code: func CleanUp(t TestReporter) {
  	for _, path := range Files {
  		if err := appFs.RemoveAll(path); err != nil {
  			t.Error(appFs.Name(), err)
  		}
  	}
  
  	Files = make([]string, 0)
  }
docs: /*
  CleanUp removes all files in our test registry and calls `t.Error` if something goes
  wrong.
  */