remove usages of repo.Backend() from tests

internal/index/index_parallel_test.go

@@ -15,7 +15,7 @@ import (
 var repoFixture = filepath.Join("..", "repository", "testdata", "test-repo.tar.gz")
 
 func TestRepositoryForAllIndexes(t *testing.T) {
-	repo, cleanup := repository.TestFromFixture(t, repoFixture)
+	repo, _, cleanup := repository.TestFromFixture(t, repoFixture)
 	defer cleanup()
 
 	expectedIndexIDs := restic.NewIDSet()

internal/index/master_index_test.go

@@ -342,7 +342,7 @@ var (
 )
 
 func createFilledRepo(t testing.TB, snapshots int, version uint) restic.Repository {
-	repo := repository.TestRepositoryWithVersion(t, version)
+	repo, _ := repository.TestRepositoryWithVersion(t, version)
 
 	for i := 0; i < snapshots; i++ {
 		restic.TestCreateSnapshot(t, repo, snapshotTime.Add(time.Duration(i)*time.Second), depth)