public function testGetOldPaths()
 {
     $this->assertEmpty($this->storage->getOldPaths());
     $this->storage->setPath('foo');
     $this->assertEmpty($this->storage->getOldPaths());
     $this->storage->setPath('bar');
     $this->assertEquals(['foo'], $this->storage->getOldPaths());
     $this->storage->setPath('baz');
     $this->assertEquals(['foo', 'bar'], $this->storage->getOldPaths());
 }