test(renderer): add unit tests for getGlassFilterDefs function

[miccy]

Summary by CodeRabbit

• Tests
  • Expanded coverage for glass theme rendering.
  • Added validation for default and custom blur, opacity, gradient, and definition wrapper output.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between e587e06 and 393563b.

📒 Files selected for processing (1)

• packages/renderer/src/themes.test.ts

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📝 Walkthrough

Walkthrough

The renderer test suite now checks <defs> wrappers and opacity for the default glass theme. It also verifies that custom blur, opacity, and gradient values appear in generated filter definitions.

Changes

Glass filter test coverage

Layer / File(s)	Summary
Validate glass filter output packages/renderer/src/themes.test.ts	The default-theme test checks <defs> boundaries and opacity. A new custom GlassTheme test checks dynamic blur, opacity, and gradient output.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 39356

This localized test-only change introduces no actionable merge-blocking risk and is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the added unit tests for getGlassFilterDefs.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test-get-glass-filter-defs-10829000203038379865

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