test: collapse test/isolated/ into test/lib and test/commands

[BYK]

Follow-up to #839. With bun test --isolate giving each file a fresh module graph, the test/isolated/ split that existed to work around mock.module() registry pollution (oven-sh/cli#258) is no longer needed.

Merged into existing files

Per-feature tests now live with their natural counterparts:

From	To
isolated/brew-upgrade.test.ts	test/lib/upgrade.test.ts
isolated/log-view-prompt.test.ts	test/commands/log/view.test.ts
isolated/login-reauth.test.ts	test/commands/auth/login.test.ts
isolated/project-delete-confirm.test.ts	test/commands/project/delete.test.ts
isolated/set-commits-auto.test.ts	test/lib/api/releases.test.ts
isolated/set-commits-auto-no-remote.test.ts	test/lib/api/releases.test.ts (merged together — getRepositoryName is now a controllable mock())
isolated/dsn/project-root.test.ts	test/lib/dsn/project-root.test.ts

Pattern: mock.module() at the top of the merged file, followed by a dynamic await import() for the code under test so the mocked bindings win. Other static imports stay as-is.

Also unblocks the previously-deferred stub in test/lib/api/releases.test.ts that said "setCommitsAuto tests live in test/isolated/ because they require mock.module() for git helpers".

Moved as sibling files

Two isolated files tested the same subjects as existing files but with incompatible mocking strategies. Under --isolate they coexist safely as siblings:

From	To
isolated/resolve-target.test.ts	test/lib/resolve-target.mocked.test.ts
isolated/delta-upgrade.test.ts	test/lib/delta-upgrade.mocked.test.ts

The existing resolve-target.test.ts and delta-upgrade.test.ts use real DB + mocked fetch; the .mocked. siblings stub every collaborator via mock.module().

New files (no prior counterpart)

Three isolated DSN helpers had no target file in test/lib/dsn/:

• isolated/dsn/errors.test.ts → test/lib/dsn/errors.test.ts
• isolated/dsn/fs-utils.test.ts → test/lib/dsn/fs-utils.test.ts
• isolated/dsn/resolver.test.ts → test/lib/dsn/resolver.test.ts

Removed scopedFetchMock helper

test/lib/sentry-client.test.ts previously wrapped all its fetch mocks with scopedFetchMock(marker, handler) to filter out foreign fetch calls that leaked from other test files (CI run 24835339085). Under bun test --isolate each file gets a fresh globalThis.fetch, so cross-file leakage is eliminated. The 6 call sites now use mockFetch() directly; the helper and its urlOf() dependency are gone (~30 lines).

Other cleanups

• Removed test/isolated/ directory
• Updated package.json test:unit to drop test/isolated from the argument list
• test/lib/dsn/project-root.test.ts: noopSpan stub now includes setAttributes (production code calls both setAttribute and setAttributes)
• Replaced () => {} test stubs with named noop functions to satisfy lint/suspicious/noEmptyBlockStatements without per-line biome-ignore comments

Verification

• ✅ bun run test:unit — 5920 pass / 0 fail across 253 files (was 260 — merges consolidated 12 files into 5 new + 7 existing)
• ✅ 3 consecutive stress runs clean
• ✅ bun run typecheck, bun run lint

Net diff: +1219 / −3830 (most "deletions" are file moves; real code reduction is the scopedFetchMock removal plus deduplication from merging).

[github-actions]

Codecov Results 📊

✅ 5920 passed | Total: 5920 | Pass Rate: 100% | Execution Time: 0ms

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	—
Failed Tests	—
Skipped Tests	—

✨ No test changes detected

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 13025 uncovered lines.
✅ Project coverage is 75.16%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    75.10%    75.16%    +0.06%
==========================================
  Files          284       284         —
  Lines        52482     52437       -45
  Branches         0         0         —
==========================================
+ Hits         39412     39412         —
- Misses       13070     13025       -45
- Partials         0         0         —

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