func IsValidIPv4Address(fldPath *field.Path, value string) field.ErrorList {
	var allErrors field.ErrorList
	ip := netutils.ParseIPSloppy(value)
	if ip == nil || ip.To4() == nil {
		allErrors = append(allErrors, field.Invalid(fldPath, value, "must be a valid IPv4 address"))
	}
	return allErrors
}

// IsValidIPv6Address tests that the argument is a valid IPv6 address.

				},
			},
		},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			if got := c.instance.Validate(); (got == nil) != c.valid {
				t.Fatalf("%s failed: got valid=%v but wanted valid=%v: %v", c.name, got == nil, c.valid, got)
			}
		})
	}
}

func TestServiceValidate(t *testing.T) {
	ports := PortList{
		{Name: "http", Port: 80, Protocol: protocol.HTTP},

	return &storage.VolumeAttachment{
		ObjectMeta: metav1.ObjectMeta{
			Name: name,
		},
		Spec: storage.VolumeAttachmentSpec{
			Attacher: "valid-attacher",
			Source: storage.VolumeAttachmentSource{
				PersistentVolumeName: &name,
			},
			NodeName: "valid-node",
		},
	}
}

func getValidVolumeAttachmentWithInlineSpec(name string) *storage.VolumeAttachment {
	volumeAttachment := getValidVolumeAttachment(name)

			RoleRef:    rbac.RoleRef{APIGroup: rbac.GroupName, Kind: "ClusterRole", Name: "valid"},
			Subjects: []rbac.Subject{
				{Name: "validsaname", APIGroup: "", Namespace: "foo", Kind: rbac.ServiceAccountKind},
				{Name: "valid@username", APIGroup: rbac.GroupName, Kind: rbac.UserKind},
				{Name: "valid@groupname", APIGroup: rbac.GroupName, Kind: rbac.GroupKind},
			},
		},
	)
	if len(errs) != 0 {

		isValid    bool
	}{
		{
			name:       "valid",
			newHistory: valid,
			oldHistory: valid,
			isValid:    true,
		},
		{
			name:       "changed data",
			newHistory: changedData,
			oldHistory: valid,
			isValid:    false,
		},
		{
			name:       "changed revision",
			newHistory: changedRevision,
			oldHistory: valid,
			isValid:    true,
		},
	}

		{"9.3.4.0 is valid since >= 6.0", "9.3.4.0", true},
		{"not a valid semantic version", "total junk", false},
	}

	for _, testCase := range testCases {
		t.Run(testCase.name, func(t *testing.T) {
			valid := checkMinVersion(testCase.vstring)
			if testCase.valid != valid {
				t.Errorf("Expected result: %v, Got result: %v", testCase.valid, valid)
			}
		})
	}
}

const testIPSetVersion = "v6.19"

			addresses: []string{},
		},
		"valid 1": {
			addresses: []string{"127.0.0.0/8"},
		},
		"valid 2": {
			addresses: []string{"0.0.0.0/0"},
		},
		"valid 3": {
			addresses: []string{"::/0"},
		},
		"valid 4": {
			addresses: []string{"127.0.0.1/32", "1.2.3.0/24"},
		},
		"valid 5": {
			addresses: []string{"127.0.0.1/32"},
		},
		"valid 6": {
			addresses: []string{"::1/128"},
		},

				strings.Join([]string{
					// generating a valid credential.
					generateCredentialStr(
						"access key",
						sampleTimeStr,
						"us-west-1",
						"s3",
						"aws4_request"),
					// valid SignedHeader.
					"SignedHeaders=host;x-amz-content-sha256;x-amz-date",
					// valid Signature field.
					// a valid signature is of form "Signature="
					"Signature=abcd",
				}, ","),

		cfgPath         string
		expectedError   bool
	}{
		{
			name:            "valid: run diff with empty config path on valid manifest path",
			cfgPath:         "",
			setManifestPath: true,
			manifestPath:    testUpgradeDiffManifest,
			expectedError:   false,
		},
		{
			name:            "valid: run diff on valid manifest path",
			cfgPath:         testUpgradeDiffConfig,
			setManifestPath: true,

        fails "tasks"

        and:
        failure.assertHasCause("Failed to apply plugin class 'MyPlugin'")
        failure.assertHasCause('''Type MyPlugin.Rules is not a valid rule source:
- Method strings() is not a valid rule method: The declared model element path ' ' is not a valid path: Model element name ' ' has illegal first character ' ' (names must start with an ASCII letter or underscore).''')
    }

    def "model name can be at nested path"() {