golangci-lint: enable and fix thelper linter

.golangci.yaml

@@ -314,6 +314,7 @@ linters:
     - staticcheck
     - stylecheck
     - testifylint
+    - thelper
     - typecheck
     - unconvert
     - unparam

internal/restartabletest/restartable_delegate.go

@@ -75,6 +75,7 @@ func RunRestartableDelegateTests(
 	newMock func() Mockable,
 	tests ...RestartableDelegateTest,
 ) {
+	t.Helper()
 	for _, tc := range tests {
 		t.Run(tc.Function, func(t *testing.T) {
 			p := new(MockRestartableProcess)

internal/velero/images_test.go

@@ -86,6 +86,7 @@ func TestImageRegistry(t *testing.T) {
 }
 
 func testDefaultImage(t *testing.T, defaultImageFn func() string, imageName string) {
+	t.Helper()
 	testCases := []struct {
 		name              string
 		buildInfoVersion  string

pkg/controller/backup_deletion_controller_test.go

@@ -77,6 +77,7 @@ func defaultTestDbr() *velerov1api.DeleteBackupRequest {
 }
 
 func setupBackupDeletionControllerTest(t *testing.T, req *velerov1api.DeleteBackupRequest, objects ...runtime.Object) *backupDeletionControllerTestData {
+	t.Helper()
 	var (
 		fakeClient        = velerotest.NewFakeControllerRuntimeClient(t, append(objects, req)...)
 		volumeSnapshotter = &velerotest.FakeVolumeSnapshotter{SnapshotsTaken: sets.NewString()}

pkg/controller/backup_repository_controller_test.go

@@ -38,6 +38,7 @@ import (
 const testMaintenanceFrequency = 10 * time.Minute
 
 func mockBackupRepoReconciler(t *testing.T, mockOn string, arg interface{}, ret interface{}) *BackupRepoReconciler {
+	t.Helper()
 	mgr := &repomokes.Manager{}
 	if mockOn != "" {
 		mgr.On(mockOn, arg).Return(ret)

pkg/plugin/clientmgmt/manager_test.go

@@ -282,6 +282,7 @@ func getPluginTest(
 	expectedResultFunc func(name string, sharedPluginProcess process.RestartableProcess) interface{},
 	reinitializable bool,
 ) {
+	t.Helper()
 	logger := test.NewLogger()
 	logLevel := logrus.InfoLevel
 

pkg/restore/restore_test.go

@@ -3576,6 +3576,7 @@ func Test_getOrderedResources(t *testing.T) {
 // order. Any resources *not* in resourcePriorities are required to come *after* all
 // resources in any order.
 func assertResourceCreationOrder(t *testing.T, resourcePriorities []string, createdResources []resourceID) {
+	t.Helper()
 	// lastSeen tracks the index in 'resourcePriorities' of the last resource type
 	// we saw created. Once we've seen a resource in 'resourcePriorities', we should
 	// never see another instance of a prior resource.

pkg/test/comparisons.go

@@ -39,6 +39,7 @@ import (
 // corresponding expected Action, and that each expected Action
 // has a corresponding actual Action.
 func CompareActions(t *testing.T, expected, actual []core.Action) {
+	t.Helper()
 	assert.Len(t, actual, len(expected))
 
 	for _, e := range expected {
@@ -73,6 +74,7 @@ func CompareActions(t *testing.T, expected, actual []core.Action) {
 // with the provided decode func and has no extraneous fields, and that
 // the decoded patch matches the expected.
 func ValidatePatch(t *testing.T, action core.Action, expected interface{}, decodeFunc func(*json.Decoder) (interface{}, error)) {
+	t.Helper()
 	patchAction, ok := action.(core.PatchAction)
 	require.True(t, ok, "action is not a PatchAction")
 
@@ -96,6 +98,7 @@ func TimesAreEqual(t1, t2 time.Time) bool {
 // This function exists in order to make sure time.Time and metav1.Time objects
 // can be compared correctly. See https://github.com/stretchr/testify/issues/502.
 func AssertDeepEqual(t *testing.T, expected, actual interface{}) bool {
+	t.Helper()
 	// By default, the equality.Semantic object doesn't have a function for comparing time.Times
 	err := equality.Semantic.AddFunc(TimesAreEqual)
 	if err != nil {
@@ -114,6 +117,7 @@ func AssertDeepEqual(t *testing.T, expected, actual interface{}) bool {
 // AssertErrorMatches asserts that if expected is the empty string, actual
 // is nil, otherwise, that actual's error string matches expected.
 func AssertErrorMatches(t *testing.T, expected string, actual error) bool {
+	t.Helper()
 	if expected != "" {
 		return assert.EqualError(t, actual, expected)
 	}

pkg/test/fake_controller_runtime_client.go

@@ -33,6 +33,7 @@ import (
 )
 
 func NewFakeControllerRuntimeClientBuilder(t *testing.T) *k8sfake.ClientBuilder {
+	t.Helper()
 	scheme := runtime.NewScheme()
 
 	require.NoError(t, velerov1api.AddToScheme(scheme))
@@ -46,6 +47,7 @@ func NewFakeControllerRuntimeClientBuilder(t *testing.T) *k8sfake.ClientBuilder
 }
 
 func NewFakeControllerRuntimeClient(t *testing.T, initObjs ...runtime.Object) client.Client {
+	t.Helper()
 	scheme := runtime.NewScheme()
 
 	require.NoError(t, velerov1api.AddToScheme(scheme))
@@ -62,5 +64,6 @@ func NewFakeControllerRuntimeWatchClient(
 	t *testing.T,
 	initObjs ...runtime.Object,
 ) client.WithWatch {
+	t.Helper()
 	return NewFakeControllerRuntimeClientBuilder(t).WithRuntimeObjects(initObjs...).Build()
 }

pkg/test/tar_writer.go

@@ -40,6 +40,7 @@ type TarWriter struct {
 }
 
 func NewTarWriter(t *testing.T) *TarWriter {
+	t.Helper()
 	tw := new(TarWriter)
 	tw.t = t
 	tw.buf = new(bytes.Buffer)