Preview tokens 1: Groundwork A (Testing)

[lukasbestle]

Description

Summary of changes

Ensure that all features of $page->render() are tested in one place

Reasoning

Provides a baseline to reduce the risk of regressions

Changelog

Housekeeping

• Refactor page render tests out into separate test class and extend them to cover more cases

Ready?

• In-code documentation (wherever needed)
• Unit tests for fixed bug/feature
• Tests and CI checks all pass

For review team

• Add lab and/or sandbox examples (wherever helpful)
• Add changes & docs to release notes draft in Notion

[distantnative]

Suggestion: Could we add a comment to the PageCacheTest class that now the tests for the caching in the render method can be found in the PageRenderTest class? Might help us down the road to remember/understand where to find what.

[bastianallgeier]

The test improvements are really great.