Go - Capture Stdout from your tests

capture_stdout.go

func startCapturingStdout() {

	// capture things from stdout
	suite.Old = os.Stdout // keep backup of the real stdout
	r, w, _ := os.Pipe()
	suite.R = r
	suite.W = w
	os.Stdout = suite.W

	suite.OutC = make(chan string)
	// copy the output in a separate goroutine so printing can't block indefinitely
	go func() {
		var buf bytes.Buffer
		io.Copy(&buf, r)
		suite.OutC <- buf.String()
	}()
}

func stopCapturingStdout() string {

	// bring thigns back to normal with stdout
	suite.W.Close()
	os.Stdout = suite.Old // restoring the real stdout
	out := <-suite.OutC
	return out
}

func main() {
 
  startCapturingStdout();
  
  fmt.Println("Hello World!")
  
  captured := stopCapturingStdout()
  
  fmt.Println(captured) // will print out "Hello World!"
  
}