backend/test: parallelize slow tests

internal/backend/test/tests.go

@@ -10,11 +10,13 @@ import (
 	"os"
 	"reflect"
 	"sort"
+	"sync"
 	"testing"
 	"time"
 
 	"github.com/restic/restic/internal/errors"
 	"github.com/restic/restic/internal/restic"
+	"golang.org/x/sync/errgroup"
 
 	"github.com/restic/restic/internal/test"
 
@@ -276,17 +278,27 @@ func (s *Suite[C]) TestList(t *testing.T) {
 	}
 
 	list1 := make(map[restic.ID]int64)
+	var m sync.Mutex
 
+	wg, ctx := errgroup.WithContext(context.TODO())
 	for i := 0; i < numTestFiles; i++ {
 		data := test.Random(random.Int(), random.Intn(100)+55)
+		wg.Go(func() error {
 			id := restic.Hash(data)
 			h := backend.Handle{Type: backend.PackFile, Name: id.String()}
-		err := b.Save(context.TODO(), h, backend.NewByteReader(data, b.Hasher()))
+			err := b.Save(ctx, h, backend.NewByteReader(data, b.Hasher()))
+
+			m.Lock()
+			defer m.Unlock()
+			list1[id] = int64(len(data))
+			return err
+		})
+	}
+
+	err = wg.Wait()
 	if err != nil {
 		t.Fatal(err)
 	}
-		list1[id] = int64(len(data))
-	}
 
 	t.Logf("wrote %v files", len(list1))
 
@@ -777,16 +789,19 @@ func delayedList(t testing.TB, b backend.Backend, tpe backend.FileType, max int,
 
 // TestBackend tests all functions of the backend.
 func (s *Suite[C]) TestBackend(t *testing.T) {
+	for _, tpe := range []backend.FileType{
+		backend.PackFile, backend.KeyFile, backend.LockFile,
+		backend.SnapshotFile, backend.IndexFile,
+	} {
+		t.Run(tpe.String(), func(t *testing.T) {
+			t.Parallel()
+
 			b := s.open(t)
 			defer s.close(t, b)
 
 			test.Assert(t, !b.IsNotExist(nil), "IsNotExist() recognized nil error")
 			test.Assert(t, !b.IsPermanentError(nil), "IsPermanentError() recognized nil error")
 
-	for _, tpe := range []backend.FileType{
-		backend.PackFile, backend.KeyFile, backend.LockFile,
-		backend.SnapshotFile, backend.IndexFile,
-	} {
 			// detect non-existing files
 			for _, ts := range testStrings {
 				id, err := restic.ParseID(ts.id)
@@ -896,6 +911,7 @@ func (s *Suite[C]) TestBackend(t *testing.T) {
 			}
 
 			test.OK(t, s.delayedRemove(t, b, handles...))
+		})
 	}
 }