qmk-rgb/cmd/qmk-rgb-tool/main_test.go

package main

import (
	"bytes"
	"errors"
	"testing"

	"github.com/spf13/cobra"
)

func TestRootCommandSuppressesCobraErrorAndUsage(t *testing.T) {
	cmd := newRootCommand()
	var output bytes.Buffer
	cmd.SetOut(&output)
	cmd.SetErr(&output)
	cmd.AddCommand(&cobra.Command{
		Use: "probe",
		RunE: func(*cobra.Command, []string) error {
			return errors.New("probe failed")
		},
	})
	cmd.SetArgs([]string{"probe"})

	err := cmd.Execute()
	if err == nil {
		t.Fatal("Execute() expected error, got nil")
	}
	if output.Len() != 0 {
		t.Errorf("Cobra output = %q, want no duplicate error or usage", output.String())
	}
}