code: func Exists(t TestReporter, path string) bool {
  	exists, err := afero.Exists(appFs, path)
  	if err != nil {
  		t.Error("Something went wrong when checking if "+path+"exists!", err)
  	}
  	return exists
  }
docs: /*
  Exists returns true if the file exists. Calls t.Error if something goes wrong while
  checking.
  */