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.

kvdb/etcd/commit_queue_test.go

@@ -40,7 +40,7 @@ func TestCommitQueue(t *testing.T) {
 		}
 	}
 
-	ctx := context.Background()
+	ctx := t.Context()
 	ctx, cancel := context.WithCancel(ctx)
 	q := NewCommitQueue(ctx)
 	defer q.Stop()

kvdb/etcd/db_test.go

@@ -19,7 +19,7 @@ func TestDump(t *testing.T) {
 
 	f := NewEtcdTestFixture(t)
 
-	db, err := newEtcdBackend(context.Background(), f.BackendConfig())
+	db, err := newEtcdBackend(t.Context(), f.BackendConfig())
 	require.NoError(t, err)
 
 	err = db.Update(func(tx walletdb.ReadWriteTx) error {
@@ -53,7 +53,7 @@ func TestAbortContext(t *testing.T) {
 
 	f := NewEtcdTestFixture(t)
 
-	ctx, cancel := context.WithCancel(context.Background())
+	ctx, cancel := context.WithCancel(t.Context())
 
 	config := f.BackendConfig()
 
@@ -83,7 +83,7 @@ func TestNewEtcdClient(t *testing.T) {
 	f := NewEtcdTestFixture(t)
 
 	client, ctx, cancel, err := NewEtcdClient(
-		context.Background(), f.BackendConfig(),
+		t.Context(), f.BackendConfig(),
 	)
 	require.NoError(t, err)
 	t.Cleanup(cancel)

kvdb/etcd/readwrite_tx_test.go

@@ -4,7 +4,6 @@
 package etcd
 
 import (
-	"context"
 	"testing"
 
 	"github.com/btcsuite/btcwallet/walletdb"
@@ -16,7 +15,7 @@ func TestChangeDuringManualTx(t *testing.T) {
 
 	f := NewEtcdTestFixture(t)
 
-	db, err := newEtcdBackend(context.Background(), f.BackendConfig())
+	db, err := newEtcdBackend(t.Context(), f.BackendConfig())
 	require.NoError(t, err)
 
 	tx, err := db.BeginReadWriteTx()
@@ -44,7 +43,7 @@ func TestChangeDuringUpdate(t *testing.T) {
 
 	f := NewEtcdTestFixture(t)
 
-	db, err := newEtcdBackend(context.Background(), f.BackendConfig())
+	db, err := newEtcdBackend(t.Context(), f.BackendConfig())
 	require.NoError(t, err)
 
 	count := 0

kvdb/etcd/stm_test.go

@@ -23,7 +23,7 @@ func TestPutToEmpty(t *testing.T) {
 	t.Parallel()
 
 	f := NewEtcdTestFixture(t)
-	ctx, cancel := context.WithCancel(context.Background())
+	ctx, cancel := context.WithCancel(t.Context())
 
 	txQueue := NewCommitQueue(ctx)
 	t.Cleanup(func() {
@@ -50,7 +50,7 @@ func TestGetPutDel(t *testing.T) {
 	t.Parallel()
 
 	f := NewEtcdTestFixture(t)
-	ctx, cancel := context.WithCancel(context.Background())
+	ctx, cancel := context.WithCancel(t.Context())
 
 	txQueue := NewCommitQueue(ctx)
 	t.Cleanup(func() {
@@ -151,7 +151,7 @@ func testFirstLastNextPrev(t *testing.T, prefetchKeys []string,
 	prefetchRange []string, expectedCallCount int) {
 
 	f := NewEtcdTestFixture(t)
-	ctx, cancel := context.WithCancel(context.Background())
+	ctx, cancel := context.WithCancel(t.Context())
 
 	txQueue := NewCommitQueue(ctx)
 	t.Cleanup(func() {
@@ -325,7 +325,7 @@ func TestCommitError(t *testing.T) {
 	t.Parallel()
 
 	f := NewEtcdTestFixture(t)
-	ctx, cancel := context.WithCancel(context.Background())
+	ctx, cancel := context.WithCancel(t.Context())
 
 	txQueue := NewCommitQueue(ctx)
 	t.Cleanup(func() {
@@ -374,7 +374,7 @@ func TestManualTxError(t *testing.T) {
 	t.Parallel()
 
 	f := NewEtcdTestFixture(t)
-	ctx, cancel := context.WithCancel(context.Background())
+	ctx, cancel := context.WithCancel(t.Context())
 
 	txQueue := NewCommitQueue(ctx)
 	t.Cleanup(func() {

kvdb/etcd/walletdb_interface_test.go

@@ -4,7 +4,6 @@
 package etcd
 
 import (
-	"context"
 	"testing"
 
 	"github.com/btcsuite/btcwallet/walletdb/walletdbtest"
@@ -15,5 +14,5 @@ import (
 func TestWalletDBInterface(t *testing.T) {
 	f := NewEtcdTestFixture(t)
 	cfg := f.BackendConfig()
-	walletdbtest.TestInterface(t, dbType, context.Background(), &cfg)
+	walletdbtest.TestInterface(t, dbType, t.Context(), &cfg)
 }