# Test fixtures

These are **synthetic** SEGA fscrypt containers used by `tests/e2e.rs`. They
contain only dummy files (a few text/XML/stub binaries), so they are safe to
commit — there is no proprietary game content inside.

| File | Type | What it exercises |
|------|------|-------------------|
| `TEST_T001_20240101120000_0.opt` | OPTION | exFAT decrypt + extract (built-in OPTION key) |
| `TEST_1.00.00_20240101120000_0.app` | APP (base) | outer NTFS → `internal_0.vhd` (fixed VHD) → inner NTFS extract |
| `TEST_1.01.00_20240102120000_1_1.00.00.app` | APP (delta) | differencing `internal_1.vhd`, auto-merged against the base by VHD GUID |
| `TEST.bin` | key | external key (16-byte key + 16-byte IV) for game id `TEST` |

The delta is a real differencing VHD linked to the base; decrypting it (with the
base alongside) merges the two and yields the base files plus the delta's added
`data/patch_notes.txt` and a modified `readme.txt`.

The `.app` fixtures use the synthetic game id `TEST`, which is **not** in the
built-in key table — so they are decrypted via the external-key-file fallback
using the committed `TEST.bin` (this also exercises that fallback path).
`tests/e2e.rs` copies `TEST.bin` next to the containers and runs from there so
the binary finds it. The OPTION fixture uses the built-in OPTION key. Everything
here — keys and filesystem data alike — is synthetic.

You can also drop your own **real** `.app`/`.opt` files in this folder to test
against them; everything here except these committed fixtures is git-ignored.

## Regenerating

These are generated by a local, uncommitted script set (NTFS/exFAT image
creation in Docker + a small SEGA fscrypt packer adapted from
[`beerpsi/x`](https://gitea.tendokyu.moe/beerpsi/x)). The byte output is not
reproducible (NTFS/exFAT embed creation timestamps), but regenerated fixtures are
functionally equivalent.