test(ParticleRenderer): add unit test case of `ParticleRenderer`

[jtabibito]

Please check if the PR fulfills these requirements

• [ ] The commit message follows our guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

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Summary by CodeRabbit

• Tests
  • Introduced a comprehensive suite of unit tests for the ParticleRenderer component, enhancing reliability and stability within the rendering system.
  • Validated properties such as lengthScale, velocityScale, and renderMode, ensuring correct behavior across various inputs and error handling.

[coderabbitai[bot]]

Walkthrough

The changes introduce a comprehensive unit test suite for the ParticleRenderer component in the Galacean engine. Utilizing Mocha's syntax, the tests cover key properties, including lengthScale, velocityScale, and renderMode, validating their behavior with various inputs. Additionally, reference counting for the mesh property is thoroughly tested. This enhancement ensures the robustness of the ParticleRenderer, contributing to the stability and reliability of the rendering system.

Changes

Files	Change Summary
tests/src/core/particle/ParticleRenderer.test.ts	Added a suite of unit tests for the ParticleRenderer component, covering properties and reference counting.

Poem

In the engine’s heart, the particles dance,
With tests in place, they twirl and prance.
Lengths and velocities, all put to the test,
Ensuring our renderer performs at its best!
A hop, a skip, through code they gleam,
Reliable, robust—what a glorious dream! 🐰✨

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[JujieX]

Could we change the title to case of ParticleRenderer mainModule to be more accurate?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 66.83%. Comparing base (f95455f) to head (a357863). Report is 8 commits behind head on dev/1.4.

Additional details and impacted files

@@             Coverage Diff             @@
##           dev/1.4    #2285      +/-   ##
===========================================
- Coverage    67.09%   66.83%   -0.27%     
===========================================
  Files          895      895              
  Lines        92094    92100       +6     
  Branches      7274     7323      +49     
===========================================
- Hits         61795    61552     -243     
- Misses       30054    30303     +249     
  Partials       245      245              

Flag	Coverage Δ
unittests	66.83% <100.00%> (-0.27%)	:arrow_down:

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