code: func DirExistsf(t TestingT, path string, msg string, args ...interface{}) bool {
  	if h, ok := t.(tHelper); ok {
  		h.Helper()
  	}
  	return DirExists(t, path, append([]interface{}{msg}, args...)...)
  }
docs: // DirExistsf checks whether a directory exists in the given path. It also fails if the path is a file rather a directory or there is an error checking whether it exists.