In your application

In your application you'll use most of the time the Adapter::mount() adapter but in your tests writing to the filesystem can be slow. Instead you can use the Adapter::inMemory() one.

use Innmind\Filesystem\Adapter;

$filesystem = Adapter::inMemory();
// use $filesystem as usual

This adapter is tested against the same properties as Adapter::mount() to make sure there is no divergence of behaviour between the two.