[6.x] Flakey memcached tests

[GrahamCampbell]

• Laravel Version: 5.8+
• PHP Version: 7
• Database Driver & Version: N/A

Description:

I see this every few days within the travis builds:

There were 2 failures:

1) Illuminate\Tests\Integration\Cache\MemcachedTaggedCacheTest::test_memcached_can_store_and_retrieve_tagged_cache_items

Failed asserting that null matches expected 'foo'.

/home/travis/build/laravel/framework/tests/Integration/Cache/MemcachedTaggedCacheTest.php:19

2) Illuminate\Tests\Integration\Cache\MemcachedTaggedCacheTest::test_memcached_can_store_many_tagged_cache_items

Failed asserting that null matches expected 'foo'.

/home/travis/build/laravel/framework/tests/Integration/Cache/MemcachedTaggedCacheTest.php:41

[driesvints]

Yeah we need to get that fixed. I've seen that sporadically happen as well.

[driesvints]

Going on a limb here and assume this is fixed in Github Actions. If we see it pop back up we can reopen.

[GrahamCampbell]

This is still happening, even on GitHub actions. The last build of master just failed:

[ryangjchandler]

Is it possible that the TTL of 1 second isn't actually enough sometimes and when the assertion is run, the cache has actually expired?

[driesvints]

@ryangjchandler that can indeed be it. Sending in a pr.

[ryangjchandler]

@ryangjchandler that can indeed be it. Sending in a pr.

🤞🏼. If not, then I'll have to take another look but that's the only reason I can see null being returned.