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## Summary Six test files wrote into the shared temp dir on every normal run and never removed what they wrote. **Desktop and buzz-agent (first commit)** - `desktop/src/protectedFeatures/tauriCommand.test.mjs` wrote its fake Tauri CLI and three result files straight into `/tmp` under pid-suffixed names. They now live under one `mkdtempSync` root that an `after()` hook removes. - `crates/buzz-agent/tests/permission_boundary.rs` wrote a `buzz_perm_calllog_*` file for every test whose tool call reached `fake_mcp`, five per run. `call_log_path` now returns a `TempDir` guard with the log path inside it, so the log is deleted when the test ends, including when an assertion panics. - `cancel_kills_inflight_tool_via_mcp_notification` in `crates/buzz-agent/tests/regressions.rs` spawns `buzz-dev-mcp`, which the agent stops with SIGKILL, so the server's `buzz-dev-mcp-*` and `buzz-dev-mcp-session-*` TempDirs were never deleted. The test now passes the server a `TMPDIR` it owns and removes. **Mobile (second commit)** The three mobile test files left 12 `buzz-video-*` files and 4 `transcode_*` dirs per run. - `video_viewer_test.dart` and `video_controls_test.dart` pointed their fake `path_provider` at `Directory.systemTemp`. The viewer downloads each video there as `buzz-video-*`, and its async delete on close never completes under FakeAsync. Each test now gets its own temp dir for the fake, and an `addTearDown` removes it with `deleteSync`. In `video_controls_test.dart` that teardown is registered first, so it runs after the viewer is disposed. - Four `media_upload_test.dart` tests faked `transcodeVideoToMp4` by writing `out.mp4` into a new `systemTemp` `transcode_*` dir. The upload service deletes `out.mp4` but not its dir. The fakes now create that dir under the test's own temp root, which the test already deletes in `finally`. Production code is unchanged. **`buzz-dev-mcp`'s SIGKILL shutdown is left for a follow-up:** the agent still stops the server with SIGKILL, so outside tests the server's temp dirs are still left behind. Sending SIGTERM first is the real fix. ### Related issue None found. This continues the test-cleanup work in #8727. ### Testing Each run below was bracketed by listings of `/tmp` and the per-user temp dir (`/var/folders/.../T`), so new leftovers would show up. - `tauriCommand.test.mjs`: 3/3 pass, with no new `buzz-tauri-*` or `buzz-fake-tauri-*` entries. - `cargo test -p buzz-agent --test permission_boundary`: 9/9 pass, with no new `buzz_perm_calllog_*` files. The tests still check that the call log is written, so the log really is going into the guarded dir. - `cancel_kills_inflight_tool_via_mcp_notification` passes with `buzz-dev-mcp` built, so it ran rather than skipped, and left no new `buzz-dev-mcp-*` dirs. - Mobile: `video_viewer_test` (7 tests), `video_controls_test` (20) and `media_upload_test` (38) pass, each run on its own. With `TMPDIR` pointed at a scratch dir, the old versions left 12 `buzz-video-*` files and 4 `transcode_*` dirs, and the new versions left it empty. - After cherry-picking onto current main, these pass: - `cargo clippy -p buzz-agent --all-targets -- -D warnings` - biome and `node --check` on `tauriCommand.test.mjs` - `dart format` and `flutter analyze` on the three mobile files 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: Matt Toohey <contact@matttoohey.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>