| 67 | } |
| 68 | |
| 69 | func TestRollbackOnProgramError(t *testing.T) { |
| 70 | t.Parallel() |
| 71 | type DB struct{ Val int } |
| 72 | |
| 73 | path := filepath.Join(t.TempDir(), "testrollback.json") |
| 74 | db, err := New[DB](path) |
| 75 | if err != nil { |
| 76 | t.Fatal(err) |
| 77 | } |
| 78 | |
| 79 | mustWrite(t, db, func(db *DB) { db.Val = 3 }) |
| 80 | mustWrite(t, db, func(db *DB) { db.Val = 1 }) |
| 81 | |
| 82 | var rollbackErr = fmt.Errorf("rollback") |
| 83 | if err := db.Write(func(db *DB) error { |
| 84 | db.Val = 2 |
| 85 | return rollbackErr |
| 86 | }); err == nil || !errors.Is(err, rollbackErr) { |
| 87 | t.Fatalf("Write err=%v, want %v", err, rollbackErr) |
| 88 | } |
| 89 | |
| 90 | db.Read(func(db *DB) { |
| 91 | if db.Val != 1 { |
| 92 | t.Fatalf("Val = %d after rollback, want 1", db.Val) |
| 93 | } |
| 94 | }) |
| 95 | } |
| 96 | |
| 97 | func TestFileError(t *testing.T) { |
| 98 | t.Parallel() |