code: func HasHubConnectivity(t *testing.T) bool {
  	t.Helper()
  	// Set a timeout on the GET at 15s
  	var timeout = 15 * time.Second
  	var url = "https://hub.docker.com"
  
  	client := http.Client{Timeout: timeout}
  	resp, err := client.Get(url)
  	if err != nil && strings.Contains(err.Error(), "use of closed network connection") {
  		t.Fatalf("Timeout for GET request on %s", url)
  	}
  	if resp != nil {
  		resp.Body.Close()
  	}
  	return err == nil
  }
docs: // HasHubConnectivity checks to see if https://hub.docker.com is
  // accessible from the present environment