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config.sh
The installer had three sites touching FILESYSTEM: a top-level default in the monolith, a re-default block in gather_input, and a runtime validation block also in gather_input. The same scattering existed for LOCALE, KEYMAP, ENABLE_SSH, and NO_ENCRYPT. A future contributor changing one site wouldn't have known the other two existed.
Move all five defaults into the lib/config.sh declarations so config.sh is the single source of truth. Add validate_filesystem() in lib/config.sh and call it from main() between check_config and gather_input, so a typo in a config file's FILESYSTEM= fails fast before any install action runs.
The behavior change is stricter. An empty FILESYSTEM in a config file used to be silently defaulted to zfs, now it errors. Interactive mode is unaffected. select_filesystem still controls the value and already errored on cancellation.
Bats: 140 → 142. Five tests added in test_config.bats for the defaults pinning and validate_filesystem coverage. Three removed from test_archangel.bats for behavior that moved out of gather_input. Lint clean.
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Added unit tests for `disk.sh`, `btrfs.sh`, the archangel monolith's `gather_input` unattended branch, and filled gap cases in `config.sh`. The suite grew from 71 to 110 tests.
`installer/lib/disk.sh` was completely uncovered. New `tests/unit/test_disk.bats` covers the four pure partition-path helpers (`get_efi_partition`, `get_root_partition`, `get_efi_partitions`, `get_root_partitions`) across SATA, virtio, and NVMe inputs, mixed arrays, and the empty-input behavior. Side-effecting functions in the same file (sgdisk, mkfs.fat, partprobe, and fzf wrappers) stay deliberately VM-tested.
`installer/lib/btrfs.sh` had no bats coverage. New `tests/unit/test_btrfs.bats` covers `get_luks_devices`, the only pure helper in the file. It pins the asymmetric naming convention where the first device gets the bare `LUKS_MAPPER_NAME` and subsequent devices append the index.
The archangel monolith was un-source-able for tests because its top-level code created a /tmp log file and redirected stdout via `exec > >(tee...)`, plus called `main "$@"` unconditionally at the bottom. I extracted the logging setup into an `init_logging` function called from `main`, and wrapped the main call in a `[[ "${BASH_SOURCE[0]}" == "${0}" ]]` guard. Sourcing the script now loads function definitions silently, with no log file and no banner. Running it directly works exactly as before. Verified both paths.
That refactor unlocks `tests/unit/test_archangel.bats`, which covers `gather_input` in unattended mode. Required-field validation for HOSTNAME, TIMEZONE, ROOT_PASSWORD, and DISKS. Optional-field defaulting (FILESYSTEM to zfs, LOCALE to en_US.UTF-8, KEYMAP to us, ENABLE_SSH to yes). Filesystem-specific encryption checks (ZFS_PASSPHRASE required when not NO_ENCRYPT, same for LUKS_PASSPHRASE on Btrfs). Filesystem validity. RAID_LEVEL defaulting for multi-disk installs. The interactive branch stays out of scope per the testing-strategy policy.
`tests/unit/test_config.bats` got five gap tests: `check_config` when CONFIG_FILE is set, `validate_config` against a non-block-device entry (e.g. /dev/null) and a missing path, and `parse_args` accepting `--color` and `--config-file` together in either order.
`testing-strategy.org` got an expanded "What bats does NOT cover" section. The doc previously named six tools (mkfs, cryptsetup, zpool create, pacstrap, arch-chroot, grub-install). The new list adds sgdisk, partprobe, blkid, mkfs.fat, mkfs.btrfs, snapper, efibootmgr, mount, umount, findmnt, mountpoint, and fzf. It also names the conditions (root needed, real /dev or /sys state) that make a function VM-only. The coverage table at the top now lists the three new test files.
No behavior change in production code. The init_logging extraction preserves the existing log path and banner format byte-for-byte.
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23 bats tests covering the pure logic in installer/lib/common.sh
(command_exists, require_command, info/warn/error, enable_color,
require_root, log) and installer/lib/config.sh (parse_args, load_config,
validate_config, check_config). Makefile adds a 'bats' target; 'test'
now runs lint + bats (VM integration tests remain under test-install).
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