Function captureStderr

internal/cli/cli_helpers_test.go:46–67

captureStderr replaces os.Stderr for the duration of fn and returns what was written.

(t *testing.T, fn func())

// captureStderr replaces os.Stderr for the duration of fn and returns what was written.
func captureStderr(t *testing.T, fn func()) string {
	t.Helper()

	r, w, err := os.Pipe()
	if err != nil {
		t.Fatalf("os.Pipe: %v", err)
	}

	old := os.Stderr
	os.Stderr = w

	fn()

	_ = w.Close()
	os.Stderr = old

	var buf bytes.Buffer

	_, _ = io.Copy(&buf, r)

	return buf.String()
}

func TestPrintJSON(t *testing.T) {
	type payload struct {