/*
Copyright 2018 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package nodestatus

import (
	"fmt"
	"net"
	"sort"
	"strconv"
	"testing"
	"time"

	cadvisorapiv1 "github.com/google/cadvisor/info/v1"

	"k8s.io/api/core/v1"
	apiequality "k8s.io/apimachinery/pkg/api/equality"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/diff"
	"k8s.io/apimachinery/pkg/util/rand"
	"k8s.io/apimachinery/pkg/util/uuid"
	fakecloud "k8s.io/kubernetes/pkg/cloudprovider/providers/fake"
	"k8s.io/kubernetes/pkg/kubelet/cm"
	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
	kubecontainertest "k8s.io/kubernetes/pkg/kubelet/container/testing"
	"k8s.io/kubernetes/pkg/kubelet/events"
	"k8s.io/kubernetes/pkg/kubelet/util/sliceutils"
	"k8s.io/kubernetes/pkg/version"
	"k8s.io/kubernetes/pkg/volume"
	volumetest "k8s.io/kubernetes/pkg/volume/testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

const (
	testKubeletHostname = "127.0.0.1"
)

// TODO(mtaufen): below is ported from the old kubelet_node_status_test.go code, potentially add more test coverage for NodeAddress setter in future
func TestNodeAddress(t *testing.T) {
	cases := []struct {
		name              string
		hostnameOverride  bool
		nodeIP            net.IP
		nodeAddresses     []v1.NodeAddress
		expectedAddresses []v1.NodeAddress
		shouldError       bool
	}{
		{
			name:   "A single InternalIP",
			nodeIP: net.ParseIP("10.1.1.1"),
			nodeAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeHostName, Address: testKubeletHostname},
			},
			expectedAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeHostName, Address: testKubeletHostname},
			},
			shouldError: false,
		},
		{
			name:   "NodeIP is external",
			nodeIP: net.ParseIP("55.55.55.55"),
			nodeAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeHostName, Address: testKubeletHostname},
			},
			expectedAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeHostName, Address: testKubeletHostname},
			},
			shouldError: false,
		},
		{
			// Accommodating #45201 and #49202
			name:   "InternalIP and ExternalIP are the same",
			nodeIP: net.ParseIP("55.55.55.55"),
			nodeAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeHostName, Address: testKubeletHostname},
			},
			expectedAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeHostName, Address: testKubeletHostname},
			},
			shouldError: false,
		},
		{
			name:   "An Internal/ExternalIP, an Internal/ExternalDNS",
			nodeIP: net.ParseIP("10.1.1.1"),
			nodeAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeInternalDNS, Address: "ip-10-1-1-1.us-west-2.compute.internal"},
				{Type: v1.NodeExternalDNS, Address: "ec2-55-55-55-55.us-west-2.compute.amazonaws.com"},
				{Type: v1.NodeHostName, Address: testKubeletHostname},
			},
			expectedAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeInternalDNS, Address: "ip-10-1-1-1.us-west-2.compute.internal"},
				{Type: v1.NodeExternalDNS, Address: "ec2-55-55-55-55.us-west-2.compute.amazonaws.com"},
				{Type: v1.NodeHostName, Address: testKubeletHostname},
			},
			shouldError: false,
		},
		{
			name:   "An Internal with multiple internal IPs",
			nodeIP: net.ParseIP("10.1.1.1"),
			nodeAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeInternalIP, Address: "10.2.2.2"},
				{Type: v1.NodeInternalIP, Address: "10.3.3.3"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeHostName, Address: testKubeletHostname},
			},
			expectedAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeHostName, Address: testKubeletHostname},
			},
			shouldError: false,
		},
		{
			name:   "An InternalIP that isn't valid: should error",
			nodeIP: net.ParseIP("10.2.2.2"),
			nodeAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeHostName, Address: testKubeletHostname},
			},
			expectedAddresses: nil,
			shouldError:       true,
		},
		{
			name:          "no cloud reported hostnames",
			nodeAddresses: []v1.NodeAddress{},
			expectedAddresses: []v1.NodeAddress{
				{Type: v1.NodeHostName, Address: testKubeletHostname}, // detected hostname is auto-added in the absence of cloud-reported hostnames
			},
			shouldError: false,
		},
		{
			name: "cloud reports hostname, no override",
			nodeAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeHostName, Address: "cloud-host"},
			},
			expectedAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeHostName, Address: "cloud-host"}, // cloud-reported hostname wins over detected hostname
			},
			shouldError: false,
		},
		{
			name: "cloud reports hostname, overridden",
			nodeAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeHostName, Address: "cloud-host"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
			},
			expectedAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeHostName, Address: testKubeletHostname}, // hostname-override wins over cloud-reported hostname
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
			},
			hostnameOverride: true,
			shouldError:      false,
		},
		{
			name: "cloud doesn't report hostname, no override, detected hostname mismatch",
			nodeAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
			},
			expectedAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				// detected hostname is not auto-added if it doesn't match any cloud-reported addresses
			},
			shouldError: false,
		},
		{
			name: "cloud doesn't report hostname, no override, detected hostname match",
			nodeAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeExternalDNS, Address: testKubeletHostname}, // cloud-reported address value matches detected hostname
			},
			expectedAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeExternalDNS, Address: testKubeletHostname},
				{Type: v1.NodeHostName, Address: testKubeletHostname}, // detected hostname gets auto-added
			},
			shouldError: false,
		},
		{
			name: "cloud doesn't report hostname, hostname override, hostname mismatch",
			nodeAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
			},
			expectedAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},
				{Type: v1.NodeExternalIP, Address: "55.55.55.55"},
				{Type: v1.NodeHostName, Address: testKubeletHostname}, // overridden hostname gets auto-added
			},
			hostnameOverride: true,
			shouldError:      false,
		},
	}
	for _, testCase := range cases {
		t.Run(testCase.name, func(t *testing.T) {
			// testCase setup
			existingNode := &v1.Node{
				ObjectMeta: metav1.ObjectMeta{Name: testKubeletHostname, Annotations: make(map[string]string)},
				Spec:       v1.NodeSpec{},
			}

			nodeIP := testCase.nodeIP
			nodeIPValidator := func(nodeIP net.IP) error {
				return nil
			}
			hostname := testKubeletHostname
			externalCloudProvider := false
			cloud := &fakecloud.FakeCloud{
				Addresses: testCase.nodeAddresses,
				Err:       nil,
			}
			nodeAddressesFunc := func() ([]v1.NodeAddress, error) {
				return testCase.nodeAddresses, nil
			}

			// construct setter
			setter := NodeAddress(nodeIP,
				nodeIPValidator,
				hostname,
				testCase.hostnameOverride,
				externalCloudProvider,
				cloud,
				nodeAddressesFunc)

			// call setter on existing node
			err := setter(existingNode)
			if err != nil && !testCase.shouldError {
				t.Fatalf("unexpected error: %v", err)
			} else if err != nil && testCase.shouldError {
				// expected an error, and got one, so just return early here
				return
			}

			// Sort both sets for consistent equality
			sortNodeAddresses(testCase.expectedAddresses)
			sortNodeAddresses(existingNode.Status.Addresses)

			assert.True(t, apiequality.Semantic.DeepEqual(testCase.expectedAddresses, existingNode.Status.Addresses),
				"Diff: %s", diff.ObjectDiff(testCase.expectedAddresses, existingNode.Status.Addresses))
		})
	}
}

func TestMachineInfo(t *testing.T) {
	const nodeName = "test-node"

	type dprc struct {
		capacity    v1.ResourceList
		allocatable v1.ResourceList
		inactive    []string
	}

	cases := []struct {
		desc                         string
		node                         *v1.Node
		maxPods                      int
		podsPerCore                  int
		machineInfo                  *cadvisorapiv1.MachineInfo
		machineInfoError             error
		capacity                     v1.ResourceList
		devicePluginResourceCapacity dprc
		nodeAllocatableReservation   v1.ResourceList
		expectNode                   *v1.Node
		expectEvents                 []testEvent
	}{
		{
			desc:    "machine identifiers, basic capacity and allocatable",
			node:    &v1.Node{},
			maxPods: 110,
			machineInfo: &cadvisorapiv1.MachineInfo{
				MachineID:      "MachineID",
				SystemUUID:     "SystemUUID",
				NumCores:       2,
				MemoryCapacity: 1024,
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					NodeInfo: v1.NodeSystemInfo{
						MachineID:  "MachineID",
						SystemUUID: "SystemUUID",
					},
					Capacity: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
					},
				},
			},
		},
		{
			desc:        "podsPerCore greater than zero, but less than maxPods/cores",
			node:        &v1.Node{},
			maxPods:     10,
			podsPerCore: 4,
			machineInfo: &cadvisorapiv1.MachineInfo{
				NumCores:       2,
				MemoryCapacity: 1024,
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(8, resource.DecimalSI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(8, resource.DecimalSI),
					},
				},
			},
		},
		{
			desc:        "podsPerCore greater than maxPods/cores",
			node:        &v1.Node{},
			maxPods:     10,
			podsPerCore: 6,
			machineInfo: &cadvisorapiv1.MachineInfo{
				NumCores:       2,
				MemoryCapacity: 1024,
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(10, resource.DecimalSI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(10, resource.DecimalSI),
					},
				},
			},
		},
		{
			desc:    "allocatable should equal capacity minus reservations",
			node:    &v1.Node{},
			maxPods: 110,
			machineInfo: &cadvisorapiv1.MachineInfo{
				NumCores:       2,
				MemoryCapacity: 1024,
			},
			nodeAllocatableReservation: v1.ResourceList{
				// reserve 1 unit for each resource
				v1.ResourceCPU:              *resource.NewMilliQuantity(1, resource.DecimalSI),
				v1.ResourceMemory:           *resource.NewQuantity(1, resource.BinarySI),
				v1.ResourcePods:             *resource.NewQuantity(1, resource.DecimalSI),
				v1.ResourceEphemeralStorage: *resource.NewQuantity(1, resource.BinarySI),
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(1999, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1023, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(109, resource.DecimalSI),
					},
				},
			},
		},
		{
			desc: "allocatable memory does not double-count hugepages reservations",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						// it's impossible on any real system to reserve 1 byte,
						// but we just need to test that the setter does the math
						v1.ResourceHugePagesPrefix + "test": *resource.NewQuantity(1, resource.BinarySI),
					},
				},
			},
			maxPods: 110,
			machineInfo: &cadvisorapiv1.MachineInfo{
				NumCores:       2,
				MemoryCapacity: 1024,
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						v1.ResourceCPU:                      *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory:                   *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourceHugePagesPrefix + "test": *resource.NewQuantity(1, resource.BinarySI),
						v1.ResourcePods:                     *resource.NewQuantity(110, resource.DecimalSI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU: *resource.NewMilliQuantity(2000, resource.DecimalSI),
						// memory has 1-unit difference for hugepages reservation
						v1.ResourceMemory:                   *resource.NewQuantity(1023, resource.BinarySI),
						v1.ResourceHugePagesPrefix + "test": *resource.NewQuantity(1, resource.BinarySI),
						v1.ResourcePods:                     *resource.NewQuantity(110, resource.DecimalSI),
					},
				},
			},
		},
		{
			desc: "negative capacity resources should be set to 0 in allocatable",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						"negative-resource": *resource.NewQuantity(-1, resource.BinarySI),
					},
				},
			},
			maxPods: 110,
			machineInfo: &cadvisorapiv1.MachineInfo{
				NumCores:       2,
				MemoryCapacity: 1024,
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						v1.ResourceCPU:      *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory:   *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:     *resource.NewQuantity(110, resource.DecimalSI),
						"negative-resource": *resource.NewQuantity(-1, resource.BinarySI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU:      *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory:   *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:     *resource.NewQuantity(110, resource.DecimalSI),
						"negative-resource": *resource.NewQuantity(0, resource.BinarySI),
					},
				},
			},
		},
		{
			desc:    "ephemeral storage is reflected in capacity and allocatable",
			node:    &v1.Node{},
			maxPods: 110,
			machineInfo: &cadvisorapiv1.MachineInfo{
				NumCores:       2,
				MemoryCapacity: 1024,
			},
			capacity: v1.ResourceList{
				v1.ResourceEphemeralStorage: *resource.NewQuantity(5000, resource.BinarySI),
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						v1.ResourceCPU:              *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory:           *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:             *resource.NewQuantity(110, resource.DecimalSI),
						v1.ResourceEphemeralStorage: *resource.NewQuantity(5000, resource.BinarySI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU:              *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory:           *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:             *resource.NewQuantity(110, resource.DecimalSI),
						v1.ResourceEphemeralStorage: *resource.NewQuantity(5000, resource.BinarySI),
					},
				},
			},
		},
		{
			desc:    "device plugin resources are reflected in capacity and allocatable",
			node:    &v1.Node{},
			maxPods: 110,
			machineInfo: &cadvisorapiv1.MachineInfo{
				NumCores:       2,
				MemoryCapacity: 1024,
			},
			devicePluginResourceCapacity: dprc{
				capacity: v1.ResourceList{
					"device-plugin": *resource.NewQuantity(1, resource.BinarySI),
				},
				allocatable: v1.ResourceList{
					"device-plugin": *resource.NewQuantity(1, resource.BinarySI),
				},
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
						"device-plugin":   *resource.NewQuantity(1, resource.BinarySI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
						"device-plugin":   *resource.NewQuantity(1, resource.BinarySI),
					},
				},
			},
		},
		{
			desc: "inactive device plugin resources should have their capacity set to 0",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						"inactive": *resource.NewQuantity(1, resource.BinarySI),
					},
				},
			},
			maxPods: 110,
			machineInfo: &cadvisorapiv1.MachineInfo{
				NumCores:       2,
				MemoryCapacity: 1024,
			},
			devicePluginResourceCapacity: dprc{
				inactive: []string{"inactive"},
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
						"inactive":        *resource.NewQuantity(0, resource.BinarySI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
						"inactive":        *resource.NewQuantity(0, resource.BinarySI),
					},
				},
			},
		},
		{
			desc: "extended resources not present in capacity are removed from allocatable",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Allocatable: v1.ResourceList{
						"example.com/extended": *resource.NewQuantity(1, resource.BinarySI),
					},
				},
			},
			maxPods: 110,
			machineInfo: &cadvisorapiv1.MachineInfo{
				NumCores:       2,
				MemoryCapacity: 1024,
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
					},
				},
			},
		},
		{
			desc:    "on failure to get machine info, allocatable and capacity for memory and cpu are set to 0, pods to maxPods",
			node:    &v1.Node{},
			maxPods: 110,
			// podsPerCore is not accounted for when getting machine info fails
			podsPerCore:      1,
			machineInfoError: fmt.Errorf("foo"),
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(0, resource.DecimalSI),
						v1.ResourceMemory: resource.MustParse("0Gi"),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(0, resource.DecimalSI),
						v1.ResourceMemory: resource.MustParse("0Gi"),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
					},
				},
			},
		},
		{
			desc: "node reboot event is recorded",
			node: &v1.Node{
				Status: v1.NodeStatus{
					NodeInfo: v1.NodeSystemInfo{
						BootID: "foo",
					},
				},
			},
			maxPods: 110,
			machineInfo: &cadvisorapiv1.MachineInfo{
				BootID:         "bar",
				NumCores:       2,
				MemoryCapacity: 1024,
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					NodeInfo: v1.NodeSystemInfo{
						BootID: "bar",
					},
					Capacity: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU:    *resource.NewMilliQuantity(2000, resource.DecimalSI),
						v1.ResourceMemory: *resource.NewQuantity(1024, resource.BinarySI),
						v1.ResourcePods:   *resource.NewQuantity(110, resource.DecimalSI),
					},
				},
			},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeWarning,
					event:     events.NodeRebooted,
					message:   fmt.Sprintf("Node %s has been rebooted, boot id: %s", nodeName, "bar"),
				},
			},
		},
	}

	for _, tc := range cases {
		t.Run(tc.desc, func(t *testing.T) {
			machineInfoFunc := func() (*cadvisorapiv1.MachineInfo, error) {
				return tc.machineInfo, tc.machineInfoError
			}
			capacityFunc := func() v1.ResourceList {
				return tc.capacity
			}
			devicePluginResourceCapacityFunc := func() (v1.ResourceList, v1.ResourceList, []string) {
				c := tc.devicePluginResourceCapacity
				return c.capacity, c.allocatable, c.inactive
			}
			nodeAllocatableReservationFunc := func() v1.ResourceList {
				return tc.nodeAllocatableReservation
			}

			events := []testEvent{}
			recordEventFunc := func(eventType, event, message string) {
				events = append(events, testEvent{
					eventType: eventType,
					event:     event,
					message:   message,
				})
			}
			// construct setter
			setter := MachineInfo(nodeName, tc.maxPods, tc.podsPerCore, machineInfoFunc, capacityFunc,
				devicePluginResourceCapacityFunc, nodeAllocatableReservationFunc, recordEventFunc)
			// call setter on node
			if err := setter(tc.node); err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			// check expected node
			assert.True(t, apiequality.Semantic.DeepEqual(tc.expectNode, tc.node),
				"Diff: %s", diff.ObjectDiff(tc.expectNode, tc.node))
			// check expected events
			require.Equal(t, len(tc.expectEvents), len(events))
			for i := range tc.expectEvents {
				assert.Equal(t, tc.expectEvents[i], events[i])
			}
		})
	}

}

func TestVersionInfo(t *testing.T) {
	cases := []struct {
		desc                string
		node                *v1.Node
		versionInfo         *cadvisorapiv1.VersionInfo
		versionInfoError    error
		runtimeType         string
		runtimeVersion      kubecontainer.Version
		runtimeVersionError error
		expectNode          *v1.Node
		expectError         error
	}{
		{
			desc: "versions set in node info",
			node: &v1.Node{},
			versionInfo: &cadvisorapiv1.VersionInfo{
				KernelVersion:      "KernelVersion",
				ContainerOsVersion: "ContainerOSVersion",
			},
			runtimeType: "RuntimeType",
			runtimeVersion: &kubecontainertest.FakeVersion{
				Version: "RuntimeVersion",
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					NodeInfo: v1.NodeSystemInfo{
						KernelVersion:           "KernelVersion",
						OSImage:                 "ContainerOSVersion",
						ContainerRuntimeVersion: "RuntimeType://RuntimeVersion",
						KubeletVersion:          version.Get().String(),
						KubeProxyVersion:        version.Get().String(),
					},
				},
			},
		},
		{
			desc:             "error getting version info",
			node:             &v1.Node{},
			versionInfoError: fmt.Errorf("foo"),
			expectNode:       &v1.Node{},
			expectError:      fmt.Errorf("error getting version info: foo"),
		},
		{
			desc:                "error getting runtime version results in Unknown runtime",
			node:                &v1.Node{},
			versionInfo:         &cadvisorapiv1.VersionInfo{},
			runtimeType:         "RuntimeType",
			runtimeVersionError: fmt.Errorf("foo"),
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					NodeInfo: v1.NodeSystemInfo{
						ContainerRuntimeVersion: "RuntimeType://Unknown",
						KubeletVersion:          version.Get().String(),
						KubeProxyVersion:        version.Get().String(),
					},
				},
			},
		},
	}

	for _, tc := range cases {
		t.Run(tc.desc, func(t *testing.T) {
			versionInfoFunc := func() (*cadvisorapiv1.VersionInfo, error) {
				return tc.versionInfo, tc.versionInfoError
			}
			runtimeTypeFunc := func() string {
				return tc.runtimeType
			}
			runtimeVersionFunc := func() (kubecontainer.Version, error) {
				return tc.runtimeVersion, tc.runtimeVersionError
			}
			// construct setter
			setter := VersionInfo(versionInfoFunc, runtimeTypeFunc, runtimeVersionFunc)
			// call setter on node
			err := setter(tc.node)
			require.Equal(t, tc.expectError, err)
			// check expected node
			assert.True(t, apiequality.Semantic.DeepEqual(tc.expectNode, tc.node),
				"Diff: %s", diff.ObjectDiff(tc.expectNode, tc.node))
		})
	}
}

func TestImages(t *testing.T) {
	const (
		minImageSize = 23 * 1024 * 1024
		maxImageSize = 1000 * 1024 * 1024
	)

	cases := []struct {
		desc           string
		maxImages      int32
		imageList      []kubecontainer.Image
		imageListError error
		expectError    error
	}{
		{
			desc:      "max images enforced",
			maxImages: 1,
			imageList: makeImageList(2, 1, minImageSize, maxImageSize),
		},
		{
			desc:      "no max images cap for -1",
			maxImages: -1,
			imageList: makeImageList(2, 1, minImageSize, maxImageSize),
		},
		{
			desc:      "max names per image enforced",
			maxImages: -1,
			imageList: makeImageList(1, MaxNamesPerImageInNodeStatus+1, minImageSize, maxImageSize),
		},
		{
			desc:      "images are sorted by size, descending",
			maxImages: -1,
			// makeExpectedImageList will sort them for expectedNode when the test case is run
			imageList: []kubecontainer.Image{{Size: 3}, {Size: 1}, {Size: 4}, {Size: 2}},
		},
		{
			desc:      "repo digests and tags both show up in image names",
			maxImages: -1,
			// makeExpectedImageList will use both digests and tags
			imageList: []kubecontainer.Image{
				{
					RepoDigests: []string{"foo", "bar"},
					RepoTags:    []string{"baz", "quux"},
				},
			},
		},
		{
			desc:           "error getting image list, image list on node is reset to empty",
			maxImages:      -1,
			imageListError: fmt.Errorf("foo"),
			expectError:    fmt.Errorf("error getting image list: foo"),
		},
	}

	for _, tc := range cases {
		t.Run(tc.desc, func(t *testing.T) {
			imageListFunc := func() ([]kubecontainer.Image, error) {
				// today, imageListFunc is expected to return a sorted list,
				// but we may choose to sort in the setter at some future point
				// (e.g. if the image cache stopped sorting for us)
				sort.Sort(sliceutils.ByImageSize(tc.imageList))
				return tc.imageList, tc.imageListError
			}
			// construct setter
			setter := Images(tc.maxImages, imageListFunc)
			// call setter on node
			node := &v1.Node{}
			err := setter(node)
			require.Equal(t, tc.expectError, err)
			// check expected node, image list should be reset to empty when there is an error
			expectNode := &v1.Node{}
			if err == nil {
				expectNode.Status.Images = makeExpectedImageList(tc.imageList, tc.maxImages, MaxNamesPerImageInNodeStatus)
			}
			assert.True(t, apiequality.Semantic.DeepEqual(expectNode, node),
				"Diff: %s", diff.ObjectDiff(expectNode, node))
		})
	}

}

func TestReadyCondition(t *testing.T) {
	now := time.Now()
	before := now.Add(-time.Second)
	nowFunc := func() time.Time { return now }

	withCapacity := &v1.Node{
		Status: v1.NodeStatus{
			Capacity: v1.ResourceList{
				v1.ResourceCPU:              *resource.NewMilliQuantity(2000, resource.DecimalSI),
				v1.ResourceMemory:           *resource.NewQuantity(10E9, resource.BinarySI),
				v1.ResourcePods:             *resource.NewQuantity(100, resource.DecimalSI),
				v1.ResourceEphemeralStorage: *resource.NewQuantity(5000, resource.BinarySI),
			},
		},
	}

	cases := []struct {
		desc                     string
		node                     *v1.Node
		runtimeErrors            []string
		networkErrors            []string
		appArmorValidateHostFunc func() error
		cmStatus                 cm.Status
		expectConditions         []v1.NodeCondition
		expectEvents             []testEvent
	}{
		{
			desc:             "new, ready",
			node:             withCapacity.DeepCopy(),
			expectConditions: []v1.NodeCondition{*makeReadyCondition(true, "kubelet is posting ready status", now, now)},
			// TODO(mtaufen): The current behavior is that we don't send an event for the initial NodeReady condition,
			// the reason for this is unclear, so we may want to actually send an event, and change these test cases
			// to ensure an event is sent.
		},
		{
			desc: "new, ready: apparmor validator passed",
			node: withCapacity.DeepCopy(),
			appArmorValidateHostFunc: func() error { return nil },
			expectConditions:         []v1.NodeCondition{*makeReadyCondition(true, "kubelet is posting ready status. AppArmor enabled", now, now)},
		},
		{
			desc: "new, ready: apparmor validator failed",
			node: withCapacity.DeepCopy(),
			appArmorValidateHostFunc: func() error { return fmt.Errorf("foo") },
			// absence of an additional message is understood to mean that AppArmor is disabled
			expectConditions: []v1.NodeCondition{*makeReadyCondition(true, "kubelet is posting ready status", now, now)},
		},
		{
			desc: "new, ready: soft requirement warning",
			node: withCapacity.DeepCopy(),
			cmStatus: cm.Status{
				SoftRequirements: fmt.Errorf("foo"),
			},
			expectConditions: []v1.NodeCondition{*makeReadyCondition(true, "kubelet is posting ready status. WARNING: foo", now, now)},
		},
		{
			desc:             "new, not ready: runtime errors",
			node:             withCapacity.DeepCopy(),
			runtimeErrors:    []string{"foo", "bar"},
			expectConditions: []v1.NodeCondition{*makeReadyCondition(false, "foo,bar", now, now)},
		},
		{
			desc:             "new, not ready: network errors",
			node:             withCapacity.DeepCopy(),
			networkErrors:    []string{"foo", "bar"},
			expectConditions: []v1.NodeCondition{*makeReadyCondition(false, "foo,bar", now, now)},
		},
		{
			desc:             "new, not ready: runtime and network errors",
			node:             withCapacity.DeepCopy(),
			runtimeErrors:    []string{"runtime"},
			networkErrors:    []string{"network"},
			expectConditions: []v1.NodeCondition{*makeReadyCondition(false, "runtime,network", now, now)},
		},
		{
			desc:             "new, not ready: missing capacities",
			node:             &v1.Node{},
			expectConditions: []v1.NodeCondition{*makeReadyCondition(false, "Missing node capacity for resources: cpu, memory, pods, ephemeral-storage", now, now)},
		},
		// the transition tests ensure timestamps are set correctly, no need to test the entire condition matrix in this section
		{
			desc: "transition to ready",
			node: func() *v1.Node {
				node := withCapacity.DeepCopy()
				node.Status.Conditions = []v1.NodeCondition{*makeReadyCondition(false, "", before, before)}
				return node
			}(),
			expectConditions: []v1.NodeCondition{*makeReadyCondition(true, "kubelet is posting ready status", now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     events.NodeReady,
				},
			},
		},
		{
			desc: "transition to not ready",
			node: func() *v1.Node {
				node := withCapacity.DeepCopy()
				node.Status.Conditions = []v1.NodeCondition{*makeReadyCondition(true, "", before, before)}
				return node
			}(),
			runtimeErrors:    []string{"foo"},
			expectConditions: []v1.NodeCondition{*makeReadyCondition(false, "foo", now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     events.NodeNotReady,
				},
			},
		},
		{
			desc: "ready, no transition",
			node: func() *v1.Node {
				node := withCapacity.DeepCopy()
				node.Status.Conditions = []v1.NodeCondition{*makeReadyCondition(true, "", before, before)}
				return node
			}(),
			expectConditions: []v1.NodeCondition{*makeReadyCondition(true, "kubelet is posting ready status", before, now)},
			expectEvents:     []testEvent{},
		},
		{
			desc: "not ready, no transition",
			node: func() *v1.Node {
				node := withCapacity.DeepCopy()
				node.Status.Conditions = []v1.NodeCondition{*makeReadyCondition(false, "", before, before)}
				return node
			}(),
			runtimeErrors:    []string{"foo"},
			expectConditions: []v1.NodeCondition{*makeReadyCondition(false, "foo", before, now)},
			expectEvents:     []testEvent{},
		},
	}
	for _, tc := range cases {
		t.Run(tc.desc, func(t *testing.T) {
			runtimeErrorsFunc := func() []string {
				return tc.runtimeErrors
			}
			networkErrorsFunc := func() []string {
				return tc.networkErrors
			}
			cmStatusFunc := func() cm.Status {
				return tc.cmStatus
			}
			events := []testEvent{}
			recordEventFunc := func(eventType, event string) {
				events = append(events, testEvent{
					eventType: eventType,
					event:     event,
				})
			}
			// construct setter
			setter := ReadyCondition(nowFunc, runtimeErrorsFunc, networkErrorsFunc, tc.appArmorValidateHostFunc, cmStatusFunc, recordEventFunc)
			// call setter on node
			if err := setter(tc.node); err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			// check expected condition
			assert.True(t, apiequality.Semantic.DeepEqual(tc.expectConditions, tc.node.Status.Conditions),
				"Diff: %s", diff.ObjectDiff(tc.expectConditions, tc.node.Status.Conditions))
			// check expected events
			require.Equal(t, len(tc.expectEvents), len(events))
			for i := range tc.expectEvents {
				assert.Equal(t, tc.expectEvents[i], events[i])
			}
		})
	}
}

func TestMemoryPressureCondition(t *testing.T) {
	now := time.Now()
	before := now.Add(-time.Second)
	nowFunc := func() time.Time { return now }

	cases := []struct {
		desc             string
		node             *v1.Node
		pressure         bool
		expectConditions []v1.NodeCondition
		expectEvents     []testEvent
	}{
		{
			desc:             "new, no pressure",
			node:             &v1.Node{},
			pressure:         false,
			expectConditions: []v1.NodeCondition{*makeMemoryPressureCondition(false, now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     "NodeHasSufficientMemory",
				},
			},
		},
		{
			desc:             "new, pressure",
			node:             &v1.Node{},
			pressure:         true,
			expectConditions: []v1.NodeCondition{*makeMemoryPressureCondition(true, now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     "NodeHasInsufficientMemory",
				},
			},
		},
		{
			desc: "transition to pressure",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Conditions: []v1.NodeCondition{*makeMemoryPressureCondition(false, before, before)},
				},
			},
			pressure:         true,
			expectConditions: []v1.NodeCondition{*makeMemoryPressureCondition(true, now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     "NodeHasInsufficientMemory",
				},
			},
		},
		{
			desc: "transition to no pressure",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Conditions: []v1.NodeCondition{*makeMemoryPressureCondition(true, before, before)},
				},
			},
			pressure:         false,
			expectConditions: []v1.NodeCondition{*makeMemoryPressureCondition(false, now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     "NodeHasSufficientMemory",
				},
			},
		},
		{
			desc: "pressure, no transition",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Conditions: []v1.NodeCondition{*makeMemoryPressureCondition(true, before, before)},
				},
			},
			pressure:         true,
			expectConditions: []v1.NodeCondition{*makeMemoryPressureCondition(true, before, now)},
			expectEvents:     []testEvent{},
		},
		{
			desc: "no pressure, no transition",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Conditions: []v1.NodeCondition{*makeMemoryPressureCondition(false, before, before)},
				},
			},
			pressure:         false,
			expectConditions: []v1.NodeCondition{*makeMemoryPressureCondition(false, before, now)},
			expectEvents:     []testEvent{},
		},
	}
	for _, tc := range cases {
		t.Run(tc.desc, func(t *testing.T) {
			events := []testEvent{}
			recordEventFunc := func(eventType, event string) {
				events = append(events, testEvent{
					eventType: eventType,
					event:     event,
				})
			}
			pressureFunc := func() bool {
				return tc.pressure
			}
			// construct setter
			setter := MemoryPressureCondition(nowFunc, pressureFunc, recordEventFunc)
			// call setter on node
			if err := setter(tc.node); err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			// check expected condition
			assert.True(t, apiequality.Semantic.DeepEqual(tc.expectConditions, tc.node.Status.Conditions),
				"Diff: %s", diff.ObjectDiff(tc.expectConditions, tc.node.Status.Conditions))
			// check expected events
			require.Equal(t, len(tc.expectEvents), len(events))
			for i := range tc.expectEvents {
				assert.Equal(t, tc.expectEvents[i], events[i])
			}
		})
	}
}

func TestPIDPressureCondition(t *testing.T) {
	now := time.Now()
	before := now.Add(-time.Second)
	nowFunc := func() time.Time { return now }

	cases := []struct {
		desc             string
		node             *v1.Node
		pressure         bool
		expectConditions []v1.NodeCondition
		expectEvents     []testEvent
	}{
		{
			desc:             "new, no pressure",
			node:             &v1.Node{},
			pressure:         false,
			expectConditions: []v1.NodeCondition{*makePIDPressureCondition(false, now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     "NodeHasSufficientPID",
				},
			},
		},
		{
			desc:             "new, pressure",
			node:             &v1.Node{},
			pressure:         true,
			expectConditions: []v1.NodeCondition{*makePIDPressureCondition(true, now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     "NodeHasInsufficientPID",
				},
			},
		},
		{
			desc: "transition to pressure",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Conditions: []v1.NodeCondition{*makePIDPressureCondition(false, before, before)},
				},
			},
			pressure:         true,
			expectConditions: []v1.NodeCondition{*makePIDPressureCondition(true, now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     "NodeHasInsufficientPID",
				},
			},
		},
		{
			desc: "transition to no pressure",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Conditions: []v1.NodeCondition{*makePIDPressureCondition(true, before, before)},
				},
			},
			pressure:         false,
			expectConditions: []v1.NodeCondition{*makePIDPressureCondition(false, now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     "NodeHasSufficientPID",
				},
			},
		},
		{
			desc: "pressure, no transition",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Conditions: []v1.NodeCondition{*makePIDPressureCondition(true, before, before)},
				},
			},
			pressure:         true,
			expectConditions: []v1.NodeCondition{*makePIDPressureCondition(true, before, now)},
			expectEvents:     []testEvent{},
		},
		{
			desc: "no pressure, no transition",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Conditions: []v1.NodeCondition{*makePIDPressureCondition(false, before, before)},
				},
			},
			pressure:         false,
			expectConditions: []v1.NodeCondition{*makePIDPressureCondition(false, before, now)},
			expectEvents:     []testEvent{},
		},
	}
	for _, tc := range cases {
		t.Run(tc.desc, func(t *testing.T) {
			events := []testEvent{}
			recordEventFunc := func(eventType, event string) {
				events = append(events, testEvent{
					eventType: eventType,
					event:     event,
				})
			}
			pressureFunc := func() bool {
				return tc.pressure
			}
			// construct setter
			setter := PIDPressureCondition(nowFunc, pressureFunc, recordEventFunc)
			// call setter on node
			if err := setter(tc.node); err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			// check expected condition
			assert.True(t, apiequality.Semantic.DeepEqual(tc.expectConditions, tc.node.Status.Conditions),
				"Diff: %s", diff.ObjectDiff(tc.expectConditions, tc.node.Status.Conditions))
			// check expected events
			require.Equal(t, len(tc.expectEvents), len(events))
			for i := range tc.expectEvents {
				assert.Equal(t, tc.expectEvents[i], events[i])
			}
		})
	}
}

func TestDiskPressureCondition(t *testing.T) {
	now := time.Now()
	before := now.Add(-time.Second)
	nowFunc := func() time.Time { return now }

	cases := []struct {
		desc             string
		node             *v1.Node
		pressure         bool
		expectConditions []v1.NodeCondition
		expectEvents     []testEvent
	}{
		{
			desc:             "new, no pressure",
			node:             &v1.Node{},
			pressure:         false,
			expectConditions: []v1.NodeCondition{*makeDiskPressureCondition(false, now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     "NodeHasNoDiskPressure",
				},
			},
		},
		{
			desc:             "new, pressure",
			node:             &v1.Node{},
			pressure:         true,
			expectConditions: []v1.NodeCondition{*makeDiskPressureCondition(true, now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     "NodeHasDiskPressure",
				},
			},
		},
		{
			desc: "transition to pressure",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Conditions: []v1.NodeCondition{*makeDiskPressureCondition(false, before, before)},
				},
			},
			pressure:         true,
			expectConditions: []v1.NodeCondition{*makeDiskPressureCondition(true, now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     "NodeHasDiskPressure",
				},
			},
		},
		{
			desc: "transition to no pressure",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Conditions: []v1.NodeCondition{*makeDiskPressureCondition(true, before, before)},
				},
			},
			pressure:         false,
			expectConditions: []v1.NodeCondition{*makeDiskPressureCondition(false, now, now)},
			expectEvents: []testEvent{
				{
					eventType: v1.EventTypeNormal,
					event:     "NodeHasNoDiskPressure",
				},
			},
		},
		{
			desc: "pressure, no transition",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Conditions: []v1.NodeCondition{*makeDiskPressureCondition(true, before, before)},
				},
			},
			pressure:         true,
			expectConditions: []v1.NodeCondition{*makeDiskPressureCondition(true, before, now)},
			expectEvents:     []testEvent{},
		},
		{
			desc: "no pressure, no transition",
			node: &v1.Node{
				Status: v1.NodeStatus{
					Conditions: []v1.NodeCondition{*makeDiskPressureCondition(false, before, before)},
				},
			},
			pressure:         false,
			expectConditions: []v1.NodeCondition{*makeDiskPressureCondition(false, before, now)},
			expectEvents:     []testEvent{},
		},
	}
	for _, tc := range cases {
		t.Run(tc.desc, func(t *testing.T) {
			events := []testEvent{}
			recordEventFunc := func(eventType, event string) {
				events = append(events, testEvent{
					eventType: eventType,
					event:     event,
				})
			}
			pressureFunc := func() bool {
				return tc.pressure
			}
			// construct setter
			setter := DiskPressureCondition(nowFunc, pressureFunc, recordEventFunc)
			// call setter on node
			if err := setter(tc.node); err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			// check expected condition
			assert.True(t, apiequality.Semantic.DeepEqual(tc.expectConditions, tc.node.Status.Conditions),
				"Diff: %s", diff.ObjectDiff(tc.expectConditions, tc.node.Status.Conditions))
			// check expected events
			require.Equal(t, len(tc.expectEvents), len(events))
			for i := range tc.expectEvents {
				assert.Equal(t, tc.expectEvents[i], events[i])
			}
		})
	}
}

func TestVolumesInUse(t *testing.T) {
	withVolumesInUse := &v1.Node{
		Status: v1.NodeStatus{
			VolumesInUse: []v1.UniqueVolumeName{"foo"},
		},
	}

	cases := []struct {
		desc               string
		node               *v1.Node
		synced             bool
		volumesInUse       []v1.UniqueVolumeName
		expectVolumesInUse []v1.UniqueVolumeName
	}{
		{
			desc:               "synced",
			node:               withVolumesInUse.DeepCopy(),
			synced:             true,
			volumesInUse:       []v1.UniqueVolumeName{"bar"},
			expectVolumesInUse: []v1.UniqueVolumeName{"bar"},
		},
		{
			desc:               "not synced",
			node:               withVolumesInUse.DeepCopy(),
			synced:             false,
			volumesInUse:       []v1.UniqueVolumeName{"bar"},
			expectVolumesInUse: []v1.UniqueVolumeName{"foo"},
		},
	}

	for _, tc := range cases {
		t.Run(tc.desc, func(t *testing.T) {
			syncedFunc := func() bool {
				return tc.synced
			}
			volumesInUseFunc := func() []v1.UniqueVolumeName {
				return tc.volumesInUse
			}
			// construct setter
			setter := VolumesInUse(syncedFunc, volumesInUseFunc)
			// call setter on node
			if err := setter(tc.node); err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			// check expected volumes
			assert.True(t, apiequality.Semantic.DeepEqual(tc.expectVolumesInUse, tc.node.Status.VolumesInUse),
				"Diff: %s", diff.ObjectDiff(tc.expectVolumesInUse, tc.node.Status.VolumesInUse))
		})
	}
}

func TestVolumeLimits(t *testing.T) {
	const (
		volumeLimitKey = "attachable-volumes-fake-provider"
		volumeLimitVal = 16
	)

	var cases = []struct {
		desc             string
		volumePluginList []volume.VolumePluginWithAttachLimits
		expectNode       *v1.Node
	}{
		{
			desc: "translate limits to capacity and allocatable for plugins that return successfully from GetVolumeLimits",
			volumePluginList: []volume.VolumePluginWithAttachLimits{
				&volumetest.FakeVolumePlugin{
					VolumeLimits: map[string]int64{volumeLimitKey: volumeLimitVal},
				},
			},
			expectNode: &v1.Node{
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						volumeLimitKey: *resource.NewQuantity(volumeLimitVal, resource.DecimalSI),
					},
					Allocatable: v1.ResourceList{
						volumeLimitKey: *resource.NewQuantity(volumeLimitVal, resource.DecimalSI),
					},
				},
			},
		},
		{
			desc: "skip plugins that return errors from GetVolumeLimits",
			volumePluginList: []volume.VolumePluginWithAttachLimits{
				&volumetest.FakeVolumePlugin{
					VolumeLimitsError: fmt.Errorf("foo"),
				},
			},
			expectNode: &v1.Node{},
		},
		{
			desc:       "no plugins",
			expectNode: &v1.Node{},
		},
	}

	for _, tc := range cases {
		t.Run(tc.desc, func(t *testing.T) {
			volumePluginListFunc := func() []volume.VolumePluginWithAttachLimits {
				return tc.volumePluginList
			}
			// construct setter
			setter := VolumeLimits(volumePluginListFunc)
			// call setter on node
			node := &v1.Node{}
			if err := setter(node); err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			// check expected node
			assert.True(t, apiequality.Semantic.DeepEqual(tc.expectNode, node),
				"Diff: %s", diff.ObjectDiff(tc.expectNode, node))
		})
	}
}

// Test Helpers:

// sortableNodeAddress is a type for sorting []v1.NodeAddress
type sortableNodeAddress []v1.NodeAddress

func (s sortableNodeAddress) Len() int { return len(s) }
func (s sortableNodeAddress) Less(i, j int) bool {
	return (string(s[i].Type) + s[i].Address) < (string(s[j].Type) + s[j].Address)
}
func (s sortableNodeAddress) Swap(i, j int) { s[j], s[i] = s[i], s[j] }

func sortNodeAddresses(addrs sortableNodeAddress) {
	sort.Sort(addrs)
}

// testEvent is used to record events for tests
type testEvent struct {
	eventType string
	event     string
	message   string
}

// makeImageList randomly generates a list of images with the given count
func makeImageList(numImages, numTags, minSize, maxSize int32) []kubecontainer.Image {
	images := make([]kubecontainer.Image, numImages)
	for i := range images {
		image := &images[i]
		image.ID = string(uuid.NewUUID())
		image.RepoTags = makeImageTags(numTags)
		image.Size = rand.Int63nRange(int64(minSize), int64(maxSize+1))
	}
	return images
}

func makeExpectedImageList(imageList []kubecontainer.Image, maxImages, maxNames int32) []v1.ContainerImage {
	// copy the imageList, we do not want to mutate it in-place and accidentally edit a test case
	images := make([]kubecontainer.Image, len(imageList))
	copy(images, imageList)
	// sort images by size
	sort.Sort(sliceutils.ByImageSize(images))
	// convert to []v1.ContainerImage and truncate the list of names
	expectedImages := make([]v1.ContainerImage, len(images))
	for i := range images {
		image := &images[i]
		expectedImage := &expectedImages[i]
		names := append(image.RepoDigests, image.RepoTags...)
		if len(names) > int(maxNames) {
			names = names[0:maxNames]
		}
		expectedImage.Names = names
		expectedImage.SizeBytes = image.Size
	}
	// -1 means no limit, truncate result list if necessary.
	if maxImages > -1 &&
		int(maxImages) < len(expectedImages) {
		return expectedImages[0:maxImages]
	}
	return expectedImages
}

func makeImageTags(num int32) []string {
	tags := make([]string, num)
	for i := range tags {
		tags[i] = "k8s.gcr.io:v" + strconv.Itoa(i)
	}
	return tags
}

func makeReadyCondition(ready bool, message string, transition, heartbeat time.Time) *v1.NodeCondition {
	if ready {
		return &v1.NodeCondition{
			Type:               v1.NodeReady,
			Status:             v1.ConditionTrue,
			Reason:             "KubeletReady",
			Message:            message,
			LastTransitionTime: metav1.NewTime(transition),
			LastHeartbeatTime:  metav1.NewTime(heartbeat),
		}
	}
	return &v1.NodeCondition{
		Type:               v1.NodeReady,
		Status:             v1.ConditionFalse,
		Reason:             "KubeletNotReady",
		Message:            message,
		LastTransitionTime: metav1.NewTime(transition),
		LastHeartbeatTime:  metav1.NewTime(heartbeat),
	}
}

func makeMemoryPressureCondition(pressure bool, transition, heartbeat time.Time) *v1.NodeCondition {
	if pressure {
		return &v1.NodeCondition{
			Type:               v1.NodeMemoryPressure,
			Status:             v1.ConditionTrue,
			Reason:             "KubeletHasInsufficientMemory",
			Message:            "kubelet has insufficient memory available",
			LastTransitionTime: metav1.NewTime(transition),
			LastHeartbeatTime:  metav1.NewTime(heartbeat),
		}
	}
	return &v1.NodeCondition{
		Type:               v1.NodeMemoryPressure,
		Status:             v1.ConditionFalse,
		Reason:             "KubeletHasSufficientMemory",
		Message:            "kubelet has sufficient memory available",
		LastTransitionTime: metav1.NewTime(transition),
		LastHeartbeatTime:  metav1.NewTime(heartbeat),
	}
}

func makePIDPressureCondition(pressure bool, transition, heartbeat time.Time) *v1.NodeCondition {
	if pressure {
		return &v1.NodeCondition{
			Type:               v1.NodePIDPressure,
			Status:             v1.ConditionTrue,
			Reason:             "KubeletHasInsufficientPID",
			Message:            "kubelet has insufficient PID available",
			LastTransitionTime: metav1.NewTime(transition),
			LastHeartbeatTime:  metav1.NewTime(heartbeat),
		}
	}
	return &v1.NodeCondition{
		Type:               v1.NodePIDPressure,
		Status:             v1.ConditionFalse,
		Reason:             "KubeletHasSufficientPID",
		Message:            "kubelet has sufficient PID available",
		LastTransitionTime: metav1.NewTime(transition),
		LastHeartbeatTime:  metav1.NewTime(heartbeat),
	}
}

func makeDiskPressureCondition(pressure bool, transition, heartbeat time.Time) *v1.NodeCondition {
	if pressure {
		return &v1.NodeCondition{
			Type:               v1.NodeDiskPressure,
			Status:             v1.ConditionTrue,
			Reason:             "KubeletHasDiskPressure",
			Message:            "kubelet has disk pressure",
			LastTransitionTime: metav1.NewTime(transition),
			LastHeartbeatTime:  metav1.NewTime(heartbeat),
		}
	}
	return &v1.NodeCondition{
		Type:               v1.NodeDiskPressure,
		Status:             v1.ConditionFalse,
		Reason:             "KubeletHasNoDiskPressure",
		Message:            "kubelet has no disk pressure",
		LastTransitionTime: metav1.NewTime(transition),
		LastHeartbeatTime:  metav1.NewTime(heartbeat),
	}
}
