package dryrun_test import ( "context" "fmt" "io" "sort" "strings" "testing" "github.com/restic/restic/internal/backend" "github.com/restic/restic/internal/backend/dryrun" "github.com/restic/restic/internal/backend/mem" ) // make sure that Backend implements backend.Backend var _ backend.Backend = &dryrun.Backend{} func newBackends() (*dryrun.Backend, backend.Backend) { m := mem.New() return dryrun.New(m), m } func TestDry(t *testing.T) { ctx := context.TODO() d, m := newBackends() // Since the dry backend is a mostly write-only overlay, the standard backend test suite // won't pass. Instead, perform a series of operations over the backend, testing the state // at each step. steps := []struct { be backend.Backend op string fname string content string wantErr string }{ {d, "delete", "", "", ""}, {d, "stat", "a", "", "not found"}, {d, "list", "", "", ""}, {m, "save", "a", "baz", ""}, // save a directly to the mem backend {d, "save", "b", "foob", ""}, // b is not saved {d, "save", "b", "xxx", ""}, // no error as b is not saved {d, "stat", "a", "a 3", ""}, {d, "load", "a", "baz", ""}, {d, "load", "b", "", "not found"}, {d, "list", "", "a", ""}, {d, "remove", "c", "", ""}, {d, "stat", "b", "", "not found"}, {d, "list", "", "a", ""}, {d, "remove", "a", "", ""}, // a is in fact not removed {d, "list", "", "a", ""}, {m, "remove", "a", "", ""}, // remove a from the mem backend {d, "list", "", "", ""}, {d, "close", "", "", ""}, {d, "close", "", "", ""}, } for i, step := range steps { var err error handle := backend.Handle{Type: backend.PackFile, Name: step.fname} switch step.op { case "save": err = step.be.Save(ctx, handle, backend.NewByteReader([]byte(step.content), step.be.Hasher())) case "list": fileList := []string{} err = step.be.List(ctx, backend.PackFile, func(fi backend.FileInfo) error { fileList = append(fileList, fi.Name) return nil }) sort.Strings(fileList) files := strings.Join(fileList, " ") if files != step.content { t.Errorf("%d. List = %q, want %q", i, files, step.content) } case "delete": err = step.be.Delete(ctx) case "remove": err = step.be.Remove(ctx, handle) case "stat": var fi backend.FileInfo fi, err = step.be.Stat(ctx, handle) if err == nil { fis := fmt.Sprintf("%s %d", fi.Name, fi.Size) if fis != step.content { t.Errorf("%d. Stat = %q, want %q", i, fis, step.content) } } case "load": data := "" err = step.be.Load(ctx, handle, 0, 0, func(rd io.Reader) error { buf, err := io.ReadAll(rd) data = string(buf) return err }) if data != step.content { t.Errorf("%d. Load = %q, want %q", i, data, step.content) } case "close": err = step.be.Close() default: t.Fatalf("%d. unknown step operation %q", i, step.op) } if step.wantErr != "" { if err == nil { t.Errorf("%d. %s error = nil, want %q", i, step.op, step.wantErr) } else if !strings.Contains(err.Error(), step.wantErr) { t.Errorf("%d. %s error = %q, doesn't contain %q", i, step.op, err, step.wantErr) } else if step.wantErr == "not found" && !step.be.IsNotExist(err) { t.Errorf("%d. IsNotExist(%s error) = false, want true", i, step.op) } } else if err != nil { t.Errorf("%d. %s error = %q, want nil", i, step.op, err) } } }