tests : Add tests for CoreList block.

[Ta5r]

Tracking wpengine#298

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What:

This PR backfills tests for the Core List and Core List Item block and their attributes.

Tested attributes:

CoreListAttributes

• anchor
• backgroundColor
• className
• cssClassName
• fontFamily
• fontSize
• gradient
• lock
• ordered
• placeholder
• reversed
• start
• style
• textColor
• type
• values

CoreListItemAttributes

• className
• content
• fontFamily
• fontSize
• lock
• style

Untested fields:

• CoreListAttributes.metadata - @todo

Exposed issues:

• CoreListAttributes.cssClassNames - This is not working in the tests.

These issues are noted in comments within the test file and should be addressed in future updates.

[justlevine]

See #24 (review)

[justlevine]

Looks great!

CoreListItem.parentClientId - This is is null in the response.

It's null when editorBlocks arent flat. To cover this, add a new test with a minimal $query (of just the clientId + parent Client Ids on the list + listItem and compare.

Once that and the minimal comments are handled (and we take a stab at the b/c compatibility issue on WP 6.1) this should be good to merge.

To handle WP 6.1 failing, see the [slack instructions[(https://rtcamp.slack.com/archives/CK2CEH4F6/p1727126999500269?thread_ts=1726011552.525109&cid=CK2CEH4F6)

[justlevine]

@tanay in 3972c4a I simplified things, and ensured we're only gating the b/c stuff instead of all the list item props.

Go ahead and open a PR upstream 🚀