Better test coverage for core

[andretchen0]

Description

As a developer trying to respond to issues filed against the TresJS core, I would like to have a more significant portion of /src/core/nodeOps.ts covered by unit tests.

This will allow us to respond more quickly to issues filed against the core, and to modify the core with more confidence and fewer regressions.

Here's where pnpm coverage puts us currently.

File                                    | % Stmts | % Branch | % Funcs | % Lines |
  nodeOps.ts                            |   48.49 |    37.14 |   26.66 |   48.49 |

Suggested solution

Improve test coverage of core functionality.

Alternative

No response

Additional context

No response

Validations

• [X] I agree to follow this project's Code of Conduct
• [X] Read the Contributing Guidelines.
• [X] Read the docs.
• [X] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.