• Maintainability | apps/oxfmt/test/init.test.ts:7-12
fs.mkdtemp() expects a prefix, and it will append random characters to it. By removing the trailing - (and similarly in the new migrate tests), you reduce readability and make it harder to visually spot the random suffix. More importantly, using a prefix without a delimiter can be confusing when scanning temp directories.

This is also repeated across multiple tests; keeping a consistent pattern helps when debugging CI artifacts locally.

• Readability | apps/oxfmt/test/init.test.ts:46-56
  The old init tests explicitly asserted the error message on failure (e.g. stderr contains "Oxfmt configuration file already exists."). The updated test only checks exitCode === 1, which reduces the value of the test: regressions that still exit non-zero but emit a wrong/empty message won’t be caught.

Since this is CLI behavior, verifying both exit code and a key portion of stderr is important.

• Maintainability | apps/oxfmt/test/init.test.ts:45-56
  This test case was removed, but the CLI behavior likely still needs to be validated: previously you asserted that --init aborts when .oxfmtrc.jsonc already exists.

If the product behavior is still intended to guard against both .json and .jsonc, dropping the test reduces coverage and can allow a regression where --init overwrites or ignores an existing JSONC config.

• Maintainability | apps/oxfmt/src-js/migration/migrate-prettier.ts:66-66
  The migration script now prints indented bullet lines to stderr for skipped options. There are no tests asserting on these messages (fine), but the change does create a subtle UX inconsistency: other messages in this function use console.log(...) (stdout) while these use console.error(...) (stderr). If the intent is “progress output”, stderr can make piping/automation noisier.

If the intent is specifically to warn, consider making that explicit (or standardizing where warnings go) so downstream tools can reliably parse stdout.

Summary

This PR updates Oxfmt CLI tests and tweaks migration logging:

• apps/oxfmt/src-js/migration/migrate-prettier.ts

  • Adjusts console.error(...) messages for skipped/unsupported Prettier options to include an indented bullet prefix (" - ...").

• apps/oxfmt/test/init.test.ts

  • Renames the suite from init to --init.
  • Simplifies assertions by reading/parsing .oxfmtrc.json inline.
  • Reorders setup for the $schema test.
  • Removes the separate .oxfmtrc.jsonc already exists test and narrows the remaining “already exists” coverage.

• apps/oxfmt/test/migrate_prettier.test.ts (new)

  • Adds coverage for --migrate prettier:
    • Creates .oxfmtrc.json when no Prettier config exists.
    • Aborts when .oxfmtrc.json exists.
    • Migrates .prettierrc options.
    • Defaults printWidth to 80 when missing.
    • Migrates .prettierignore into ignorePatterns.