Skip failing Windows unit tests

As discussed during the SIG Testing meeting on January 10, 2023, failing
Windows unit tests are now skipped.
These changes should be reverted when the unit tests wil get fixed.
Mentioned SIG Testing meeting:
https://docs.google.com/document/d/1z8MQpr_jTwhmjLMUaqQyBk1EYG_Y_3D4y4YdMJ7V1Kk/edit#heading=h.qwblxf2uhgoo

pkg/apis/batch/validation/validation_test.go

@@ -1618,23 +1618,6 @@ func TestValidateCronJob(t *testing.T) {
 				},
 			},
 		},
-		"spec.timeZone: Invalid value: \"Continent/Zone \": unknown time zone Continent/Zone ": {
-			ObjectMeta: metav1.ObjectMeta{
-				Name:      "mycronjob",
-				Namespace: metav1.NamespaceDefault,
-				UID:       types.UID("1a2b3c"),
-			},
-			Spec: batch.CronJobSpec{
-				Schedule:          "0 * * * *",
-				TimeZone:          &timeZoneBadSuffix,
-				ConcurrencyPolicy: batch.AllowConcurrent,
-				JobTemplate: batch.JobTemplateSpec{
-					Spec: batch.JobSpec{
-						Template: validPodTemplateSpec,
-					},
-				},
-			},
-		},
 		"spec.timeZone: Invalid value: \"Continent/InvalidZone\": unknown time zone  Continent/InvalidZone": {
 			ObjectMeta: metav1.ObjectMeta{
 				Name:      "mycronjob",
@@ -1900,6 +1883,28 @@ func TestValidateCronJob(t *testing.T) {
 		},
 	}
 
+	// NOTE: The following test doesn't fail on Windows.
+	// When opening a file on Windows, syscall.Open is called, which will trim the whitespace suffix.
+	if runtime.GOOS != "windows" {
+		errorCases["spec.timeZone: Invalid value: \"Continent/Zone \": unknown time zone Continent/Zone "] = batch.CronJob{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:      "mycronjob",
+				Namespace: metav1.NamespaceDefault,
+				UID:       types.UID("1a2b3c"),
+			},
+			Spec: batch.CronJobSpec{
+				Schedule:          "0 * * * *",
+				TimeZone:          &timeZoneBadSuffix,
+				ConcurrencyPolicy: batch.AllowConcurrent,
+				JobTemplate: batch.JobTemplateSpec{
+					Spec: batch.JobSpec{
+						Template: validPodTemplateSpec,
+					},
+				},
+			},
+		}
+	}
+
 	for k, v := range errorCases {
 		t.Run(k, func(t *testing.T) {
 			errs := ValidateCronJobCreate(&v, corevalidation.PodValidationOptions{})

pkg/kubelet/kubeletconfig/checkpoint/store/fsstore_test.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"path/filepath"
 	"reflect"
+	"runtime"
 	"testing"
 	"time"
 
@@ -257,14 +258,20 @@ func TestFsStoreLoad(t *testing.T) {
 		uid             types.UID
 		resourceVersion string
 		err             string
+		skipOnWindows   bool
 	}{
-		{"checkpoint exists", uid, resourceVersion, ""},
-		{"checkpoint does not exist", "bogus-uid", "bogus-resourceVersion", "no checkpoint for source"},
-		{"ambiguous UID", "", "bogus-resourceVersion", "empty UID is ambiguous"},
-		{"ambiguous ResourceVersion", "bogus-uid", "", "empty ResourceVersion is ambiguous"},
+		{"checkpoint exists", uid, resourceVersion, "", true},
+		{"checkpoint does not exist", "bogus-uid", "bogus-resourceVersion", "no checkpoint for source", false},
+		{"ambiguous UID", "", "bogus-resourceVersion", "empty UID is ambiguous", false},
+		{"ambiguous ResourceVersion", "bogus-uid", "", "empty ResourceVersion is ambiguous", false},
 	}
 	for _, c := range cases {
 		t.Run(c.desc, func(t *testing.T) {
+			// Skip tests that fail on Windows, as discussed during the SIG Testing meeting from January 10, 2023
+			if c.skipOnWindows && runtime.GOOS == "windows" {
+				t.Skip("Skipping test that fails on Windows")
+			}
+
 			source, _, err := checkpoint.NewRemoteConfigSource(&apiv1.NodeConfigSource{
 				ConfigMap: &apiv1.ConfigMapNodeConfigSource{
 					Name:             "name",

pkg/kubelet/kubeletconfig/configfiles/configfiles_test.go

@@ -20,6 +20,7 @@ import (
 	"errors"
 	"fmt"
 	"path/filepath"
+	goruntime "runtime"
 	"testing"
 
 	apiequality "k8s.io/apimachinery/pkg/api/equality"
@@ -43,6 +44,7 @@ func TestLoad(t *testing.T) {
 		expect        *kubeletconfig.KubeletConfiguration
 		err           string
 		strictErr     bool
+		skipOnWindows bool
 	}{
 		// missing file
 		{
@@ -94,11 +96,13 @@ func TestLoad(t *testing.T) {
 			file: newString(`kind: KubeletConfiguration
 apiVersion: kubelet.config.k8s.io/v1beta1`),
 			expect:        newConfig(t),
+			skipOnWindows: true,
 		},
 		{
 			desc:          "default from json",
 			file:          newString(`{"kind":"KubeletConfiguration","apiVersion":"kubelet.config.k8s.io/v1beta1"}`),
 			expect:        newConfig(t),
+			skipOnWindows: true,
 		},
 
 		// relative path
@@ -112,6 +116,7 @@ staticPodPath: %s`, relativePath)),
 				kc.StaticPodPath = filepath.Join(configDir, relativePath)
 				return kc
 			}(),
+			skipOnWindows: true,
 		},
 		{
 			desc: "json, relative path is resolved",
@@ -121,6 +126,7 @@ staticPodPath: %s`, relativePath)),
 				kc.StaticPodPath = filepath.Join(configDir, relativePath)
 				return kc
 			}(),
+			skipOnWindows: true,
 		},
 		{
 			// This should fail from v1beta2+
@@ -136,6 +142,7 @@ staticPodPath: %s/foo`, relativePath, relativePath)),
 				kc.StaticPodPath = filepath.Join(configDir, relativePath, "foo")
 				return kc
 			}(),
+			skipOnWindows: true,
 		},
 		{
 			// This should fail from v1beta2+
@@ -146,11 +153,17 @@ foo: bar`),
 			// err:       "found unknown field: foo",
 			// strictErr: true,
 			expect:        newConfig(t),
+			skipOnWindows: true,
 		},
 	}
 
 	for _, c := range cases {
 		t.Run(c.desc, func(t *testing.T) {
+			// Skip tests that fail on Windows, as discussed during the SIG Testing meeting from January 10, 2023
+			if c.skipOnWindows && goruntime.GOOS == "windows" {
+				t.Skip("Skipping test that fails on Windows")
+			}
+
 			fs := utilfs.NewTempFs()
 			fs.MkdirAll(configDir, 0777)
 			path := filepath.Join(configDir, kubeletFile)
@@ -184,10 +197,11 @@ func TestResolveRelativePaths(t *testing.T) {
 		desc          string
 		path          string
 		expect        string
+		skipOnWindows bool
 	}{
-		{"empty path", "", ""},
-		{"absolute path", absolutePath, absolutePath},
-		{"relative path", relativePath, filepath.Join(configDir, relativePath)},
+		{"empty path", "", "", false},
+		{"absolute path", absolutePath, absolutePath, true},
+		{"relative path", relativePath, filepath.Join(configDir, relativePath), false},
 	}
 
 	paths := kubeletconfig.KubeletConfigurationPathRefs(newConfig(t))
@@ -196,6 +210,11 @@ func TestResolveRelativePaths(t *testing.T) {
 	}
 	for _, c := range cases {
 		t.Run(c.desc, func(t *testing.T) {
+			// Skip tests that fail on Windows, as discussed during the SIG Testing meeting from January 10, 2023
+			if c.skipOnWindows && goruntime.GOOS == "windows" {
+				t.Skip("Skipping test that fails on Windows")
+			}
+
 			// set the path, resolve it, and check if it resolved as we would expect
 			*(paths[0]) = c.path
 			resolveRelativePaths(paths, configDir)

pkg/kubelet/network/dns/dns_test.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"net"
 	"os"
+	goruntime "runtime"
 	"strconv"
 	"strings"
 	"testing"
@@ -456,19 +457,26 @@ func TestGetPodDNS(t *testing.T) {
 	testCases := []struct {
 		desc              string
 		expandedDNSConfig bool
+		skipOnWindows     bool
 	}{
 		{
 			desc:              "Not ExpandedDNSConfig",
 			expandedDNSConfig: false,
+			skipOnWindows:     true,
 		},
 		{
 			desc:              "ExpandedDNSConfig",
 			expandedDNSConfig: true,
+			skipOnWindows:     true,
 		},
 	}
 
 	for _, tc := range testCases {
 		t.Run(tc.desc, func(t *testing.T) {
+			// Skip tests that fail on Windows, as discussed during the SIG Testing meeting from January 10, 2023
+			if tc.skipOnWindows && goruntime.GOOS == "windows" {
+				t.Skip("Skipping test that fails on Windows")
+			}
 			defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.ExpandedDNSConfig, tc.expandedDNSConfig)()
 			testGetPodDNS(t)
 		})

pkg/kubelet/pluginmanager/cache/actual_state_of_world_test.go

@@ -17,6 +17,7 @@ limitations under the License.
 package cache
 
 import (
+	"runtime"
 	"testing"
 	"time"
 
@@ -117,6 +118,11 @@ func Test_ASW_RemovePlugin_Positive(t *testing.T) {
 // Verifies PluginExistsWithCorrectTimestamp returns false for an existing
 // plugin with the wrong timestamp
 func Test_ASW_PluginExistsWithCorrectTimestamp_Negative_WrongTimestamp(t *testing.T) {
+	// Skip tests that fail on Windows, as discussed during the SIG Testing meeting from January 10, 2023
+	if runtime.GOOS == "windows" {
+		t.Skip("Skipping test that fails on Windows")
+	}
+
 	// First, add a plugin
 	asw := NewActualStateOfWorld()
 	pluginInfo := PluginInfo{

pkg/kubelet/pluginmanager/cache/desired_state_of_world_test.go

@@ -17,6 +17,7 @@ limitations under the License.
 package cache
 
 import (
+	"runtime"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -53,6 +54,11 @@ func Test_DSW_AddOrUpdatePlugin_Positive_NewPlugin(t *testing.T) {
 // Verifies the timestamp the existing plugin is updated
 // Verifies newly added plugin returns true for PluginExists()
 func Test_DSW_AddOrUpdatePlugin_Positive_ExistingPlugin(t *testing.T) {
+	// Skip tests that fail on Windows, as discussed during the SIG Testing meeting from January 10, 2023
+	if runtime.GOOS == "windows" {
+		t.Skip("Skipping test that fails on Windows")
+	}
+
 	dsw := NewDesiredStateOfWorld()
 	socketPath := "/var/lib/kubelet/device-plugins/test-plugin.sock"
 	// Adding the plugin for the first time

pkg/kubelet/pluginmanager/reconciler/reconciler_test.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"runtime"
 	"testing"
 	"time"
 
@@ -167,6 +168,11 @@ func Test_Run_Positive_DoNothing(t *testing.T) {
 // Calls Run()
 // Verifies the actual state of world contains that plugin
 func Test_Run_Positive_Register(t *testing.T) {
+	// Skip tests that fail on Windows, as discussed during the SIG Testing meeting from January 10, 2023
+	if runtime.GOOS == "windows" {
+		t.Skip("Skipping test that fails on Windows")
+	}
+
 	defer cleanup(t)
 
 	dsw := cache.NewDesiredStateOfWorld()
@@ -212,6 +218,11 @@ func Test_Run_Positive_Register(t *testing.T) {
 // Deletes plugin from desired state of world.
 // Verifies that plugin no longer exists in actual state of world.
 func Test_Run_Positive_RegisterThenUnregister(t *testing.T) {
+	// Skip tests that fail on Windows, as discussed during the SIG Testing meeting from January 10, 2023
+	if runtime.GOOS == "windows" {
+		t.Skip("Skipping test that fails on Windows")
+	}
+
 	defer cleanup(t)
 
 	dsw := cache.NewDesiredStateOfWorld()
@@ -268,6 +279,11 @@ func Test_Run_Positive_RegisterThenUnregister(t *testing.T) {
 // Verifies that the plugin is reregistered.
 // Verifies the plugin with updated timestamp now in actual state of world.
 func Test_Run_Positive_ReRegister(t *testing.T) {
+	// Skip tests that fail on Windows, as discussed during the SIG Testing meeting from January 10, 2023
+	if runtime.GOOS == "windows" {
+		t.Skip("Skipping test that fails on Windows")
+	}
+
 	defer cleanup(t)
 
 	dsw := cache.NewDesiredStateOfWorld()

pkg/kubelet/stats/cadvisor_stats_provider_test.go

@@ -18,6 +18,7 @@ package stats
 
 import (
 	"context"
+	"runtime"
 	"testing"
 
 	"github.com/golang/mock/gomock"
@@ -39,6 +40,11 @@ import (
 )
 
 func TestFilterTerminatedContainerInfoAndAssembleByPodCgroupKey(t *testing.T) {
+	// Skip tests that fail on Windows, as discussed during the SIG Testing meeting from January 10, 2023
+	if runtime.GOOS == "windows" {
+		t.Skip("Skipping test that fails on Windows")
+	}
+
 	const (
 		seedPastPod0Infra      = 1000
 		seedPastPod0Container0 = 2000