TopologyKey:       "k8s.io/zone",
			LabelSelector:     &metav1.LabelSelector{},
			WhenUnsatisfiable: core.DoNotSchedule,
			MatchLabelKeys:    []string{"/simple"},
		}},
		wantFieldErrors: field.ErrorList{field.Invalid(fieldPathMatchLabelKeys.Index(0), "/simple", "prefix part must be non-empty")},
	}, {
		name: "key exists in both matchLabelKeys and labelSelector",
		constraints: []core.TopologySpreadConstraint{{

the incoming pod labels, those key-value labels are ANDed with labelSelector to select the group of existing pods over which spreading will be calculated for the incoming pod. The same key is forbidden to exist in both MatchLabelKeys and LabelSelector. MatchLabelKeys cannot be set when LabelSelector isn't set. Keys that don't exist in the incoming pod labels will be ignored. A null or empty list means only match against labelSelector.\n\nThis is a beta field and requires the MatchLabelKeysInPodTopologySpread...

            }
          },
          {
            "description": "A selector to restrict the list of returned objects by their labels. Defaults to everything.",
            "in": "query",
            "name": "labelSelector",
            "schema": {
              "type": "string",
              "uniqueItems": true
            }
          },
          {