multi: context.Background() -> t.Context()

Use the new feature of Go 1.24, fix linter warnings.

This change was produced by:
 - running golangci-lint run --fix
 - sed 's/context.Background/t.Context/' -i `git grep -l context.Background | grep test.go`
 - manually fixing broken tests
 - itest, lntest: use ht.Context() where ht or hn is available
 - in HarnessNode.Stop() we keep using context.Background(), because it is
   called from a cleanup handler in which t.Context() is canceled already.

macaroons/bake_test.go

@@ -1,7 +1,6 @@
 package macaroons_test
 
 import (
-	"context"
 	"encoding/hex"
 	"testing"
 
@@ -49,7 +48,7 @@ func TestBakeFromRootKey(t *testing.T) {
 	md := metadata.New(map[string]string{
 		"macaroon": hex.EncodeToString(macaroonBytes),
 	})
-	macCtx := metadata.NewIncomingContext(context.Background(), md)
+	macCtx := metadata.NewIncomingContext(t.Context(), md)
 
 	// The macaroon should be valid for the service, since the root key was
 	// the same.

macaroons/fuzz_test.go

@@ -1,7 +1,6 @@
 package macaroons
 
 import (
-	"context"
 	"testing"
 
 	"gopkg.in/macaroon-bakery.v2/bakery"
@@ -17,7 +16,7 @@ func FuzzUnmarshalMacaroon(f *testing.F) {
 
 func FuzzAuthChecker(f *testing.F) {
 	rootKeyStore := bakery.NewMemRootKeyStore()
-	ctx := context.Background()
+	ctx := f.Context()
 
 	f.Fuzz(func(t *testing.T, location, entity, action, method string,
 		rootKey, id []byte) {

macaroons/service_test.go

@@ -1,7 +1,6 @@
 package macaroons_test
 
 import (
-	"context"
 	"encoding/hex"
 	"path"
 	"testing"
@@ -55,7 +54,7 @@ func setupTestRootKeyStorage(t *testing.T) kvdb.Backend {
 // TestNewService tests the creation of the macaroon service.
 func TestNewService(t *testing.T) {
 	t.Parallel()
-	ctx := context.Background()
+	ctx := t.Context()
 
 	// First, initialize a dummy DB file with a store that the service
 	// can read from. Make sure the file is removed in the end.
@@ -109,7 +108,7 @@ func TestNewService(t *testing.T) {
 // incoming context.
 func TestValidateMacaroon(t *testing.T) {
 	t.Parallel()
-	ctx := context.Background()
+	ctx := t.Context()
 
 	// First, initialize the service and unlock it.
 	db := setupTestRootKeyStorage(t)
@@ -157,7 +156,7 @@ func TestValidateMacaroon(t *testing.T) {
 // TestListMacaroonIDs checks that ListMacaroonIDs returns the expected result.
 func TestListMacaroonIDs(t *testing.T) {
 	t.Parallel()
-	ctx := context.Background()
+	ctx := t.Context()
 
 	// First, initialize a dummy DB file with a store that the service
 	// can read from. Make sure the file is removed in the end.
@@ -192,7 +191,7 @@ func TestListMacaroonIDs(t *testing.T) {
 func TestDeleteMacaroonID(t *testing.T) {
 	t.Parallel()
 
-	ctxb := context.Background()
+	ctxb := t.Context()
 
 	// First, initialize a dummy DB file with a store that the service
 	// can read from. Make sure the file is removed in the end.
@@ -308,7 +307,7 @@ func TestCloneMacaroons(t *testing.T) {
 func TestMacaroonVersionDecode(t *testing.T) {
 	t.Parallel()
 
-	ctxb := context.Background()
+	ctxb := t.Context()
 
 	// First, initialize a dummy DB file with a store that the service
 	// can read from. Make sure the file is removed in the end.

macaroons/store_test.go

@@ -59,7 +59,7 @@ func openTestStore(t *testing.T, tempDir string) *macaroons.RootKeyStorage {
 // reading keys and closing it.
 func TestStore(t *testing.T) {
 	t.Parallel()
-	ctx := context.Background()
+	ctx := t.Context()
 
 	tempDir, store := newTestStore(t)