test: add coverage for fetchLatestVersion and versionExists

[BYK]

Summary

• Add tests for fetchLatestVersion() - tests routing logic for all installation methods (curl, npm, pnpm, bun, yarn, unknown)
• Add tests for versionExists() - tests version existence checking for curl (GitHub) and package manager (npm) methods

Changes

• +143 lines in test/lib/upgrade.test.ts
• +15 tests (from 18 to 33 total)

Test Coverage

Function	Tests Added
fetchLatestVersion	6 (one per installation method)
versionExists	9 (exists/not-exists for curl and npm, plus pnpm/bun/yarn, plus network error handling)

These tests improve coverage for src/lib/upgrade.ts which was at 40.23%.

[github-actions]

Semver Impact of This PR

⚪ None (no version bump detected)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

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New Features ✨

Dsn

• Infer project from directory name when DSN detection fails by BYK in #178
• Add project root detection for automatic DSN discovery by BYK in #159

Other

• (issue) Replace --org/--project flags with /ID syntax by BYK in #161
• (lib) Add anyTrue helper for parallel-with-early-exit pattern by BYK in #174
• (telemetry) Add withTracing helper to reduce Sentry span boilerplate by BYK in #172

Bug Fixes 🐛

• (types) Align schema types with Sentry API by betegon in #169
• ParseIssueArg now checks slashes before dashes by BYK in #177
• Address bugbot review comments on dsn-cache model-based tests by BYK in #176
• Added nullable in substatus's zod validation by MathurAditya724 in #157

Internal Changes 🔧

• (upgrade) Use centralized user-agent for GitHub API requests by BYK in #173

Other

• test: add coverage for fetchLatestVersion and versionExists by BYK in #189

• test: add coverage for UpgradeError and SeerError classes by BYK in #188
• test: add property tests for sentry-urls.ts (Phase 3) by BYK in #186
• test: simplify issue-id tests covered by property tests by BYK in #183
• test: simplify alias and arg-parsing tests covered by property tests by BYK in #182
• test: add property tests for API command and human formatters by BYK in #181
• test: remove redundant DB tests covered by model-based tests by BYK in #180
• test: add property tests for async utilities (Phase 4) by BYK in #179
• test: add model-based tests for DSN and project cache by BYK in #171
• test: add model-based and property-based testing with fast-check by BYK in #166

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[github-actions]

Codecov Results 📊

✅ Patch coverage is 100.00%. Project has 2254 uncovered lines.
✅ Project coverage is 70.32%. Comparing base (base) to head (head).

Files with missing lines (32)

File	Patch %	Lines
human.ts	31.80%	⚠️ 684 Missing
resolve-target.ts	15.28%	⚠️ 366 Missing
oauth.ts	25.10%	⚠️ 194 Missing
api-client.ts	73.67%	⚠️ 148 Missing
upgrade.ts	42.97%	⚠️ 146 Missing
resolver.ts	3.23%	⚠️ 120 Missing
errors.ts	5.94%	⚠️ 95 Missing
migration.ts	47.44%	⚠️ 82 Missing
version-check.ts	34.04%	⚠️ 62 Missing
telemetry.ts	77.43%	⚠️ 51 Missing
api.ts	89.80%	⚠️ 47 Missing
seer.ts	75.54%	⚠️ 45 Missing
preload.ts	38.71%	⚠️ 38 Missing
seer.ts	79.87%	⚠️ 30 Missing
schema.ts	52.73%	⚠️ 26 Missing
utils.ts	87.43%	⚠️ 24 Missing
detector.ts	90.10%	⚠️ 20 Missing
code-scanner.ts	95.00%	⚠️ 16 Missing
dsn-cache.ts	94.62%	⚠️ 12 Missing
fs-utils.ts	57.14%	⚠️ 9 Missing
project-root.ts	97.73%	⚠️ 7 Missing
feedback.ts	84.21%	⚠️ 6 Missing
auth.ts	95.52%	⚠️ 6 Missing
upgrade.ts	93.83%	⚠️ 5 Missing
colors.ts	91.84%	⚠️ 4 Missing
env-file.ts	97.58%	⚠️ 3 Missing
project-aliases.ts	97.40%	⚠️ 2 Missing
project-root-cache.ts	96.92%	⚠️ 2 Missing
alias.ts	99.28%	⚠️ 1 Missing
parser.ts	98.63%	⚠️ 1 Missing
helpers.ts	94.74%	⚠️ 1 Missing
helpers.ts	94.74%	⚠️ 1 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    70.23%    70.32%    +0.09%
==========================================
  Files           55        55         —
  Lines         7595      7595         —
  Branches         0         0         —
==========================================
+ Hits          5334      5341        +7
- Misses        2261      2254        -7
- Partials         0         0         —

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