public function observableFilesystemManagerProvider()
{
$prophecy1 = $this->prophesize(Filesystem::class);
$prophecy2 = $this->prophesize(Filesystem::class);
$fs1 = $prophecy1->reveal();
$fs2 = $prophecy2->reveal();
return [[$this->createFilesystemManager(['fs1' => $fs1, 'fs2' => $fs2]), $prophecy1, $prophecy2]];
}