turbo

0efbe300 - test: Add regression tests and `OutputWatcher` trait to prepare for daemon removal from `turbo watch` (#12171)

test: Add regression tests and `OutputWatcher` trait to prepare for daemon removal from `turbo watch` (#12171) ## Summary - Defines the `OutputWatcher` trait that will replace `DaemonClient` in `RunCache`/`TaskCache` when we remove the daemon from watch mode - Adds regression tests that characterize current watch behavior and must stay green throughout the daemon removal refactor ## What's here **`OutputWatcher` trait** (`turborepo-run-cache`): Abstracts `get_changed_outputs` and `notify_outputs_written` — the two operations `TaskCache` uses to prevent infinite rebuild loops in watch mode. Currently these go through the daemon's gRPC interface; the trait lets us swap in an in-process `GlobWatcher` without changing `TaskCache`. **8 mock-based unit tests** (`turborepo-run-cache`): Characterize the trait contract — empty results, partial changes, error recovery for both get and notify, lifecycle round-trips, per-hash independence, and `Send + Sync` compliance. **3 GlobWatcher delegation tests** (`turborepo-filewatch`): Verify that `GlobWatcher::watch_globs`/`get_changed_globs` satisfy the `OutputWatcher` contract when called with raw strings and `GlobSet::from_raw` — the exact path the future `InProcessOutputWatcher` will use. Tests cover unchanged outputs, changed outputs, and exclusion glob handling. **2 E2E watch tests** (`watch_test.rs`): - `watch_no_spurious_rebuild_after_settle` — After the initial build, no further rebuilds occur when no files change. Guards against infinite rebuild loops from cache restores triggering the file watcher. - `watch_same_content_write_does_not_rebuild` — Writing identical content to a source file does not trigger a rebuild. Guards against hash-based deduplication regression. ## Testing All 13 new tests pass locally. The 2 E2E tests are automatically serialized via the existing nextest `turbo-watch-serial` group.