found := sets.New[string]()
	for _, l := range ls {
		if found.Contains(l.Name) {
			t.Errorf("duplicate cluster name %v", l.Name)
		}
		found.Insert(l.Name)
		ValidateCluster(t, l)
	}
}

func ValidateCluster(t testing.TB, c *cluster.Cluster) {
	if err := c.Validate(); err != nil {
		t.Errorf("cluster %v is invalid: %v", c.Name, err)
	}
	validateClusterTLS(t, c)
}