How to get input from another reader (or *file) instead of os.Stdin?

[Prnyself]

I want to test my code and inject the input from another file for mocking input in os.Stdin, and I tried to replace os.Stdin with a tempfile or use survey.WithStdio to inject the tempfile, but neither worked. Looks like this buffer turned into all-zero-bytes-slice, so that rr.ReadRune() cannot read rune from stdio.In and just return an EOF error. So how can I get input from another file?

[viniciusramosdefaria]

We are facing the same problem, seems like when trying to read runes something unexpected happened. @Prnyself this problem was solved with a turnaround implementation?

[Prnyself]

We are facing the same problem, seems like when trying to read runes something unexpected happened. @Prnyself this problem was solved with a turnaround implementation?

Still not figure out. sigh

[viniciusramosdefaria]

@Prnyself i figured it out. The following snippet may help you:

func terminalRunner() {
    bufOut := new(bytes.Buffer)
    c, err := expect.NewConsole(expect.WithStdout(bufOut))
    if err != nil {
        fmt.Println(err)
    }
    defer c.Close()

    cmd := exec.Command("rit", "scaffold", "generate", "coffee-go")

    cmd.Stdin = c.Tty()
    cmd.Stdout = c.Tty()

    go func() {
        c.ExpectEOF()
    }()

    testCases := []testCase{
        {input: "test", expectOut: ".*Type your name.*"},
        {input: "es", expectOut: ".*Pick your coffee.*"},
        {input: "", expectOut: ".*Delivery.*"},
    }

    go func() {
        for i := 0; i < len(testCases); i++ {
            for {
                matched, _ := regexp.MatchString(testCases[i].expectOut, bufOut.String())
                if matched {
                    c.SendLine(testCases[i].input)
                    break
                }
                time.Sleep(1 * time.Second)
            }
        }
    }()

    cmd.Start()
    cmd.Wait()

    fmt.Println(bufOut.String())
}

[Prnyself]

cool, that looks similar with input manually. By the way, the package expect indicates go-expect ?

[viniciusramosdefaria]

Yes, it is. Ops, I missed the import section, here it goes:

import (
    "bytes"
    "fmt"
    "github.com/Netflix/go-expect"
    "os/exec"
    "regexp"
    "time"
)

[Prnyself]

Thank you for your help! Let's just leave this open, and see whether the maintainer would raise any native-project features for this.

[Prnyself]

I just found that tips about testing are already in Readme and I missed it. So anyone has the same issue about testing, just try to use go-expect with virtual terminal as mentioned :).