Do we know when we began to see this bug? Around the date this was reported, late September 2023?

In the code (WikiLambda/resources/ext.wikilambda.edit/components/function/viewer/FunctionViewerDetails.vue) where this test data would get initialized, I see mention of this task commented, 'TODO (T310003): fetch these from a cached table in mediawiki'. Perhaps this is not a bug, rather a non-trivial task and we are intentionally using '-' for the time being 🤔 ? @Jdforrester-WMF do you recall/have thoughts?

Ok and linked task says it's a dupe of this one which apparently says is resolved 😅 .

T310003 is indeed done via T297707 – we cache the results in the wikilambda_ztester_results table, which we access via the ZObjectStore::findZTesterResult() method in PHP (which the API calls). I think that's unrelated to this bug.

In the zTesterResults.js store module there's a getter called getZTesterPercentage which takes an implementation zid and returns an object such as this:

{
  passing: 3,
  total: 5,
  percentage: 60
}

This getter can be used from the implementationsBody loop to create the "passing/total" for each row.

Change 1008963 had a related patch set uploaded (by Ecarg; author: Ecarg):

[mediawiki/extensions/WikiLambda@master] Implementation Table should show test results

https://gerrit.wikimedia.org/r/1008963

Change 1008963 merged by jenkins-bot:

[mediawiki/extensions/WikiLambda@master] Implementation Table should show test results

https://gerrit.wikimedia.org/r/1008963