);
        $this->validateKey($key);
        if($ttl <= self::TTL_EXPIRED) {
            return $this->delete($key);
        }
        $this->cache[$key]  = is_object($value) ? clone $value : $value;
        return true;
    }

    /**
     * @inheritDoc
     */
    public function delete(string $key): bool
    {
        $this->validateKey($key);
        if(array_key_exists($key,$this->cache)){
            unset($this->cache[$key]);
            return true;
        }

        return false;
    }

    /**
     * @inheritDoc
     */
    public function clear(): bool
    {
        $this->cache = [];

        return true;
    }

    /**
     * @inheritDoc
     */
    public function getMultiple(iterable $keys, mixed $default = null): iterable
    {
        $keys = $this->fromIterable($keys);
        $this->validateKeys($keys);
        $output = [];
        foreach ($keys as $key) {
            $key = (string) $key;
            if(array_key_exists($key,$this->cache)) {
                $output[$key] = $this->cache[$key];
            }else {
                $output[$key] = $default;
            }
        }
        return $output;
    }

    /**
     * @inheritDoc
     */
    public function setMultiple(iterable $values, null|int|\DateInterval $ttl = null): bool
    {
        $values = $this->fromIterable($values);
        foreach ($values as $key=>$value) {
            $this->set($key,$value,$ttl);
        }
        return true;
    }

    /**
     * @inheritDoc
     */
    public function deleteMultiple(iterable $keys): bool
    {
        $keys = $this->fromIterable($keys);
        $this->validateKeys($keys);
        $this->cache = array_filter($this->cache,static function($value,$key) use($keys) {
            $key = (string) $key;
            return !in_array($key,$keys,true);
        },ARRAY_FILTER_USE_BOTH);
        return  true;
    }
    private function normalizeTtl(null|int|string|\DateInterval $ttl): int
    {
        if($ttl ===null) {
            return  self::TTL_INFINITY;
        }

        if($ttl instanceof \DateInterval) {
            return (new \DateTime('@0'))->add($ttl)->getTimestamp();
        }
        return ((int) $ttl) > 0 ? $ttl : -1 ;
    }
    /**
     * @inheritDoc
     */
    public function has(string $key): bool
    {
        return array_key_exists($key,$this->cache);
    }
    private function fromIterable($iterable) :array
    {
        return $iterable instanceof  \Traversable ? iterator_to_array($iterable): (array) $iterable;
    }

    /**
     * @param string $key
     * @return void
     * @throws \Wispoz\ArrayCache\InvalidArgumentException
     */
    private function validateKey(string $key):void
    {
        if($key === '' || strpbrk($key,'/\@:{}[]')) {
            throw new \Wispoz\ArrayCache\InvalidArgumentException();
        }

    }

    /**
     * @param array $keys
     * @return void
     * @throws \Wispoz\ArrayCache\InvalidArgumentException
     */
    private function validateKeys(array $keys): void
    {
        foreach ($keys as $key) {
            $this->validateKey($key);
        }
    }
}

What is the expected result?

Test failed

What do you get instead?

All test passed

Additional info

The issue provides no repository file or test name; begin by locating the cache implementation and existing tests for TTL behavior. Reproduce the reported case with a positive TTL and verify that an expired entry is treated as missing, then run the relevant test suite.