testCases := []struct {
		name         string
		counterName  string
		handler      *fakeHandler
		err          error
		netlinkCalls int
	}{
		{
			name:        "valid",
			counterName: "metric-1",
			handler:     &fakeHandler{},
			// expected calls: NFNL_MSG_ACCT_NEW
			netlinkCalls: 1,
		},
		{
			name:        "add duplicate counter",
			counterName: "metric-2",
			handler: &fakeHandler{