CaptureLogs.go

var logLines []string

type logMock struct{}

func (l *logMock) Write(p []byte) (int, error) {
	logLines = append(logLines, string(p))
	return 0, nil
}

//CaptureLogOutput A utility to capture the log output of a function and pass it along
func CaptureLogOutput(toBeCaptured func(), handleResults func([]string)) {
	logLines = []string{}
	currentFlags := log.Flags()
	log.SetFlags(0)
	log.SetOutput(&logMock{})
	toBeCaptured()
	log.SetOutput(os.Stderr)
	log.SetFlags(currentFlags)
	handleResults(logLines)
}

Great idea, all ideas implemented: https://github.com/MediaMath/auth_go_common_libs

See for examples: https://github.com/MediaMath/auth_go_common_libs/blob/master/testhelpers/testhelpers_test.go