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err = pool.Retry(func() error {
  SMTP_PORT = resource.GetPort("1025/tcp")
  HTTP_PORT = resource.GetPort("8025/tcp")
  // ping to ensure that the server is up and running
  _, err := net.Dial("tcp", net.JoinHostPort("localhost", SMTP_PORT))
  return err
})

if err != nil {
  log.Fatalf("Could not connect to database: %s", err)

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code := m.Run()

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if err := pool.Purge(resource); err != nil {
  log.Fatalf("Could not purge resource: %s", err)
}

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os.Exit(code)

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func TestMain(m *testing.M) {
	// uses a sensible default on windows (tcp/http) and linux/osx (socket)
	pool, err := dockertest.NewPool("")
	if err != nil {
		log.Fatalf("Could not connect to docker: %s", err)
	}

	// we will use a dockerfile to build the image for testing
	resource, err := pool.BuildAndRun("mailhog-test-server", "./Dockerfile", []string{})
	if err != nil {

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mail := Mail{
  host:     SMTP_HOST,
  port:     SMTP_PORT,
  from:     "from@example.com",
  password: "",
  username: "",
}

err := mail.Send([]string{"to@example.com"}, "Test Subject", "Sending an automated test email")
assert.Nil(t, err)

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resp, err := http.Get(fmt.Sprintf("http://localhost:%s/api/v2/messages", HTTP_PORT))

assert.Nil(t, err)

defer resp.Body.Close()

assert.Equal(t, 200, resp.StatusCode)

body, err := ioutil.ReadAll(resp.Body)

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// hard kill the container in 3 minutes (180 Seconds) 
resource.Expire(180)

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viper.SetConfigFile("./path/to/config-file.yaml")
viper.SetConfigFile("./path/to/config-file-2.json")

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viper.AddConfigPath(".")
viper.AddConfigPath("$HOME/.looped")