gexpect collect

testgexpect.go

package main

import (
	"fmt"

	"github.com/steveeJ/gexpect"
)

func main() {
	hey := "testoutput"

	child, err := gexpect.Command(hey)
	if err != nil {
		panic(err)
	}
	if err := child.Start(); err != nil {
		panic(err)
	}

	child.Capture()

	if err := child.Wait(); err != nil {
		fmt.Println(err)
	}

	// If uncomment this line, then I can see "print stdout something", but not "print stderr something".
	//if err := child.Expect("print stdout"); err != nil {
	//	fmt.Println(err)
	//}

	// If uncomment this line, then I can see both lines.
	//if err := child.Expect("print stderr"); err != nil {
	//	fmt.Println(err)
	//}
	fmt.Println("child collect result:", string(child.Collect()))
}

testoutput.go

package main

import (
	"fmt"
	"os"
)

func main() {
	fmt.Println("print stdout something")
	fmt.Fprintln(os.Stderr, "print stderr something")
}