Add tests for base64 and component-title utils

[esphbot]

What does this implement/fix?

Adds unit tests for the two remaining genuinely-untested pure utils:
arrayBufferToBase64 (src/util/base64.ts) and
stripRedundantComponentSuffix (src/util/component-title.ts). Both ship
behaviour with non-obvious edges and had zero coverage.

• arrayBufferToBase64 chunks at 0x8000 and joins once to stay linear — the
  chunk seam is exactly the kind of thing a refactor can silently break. Tests
  cover a known vector (foo → Zm9v), the empty buffer, a full 0-255 byte
  round-trip, and round-trips both across and exactly on the 0x8000 boundary.
• stripRedundantComponentSuffix has an empty-result guard (" Component" →
  original, not "") and is intentionally anchored + case-sensitive. Tests
  cover suffix trimming, the empty-result guard, anchored-at-end matching, and
  case sensitivity. The util is purely textual (the core-only policy lives in
  the caller), so "Copy Component" is still trimmed here.

Related issue or feature (if applicable):

• N/A

Types of changes

• Bugfix (non-breaking change which fixes an issue) — bugfix
• New feature (non-breaking change which adds functionality) — new-feature
• Enhancement to an existing feature — enhancement
• Breaking change (fix or feature that would cause existing functionality to not work as expected) — breaking-change
• Refactor (no behaviour change) — refactor
• Documentation only — docs
• Maintenance / chore — maintenance
• CI / workflow change — ci
• Dependencies bump — dependencies

Checklist

• The code change is tested and works locally.
• npm run lint passes.
• npm run test passes.
• Tests have been added to verify that the new code works (where applicable).

[bdraco]

You must use the pr template, do not mangle it

[bdraco]

@esphbot rr

[esphbot]

PR Review — Add tests for base64 and component-title utils

Tests are correct and well-targeted; the blocker is the PR body, not the code.

The two test files are accurate against their sources. arrayBufferToBase64 chunks at 0x8000 and the suite deliberately exercises both a buffer crossing the seam (0x8000 + 5) and one landing exactly on a multiple (0x8000 * 2) — the right edges for a chunked encoder. stripRedundantComponentSuffix coverage matches the regex / (Component|Configuration)$/ exactly: the " Component" -> " Component" empty-result guard, the leading-space requirement, anchored-at-end, and case sensitivity are all real edges of that one-liner. The "Copy Component" case correctly documents that the util is purely textual and the core-only policy lives in the caller. btoa/atob are global in the Node vitest env, so the round-trips run fine.

• BLOCKING: @bdraco requested changes — "use the pr template, do not mangle it." The description uses ad-hoc What/Why/How/Testing headers instead of .github/PULL_REQUEST_TEMPLATE.md (which expects "What does this implement/fix?", the related-issue block, the Types-of-changes list, and the Checklist). CI derives the label from the ticked Types-of-changes box; tick exactly one ("Maintenance / chore"). Rewrite the body on the template before re-requesting review.
• Quality report shows "Tests: failed (18 failed, 0 test)" — this matches the known @replit/codemirror-indentation-markers install drift on this workspace (whole suite fails to run), not a fault in these files. Confirm the two new files pass in clean CI; the local 13-passed claim is consistent with that.
• No correctness, security, or coverage issues in the added tests.

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Checklist

• Tests match source behavior
• Edge cases covered (empty, boundary, case sensitivity)
• No hardcoded secrets
• Test isolation (no shared/order-dependent state)
• PR follows template / passes maintainer review — summary blocker

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Automated review by Kōan (Claude) HEAD=a8a2e79 49s

[esphbot]

Simple rebase

Branch koan/test-base64-component-title was rebased onto main — no additional changes were needed.

Stats

2 files changed, 90 insertions(+)

Actions performed

• Already-solved check: negative (confidence=high, reasoning=No commit on main adds tests for arrayBufferToBase64 (base64.ts) or stripRedundantComponentSuffix (c)
• Rebased koan/test-base64-component-title onto upstream/main
• Pre-push CI check: previous run #27526515455 failed
• Pre-push CI fix: no changes needed or Claude found nothing to fix
• Force-pushed koan/test-base64-component-title to origin
• CI check enqueued in ## CI (async)

CI status

CI will be checked asynchronously.

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Automated by Kōan

[Copilot]

Pull request overview

This PR adds unit tests for two previously untested pure utility functions (arrayBufferToBase64 and stripRedundantComponentSuffix) to lock in behavior around chunking boundaries and suffix-trimming edge cases.

Changes:

• Add coverage for arrayBufferToBase64, including empty input, known vectors, full byte-range round-trip, and 0x8000 chunk seam cases.
• Add coverage for stripRedundantComponentSuffix, including anchored suffix trimming, empty-result guard, and case-sensitivity.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
test/util/component-title.test.ts	Adds unit tests for suffix stripping behavior and edge cases.
test/util/base64.test.ts	Adds unit tests for base64 encoding correctness and chunk-boundary round-trips.