42 lines
688 B
Go
42 lines
688 B
Go
package testutil
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import (
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"bytes"
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"io"
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"log"
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"os"
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"sync"
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)
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// CaptureStdout is a helper function to capture stdout.
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func CaptureStdout(f func()) (string, error) {
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reader, writer, err := os.Pipe()
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if err != nil {
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return "", err
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}
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stdout := os.Stdout
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defer func() {
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os.Stdout = stdout
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log.SetOutput(os.Stderr)
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}()
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os.Stdout = writer
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log.SetOutput(writer)
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out := make(chan string, 1)
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wg := new(sync.WaitGroup)
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wg.Add(1)
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var ioCopyErr error
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go func() {
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var buf bytes.Buffer
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defer wg.Done()
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_, ioCopyErr = io.Copy(&buf, reader)
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out <- buf.String()
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}()
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f()
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_ = writer.Close()
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wg.Wait()
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if ioCopyErr != nil {
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return "", ioCopyErr
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}
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return <-out, nil
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}
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